October 23, 2020 NHTSA CAMPAIGN NUMBER: 20V651000
Damaged Power Steering Control Unit Wiring Harness
A loss of power steering assist can increase the risk of a crash. Additionally, If the wiring harness short-circuits, there is an increased risk of a fire.
NHTSA Campaign Number: 20V651
Manufacturer Mercedes-Benz
USA, LLC.
Components STEERING
Potential Number of Units Affected 2,535
Summary
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2020 GLC300, GLC350e, GLC43 AMG, and GLC63 AMG vehicles. The power steering control unit wiring harness may have been damaged during the production process, possibly resulting in a loss of power steering assist or an electrical short-circuit.
Remedy
MBUSA will notify owners, and dealers will inspect the wiring harness, and replace it if necessary, free of charge. The recall began December 11, 2020. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA’s number for this recall is 2020110012.
Notes
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.
Check if your Mercedes-Benz has a Recall
| TO: Mercedes-Benz Dealer Principals, General Managers, Sales Managers, Service Managers, Parts Managers | FROM: Gregory Gunther, Department Manager, Vehicle Compliance and Analysis, Engineering Services |
| RE: Recall Campaign Initial Notification Replace Steering Control Unit Wiring Harness Insulation MY20 253 (GLC-Class) | Date: October 30, 2020 |
IMPORTANT RECALL CAMPAIGN UPDATE
Please see the attached documents related to the campaign listed above.
Please note that all customer inquiries should be directed to the Customer Assistance Center at 1-800-FOR-MERCEDES.
Sincerely,
Gregory Gunther
Department Manager, Vehicle Compliance & Analysis
A Mercedes-Benz AG Company
| Campaign No. : | NHTSA ID | Campaign Desc. : | Replace Steering Control Unit Wiring Harness | |
| TBD | 20V651 | 20P2197308 | ||
| This is to notify you of a Recall Campaign launch regarding the steering control unit wiring harness insulation on 2,535 Model Year MY2020 253 (GLC-Class) vehicles. The recall campaign will be visible on the www.safercar.gov website and may generate questions from customers.
Affected VINs will be flagged in VMI as “PENDING” on October 30, 2020. | ||||
| Background | ||||
| Issue | Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain Model Year (“MY”) 2020 GLC-Class (253 platform) vehicles, the power steering control unit wiring harness might have been damaged during the production process. A damaged wiring harness could lead to moisture ingress into the wiring harness and/or the power steering control unit, resulting in a loss of the power steering assist, which could increase the risk of a crash. In addition, a damaged wiring harness could result in a short circuit, which could increase the risk of a fire. | |||
| What We’re Doing | MBUSA will conduct a voluntary recall. An authorized Mercedes-Benz dealer will check the steering control unit wiring harness on the affected vehicles and replace it, if necessary. | |||
| Parts | Remedy is not available at this time. An additional notification will be sent once the remedy is available. | |||
| Vehicles Affected | ||||
| Vehicle Model Year(s) | 2020 | |||
| Vehicle Model | GLC-Class | |||
| Vehicle Populations | ||||
| Total Recall Population | 2535 | |||
| Total Vehicles in Dealer Inventory | 38 | |||
| Given this notice, it is a violation of Federal law for a dealer to sell or lease any new MY20 GLC-Class vehicles in dealer inventory covered by this notification until the vehicle has been repaired. Once the remedy is available, the vehicles will be flagged as “OPEN” and Work Instructions will be available in Xentry. Once the repair is complete, the vehicle may be sold or leased.
Loaner and demonstrator vehicles may continue to be driven, but must not be retailed until repaired. As a matter of normal service process, please check for other repair measures which might be applicable to the vehicle(s)
Additionally, given this notice, it is a violation of Federal Law for car rental companies to rent new MY20 GLC-Class vehicles covered by this notification until the vehicle has been repaired. | ||||
| Next Steps/Notes | ||||
| Customer Notification Timeline | Customer letters will be mailed approximately one week after the remedy becomes available. | |||
| AOMS/SOMS | AOMs – This recall may generate questions from your dealers. Please forward this notice to your dealers ASAP. | |||
| Rental Fleet Partners | This recall may affect vehicles in your fleet. Please contact your respective MBUSA fleet representative for further information and next steps. For repairs, please contact your preferred MBUSA dealer. | |||
| While we regret any inconvenience this may cause, MBUSA is determined to maintain a high level of vehicle quality and customer satisfaction. Please refer all customer inquiries to the Customer Assistance Center at 1-800-FOR-MERCEDES. | ||||
A Mercedes-Benz AG Company
| TO: Mercedes-Benz Dealer Principals, General Managers, Sales Managers, Service Managers, Parts Managers | FROM: Gregory Gunther, Department Manager, Vehicle Compliance and Analysis, Engineering Services |
| RE: Recall Campaign Launch Notification Replace Steering Control Unit Wiring Harness MY20 253 (GLC-Class) | Date: December 08, 2020 |
IMPORTANT RECALL CAMPAIGN UPDATE
Please see the attached documents related to the campaign listed above.
Please note that all customer inquiries should be directed to the Customer Assistance Center at 1-800-FOR-MERCEDES.
Sincerely,
Gregory Gunther
Department Manager, Vehicle Compliance & Analysis
A Mercedes-Benz AG Company
| Campaign No. : | NHTSA ID | Campaign Desc. : | Replace Steering Control Unit Wiring Harness | |
| 2020110012 | 20V651 | 20P5491022 | ||
| This is to notify you of a Recall Campaign launch to replace the steering control unit wiring harness on 2,533 Model Year MY2020 253 (GLC-Class) vehicles. The recall campaign will be visible on the www.safercar.gov website and may generate questions from customers. Affected VINs will be flagged in VMI as “OPEN” on December 8, 2020. | ||||
| Background | ||||
| Issue | Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain Model Year (“MY”) 2020 GLC-Class (253 platform) vehicles, the power steering control unit wiring harness might have been damaged during the production process. A damaged wiring harness could lead to moisture ingress into the wiring harness and/or the power steering control unit, resulting in a loss of the power steering assist, which could increase the risk of a crash. In addition, a damaged wiring harness could result in a short circuit, which could increase the risk of a fire. | |||
| What We’re Doing | MBUSA will conduct a voluntary recall. An authorized Mercedes-Benz dealer will check the steering control unit wiring harness on the affected vehicles and replace it, if necessary. | |||
| Parts | The recall remedy is available and repairs can be performed as necessary. | |||
| Vehicles Affected | ||||
| Vehicle Model Year(s) | 2020 | |||
| Vehicle Model | GLC-Class | |||
| Vehicle Populations | ||||
| Total Recall Population | 2533 | |||
| Total Vehicles in Dealer Inventory | 19 | |||
| Given this notice, it is a violation of Federal law for a dealer to sell or lease any new MY20 GLC-Class vehicles in dealer inventory covered by this notification until the vehicle has been repaired. Once the remedy is available, the vehicles will be flagged as “OPEN” and Work Instructions will be available in Star TekInfo Once the repair is complete, the vehicle may be sold or leased.
Loaner and demonstrator vehicles may continue to be driven, but must not be retailed until repaired. As a matter of normal service process, please check for other repair measures which might be applicable to the vehicle(s)
Additionally, given this notice, it is a violation of Federal Law for car rental companies to rent new MY20 GLC-Class vehicles covered by this notification until the vehicle has been repaired.
| ||||
| Next Steps/Notes | ||||
| Customer Notification Timeline | Customer letters will be mailed on December 17, 2020, approximately one week after the remedy becomes available | |||
| AOMS/SOMS | AOMs – This recall may generate questions from your dealers. Please forward this notice to your dealers ASAP. | |||
| Rental Fleet Partners | This recall may affect vehicles in your fleet. Please contact your respective MBUSA fleet representative for further information and next steps. For repairs, please contact your preferred MBUSA dealer. | |||
| While we regret any inconvenience this may cause, MBUSA is determined to maintain a high level of vehicle quality and customer satisfaction. Please refer all customer inquiries to the Customer Assistance Center at 1-800-FOR-MERCEDES. | ||||
Campaign No. 2020110012, December 2020
Updated 1/2021
Updated 2/2021
| TO: | ALL MERCEDES-BENZ CENTERS |
| SUBJECT: | Model GLC-Class (253 platform) Model Year 2020 Replace Steering Control Unit Wiring Harness Insulation |
Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has determined that on certain Model Year (“MY”) 2020 GLC-Class (253 platform) vehicles, the power steering control unit wiring harness might have been damaged during the production process. A damaged wiring harness could lead to moisture ingress into the wiring harness and/or the power steering control unit, resulting in a loss of the power steering assist, which could increase the risk of a crash. In addition, a damaged wiring harness could result in a short circuit, which could increase the risk of a fire. An authorized Mercedes-Benz dealer will check the steering control unit wiring harness on the affected vehicles and replace it, if necessary.
Prior to performing this Recall Campaign:
- VMI must always be checked before performing campaigns to verify that the campaign is required on a specific vehicle. Always check for any other open campaigns, and perform accordingly.
- Please review the entire Recall Campaign bulletin and follow the repair procedure exactly as described.
Please note that Recall Campaigns do not expire and may also be performed on a vehicle with a vehicle status indicator.
Approximately 2533 vehicles are involved.
Order No. P-RC-2020110012
Mercedes-Benz Part 573 Submission
Original Submitted to Portal October 23, 2020
Chronology-Only section
Supplement to Original Submission
Chronology of Defect/Noncompliance Determination
In January 2020, MBAG launched initial investigations based on a finding on an internal vehicle that experienced a loss of the electric power steering assist. It was found that this vehicle had a damaged wiring harness which allowed moisture ingress into the wiring harness. The moisture subsequently entered into the steering control unit which resulted in the loss of the electric power steering assist. An analysis was initiated with the supplier. The initial results of the analysis indicated a deviation in the cutting process of the wiring harness at the supplier.
Further investigations were started to understand whether there was a more widespread possibility for damage to other wiring harnesses and if so, the extent of potential damage on the wiring harness and possibility of moisture ingress. During this process, the production plant reported additional vehicles that were found to have experienced a loss of electric power assist. MBAG reviewed its warranty claims and other field data and did not find any reports that were potentially related to this issue.
These findings indicated that if a vehicle were to have a damaged wiring harness, the part would have already been installed having prior damage rather than incurred during the production process.
MBAG reviewed its supplier’s production process in detail to understand the point in the process at which the wiring harnesses may have been damaged. The damaged wiring harnesses of vehicles identified at the production plant were reviewed in comparison to the supplier’s processes.
As a result, the root cause could be limited to a production deviation caused by incorrect parameters set in the process of cutting the wiring harnesses at the supplier. A correction of the process was immediately implemented at the supplier in February 2020.
Starting in February 2020, MBAG also analyzed the potential for vehicles in the field to have departed the production plant with a potentially affected wiring harness. In parallel, the range of potentially affected vehicles in the field was determined up to July 2020 based on logistics documents and supplier information.
Furthermore, a detailed analysis of the potential consequences of the damaged wiring harness was started. Other than the short-term consequences, an estimation of the risk over time for the affected vehicles was performed and compared to experiences and existing test results.
In October 2020, MBAG determined that a potential safety risk cannot be ruled out.
SEOCONTENT-START
Check/test procedure
1. Switch off ignition and store vehicle key at least 2 meters away from vehicle.
2. Remove lower engine compartment lining.
For basic data for model 253, see AR61.20-P-1105LW;
3. Release and remove both connectors at steering control unit (figure 1).
4. Check connector of red power supply cable and brown ground cable for moisture. In the case of moisture, make detailed photos, create the steering (N68) control unit log and clarify the further repair procedure via PTSS case.
5. Expose wiring harness up to a length of 300 mm from the connector. This can be achieved by sliding back the protective hose. There are two different cable routings (figure 1).
Figure 1 (Routing in cable duct) (Routing in protective hose) In the case of routing in cable duct
1. Release cable duct.
2. Mark position of cable ties so that these are located at same position during the installation.
3. Release cable ties (from the connector, the first four) and remove lines from cable duct.
4. Slide back the protective hose for check purposes. In the case of routing in the protective hose without cable duct
1. Mark position of cable ties so that these are located at same position during the installation.
2. Release cable ties (starting from the connector, the first two) and slide back the protective hose.
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P-RC-2020110012
6. Check the red power supply cable and brown ground cable 300 mm up to 320 mm after the connector for cuts in the insulation (figure 2). Move the red power supply cable and brown ground cable in all directions for check purposes. The red power supply cable and brown ground cable may not be damaged.
Figure 2 (NOT OK) The following damage may be present.
a. Brown ground cable damaged: Perform work procedure A.
b. Red power supply cable or both cables damaged: Perform work procedure B.
c. Red power supply cable and brown ground cable not damaged: End measure. The findings from the check/test procedure must be recorded in writing in the workshop order and
then stored in a tamperproof manner.
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P-RC-2020110012
Work procedure A
IMPORTANT: The original FlexRay cable installed in the vehicle remains in the vehicle and may in no case be damaged.
Replace brown ground line If the brown protective covering is damaged but no leads of the line can yet be seen, a quick test is not necessary. The brown ground line must be replaced. Only if the leads of the brown line can be seen:
1. Check connector couplings of the red power supply cable and brown ground line for moisture. Only if there are drops of water in the plug within the sealed area : Take detailed pictures, create a control unit log for the steering (N68), and clarify further repair procedure using a PTSS case. The red seal may appear a bit “wet” (in Figure 3 (A)). This is residual oil from manufacturing and is normal. If this is the only area that looks “wet” No PTSS case needs to be created in this case.
Figure 3 If no moisture can be detected near the contacts, a quick test with connected steering must be performed.
If the fault code B210F00 is stored in the steering control unit (N68), this can be ignored during the evaluation. This fault code has nothing to do with the current topic. This fault code arises if the workshop removes the power connector of the steering and the steering is not yet in sleep mode and/or is in idle state. Solely in the case of the following two fault codes P063500 or C159800 in the steering control unit,
a PTSS case must be created. Create steering (N68) control unit log and clarify the further repair procedure via PTSS case. If neither of the two indicated codes is stored, then only the brown ground line must be replaced. If the protective covering is damaged but no strands of the line can yet be seen, a quick test is not necessary. The brown ground line must be replaced.
1. Dismount right front wheel.
2. Remove fender liner in front fender (AR88.10-P-1300LW).
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P-RC-2020110012
3. Disconnect ground line at power connector at new and old wiring harness. The primary lock can be opened by moving the pink lug outwards (figure 4).
4. Disconnect plug contact (figure 5).
Figure 4 Figure 5
5. Open all cable ties at new wiring harness and remove both the FlexRay and the power supply line.
6. Unscrew cable lug of old ground line, cut off and wrap in fabric tape (figure 6).
Figure 6
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P-RC-2020110012
7. Screw new ground line onto ground point, connect into existing power connector and route parallel to existing line.In the case of routing in the protective hose, it must be ensured that the new ground line is also installed with the delivered protective hose. In the case of routing in the cable duct, an identical routing to the previous wiring harness must be ensured.
8. Assemble in reverse order.
Work procedure B
IMPORTANT: The original FlexRay cable installed in the vehicle remains in the vehicle and may in no case be damaged.
Replace red power supply line If the red protective covering is damaged but no leads of the line can yet be seen, a quick test is not necessary. Both lines must be replaced. Only if the leads of the red power supply cable can be seen:
1. Check connector couplings of the red power supply cable and brown ground line for moisture. Only if there are drops of water in the plug within the sealed area : Take detailed pictures, create a control unit log for the steering (N68), and clarify further repair procedure using a PTSS case. The red seal may appear a bit “wet” (in Figure 7 (A)). This is residual oil from manufacturing and is normal. If this is the only area that looks “wet” No PTSS case needs to be created in this case.
Figure 7 If no moisture can be detected near the contacts, a quick test with connected steering must be performed.
If the fault code B210F00 is stored in the steering control unit (N68), this can be ignored during the evaluation. This fault code has nothing to do with the current topic. This fault code arises if the workshop removes the power connector of the steering and the steering is not yet in sleep mode and/or is in idle state.
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P-RC-2020110012
Solely in the case of the following two fault codes P063500 or C159800 in the steering control unit
a PTSS case must be created. Create steering (N68) control unit log and clarify the further repair procedure via PTSS case. If neither of the two indicated codes is stored, then only the red power supply line must be replaced. If the protective covering is damaged but no strands of the line can yet be seen, a quick test is not necessary. The red power supply line must be replaced. In the case of damage to the red power supply line, the brown ground line is always also replaced.
1. Dismount right front wheel.
2. Remove fender liner in front fender (AR88.10-P-1300LW).
3. Unscrew ground line of steering (figure 6, see work procedure A)
4. Release all cable ties at cable duct in wheel arch and open cable duct (figure 8).
Figure 8
5. Remove cover over battery and remove filter housing (figure 9).
Figure 9
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P-RC-2020110012
6. Disconnect the contacts of power supply cable (figure 10).
In vehicles with 12 V on-board electrical system
a. Remove 12 V battery (AR54.10-P-0005LW).
b. Release prefuse box F32/3, unclip cover and disconnect power supply cable of steering (connection 8) (figure 10). For basic data, see AR54.15-P-1330LW.
Figure 10
In vehicles with 48 V on-board electrical system
a. Remove battery of 48 V on-board electrical system (AR54.10-P-0022LWO).
b. Release prefuse box F32/3, unclip cover and disconnect power supply cable of steering (connection 8) (figure 10). For basic data, see AR54.15-P-1330LW.
In the case of hybrid and all-electric vehicles
a. Perform power disable for vehicle (AR47.70-P-1000EQ).
b. Remove 12 V battery (AR54.10-P-0005LW).
c. Release prefuse box F32/3 and disconnect the power supply cable of steering (connection 8) (figure 10). For basic data, see AR54.15-P-1330LW.
7. Cut off power supply cable of steering (connection 8) approx. 100 mm after cable lug. Sharp edges that could cause potential chafe marks must be removed and insulated.
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P-RC-2020110012
8. Release engine compartment seal and place to one side, and unclip cable boot (figure 11).
Figure 11 Figure 12
9. Carefully open right cable boot (figure 12). For this purpose, accordingly remove cable tie and fabric tape.
10.At the new wiring harness, release cable ties at protective hose and remove the FlexRay cable or cut off if necessary.
IMPORTANT: The original FlexRay cable installed in the vehicle remains in the vehicle and may in no case be damaged.
11.Position new wiring harness, starting from ground branch-off line in wheel arch, parallel to the existing wiring harness. In the case of the branch-off line for the ground connection, ensure the correct position and route power supply cable along the existing wiring harness. Ensure a chafe mark-free routing!
12.Connect new line to prefuse box and tighten with 8 . Fully wrap line by means of fabric tape, parallel to the existing wiring harness, up to the branch-off line of the ground cable in the existing wiring harness (figure 13). Ensure a chafe mark-free routing!
Figure 13
13.Close cable boot using fabric tape (figure 13).
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P-RC-2020110012
14.Unscrew old ground line in wheel arch from ground point and cut off (figure 14).
Figure 14
15.Screw new ground line onto ground point in wheel arch with 10 .
16.Route entire new wiring harness parallel to the previous wiring harness and
wrap in fabric tape (figure 15). Attach old and new wiring harness at the marked locations (during removal) with cable ties and clips according to the original condition.
In individual cases, an additional cable duct can be installed. If the new wiring harness does not fit in the cable duct, the old ground cable and old power supply cable must be accordingly removed.
IMPORTANT: The original FlexRay cable installed in the vehicle remains in the vehicle and may in no case be damaged. Only in case of routing in cable duct
16.1. Slide back protective hose of old wiring harness up to start of cable duct.
16.2. Cut off old ground cable and old power supply cable in front of cable duct (arrow, see figure 15). This is necessary, as the cable duct is too small for two wiring harnesses.
IMPORTANT: The original FlexRay cable installed in the vehicle remains in the vehicle and may in no case be damaged.
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P-RC-2020110012
Figure 15 Only in case of routing in protective hose without cable duct
16.1. Cut off old power connector (figure 16) and wrap cable ends in fabric tape.
IMPORTANT: The original FlexRay cable installed in the vehicle remains in the vehicle and may in no case be damaged.
Figure 16
17.Connect power connector and FlexRay connector again to steering.
18.Assemble in reverse order. In the case of hybrid and all-electric vehicles, the HV system must be recommissioned.
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P-RC-2020110012
Primary Parts Information
Qty.
Part Name
Part Number
As required*
Wiring Harness, Steering
*
0.5**
Tape
A 007 989 07 85 08
* The replacement parts must be determined according to VIN via Xentry Portal Parts process (XPPI). Applicable harnesses for the Electric Power Steering can be found in parts group 54/121.
** 1 packaging unit must be used for 2 vehicles.
Warranty Information
Operation: Check electrical wiring harness of steering (02-1035)
Includes: Remove/install underfloor paneling
Replace ground line of steering (after check)(02-1036)
Replace power supply of steering (after check)(02-1037)
Includes: Replace ground line of steering
Extra work for: Replace power supply of steering in veh. with 48 V on-board electrical
System (02-1038)
Additional operation for hybrid and all-electric vehicles Perform power
disconnect/commissioning for high-voltage on-board electrical system (02-2193)
Create TIPS case (02-2186)
ONLY in case of moisture in connector or fault code P0603500 or C159800 in the steering
control unit N68
Perform quick test (02-1853)
ONLY in case of visible damage to line (strands visible)
Extra work for: Remove/install engine compartment lining in vehicle with underbody
protection (02-9676)
Damage Code
Operation Number
Labor Time (hrs.)
54 910 22 7
02-1035
0.6
02-1036*
0.5
02-1037
2.1
02-1038
1.0
02-2193
0.5
02-2186
0.2
02-1853
0.2
02-9676
ZM
*Cannot be claimed in combination with 02-1037 Note
Operation Number labor times are subject to change.
************************************************************************************************
December, 2020
Dear Mercedes-Benz Owner:
This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act.
Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has decided that a defect which relates to motor vehicle safety exists in
certain Model Year (“MY”) 2020 GLC-Class vehicles. Our records indicate that your vehicle is included in the affected population of vehicles.
What is the CONCERN? On certain Model Year MY 2020 GLC-Class vehicles, the power steering control unit wiring harness might have
been damaged during the production process. A damaged wiring harness could lead to moisture ingress into the
wiring harness and/or the power steering control unit, resulting in a loss of the power steering assist, which could
increasing the risk of a crash. In addition, a damaged wiring harness could result in a short circuit, which could
increase the risk of a fire.
What will your DEALER DO? An authorized Mercedes-Benz dealer will check the wiring harness of the steering control unit on the affected
vehicles and replace it, if necessary. This service will be provided free of charge. We are dedicated to always
delivering the best customer experience, and respect for your time is a top priority. While the minimum repair
time can be 5.5 hours, your dealer can provide you with a better estimate of the overall time for this service visit.
As a matter of normal service process, an authorized Mercedes-Benz dealer will also check for other repair
measures which might be applicable to your vehicle which may increase the required working time.
What should YOU DO? For additional information and to schedule an appointment, please contact your preferred authorized Mercedes-
Benz dealer at your earliest convenience. To locate authorized dealers see www.MBUSA.com/recall. Please
mention you are scheduling an appointment to check and replace the wiring harness under under Recall
Campaign # 2020110012. You may be asked for your 17-digit Vehicle Identification Number (VIN) which for
your convenience is located above your name at the top of this letter.
Impacts from COVID-19: Your health and safety remain our top priority. The Mercedes-Benz dealerships remaining
open for recall repairs and service are closely following the guidelines set forth by the CDC. Free Mobile Repair
at your home or business as well as vehicle pick-up and delivery may be available. Your preferred authorized
Mercedes-Benz dealer can confirm availability.
Information for Owners In the event that you are no longer the vehicle owner, or have had a change of address, please complete the
reverse side and return the updated information in the enclosed envelope.
If this is a leased vehicle and the lessor and registered owner receive this notice, please forward this information
by first class mail to the lessee within 10 business days to comply with Federal Regulations.
A VIN-based recall lookup tool on our MBUSA.com website offers a search feature that will indicate whether a vehicle has been subject to a safety
recall, and whether that vehicle has had the free remedy performed. See www.mbusa.com/recall. Should you have any questions or encounter any
difficulty regarding this Recall Campaign, please contact an authorized Mercedes-Benz dealer. If for any reason a dealer is unable to remedy your
situation, we are always happy to hear from you. Please contact us at 1-(800) FOR-MERCEDES (1-800-367-6372).
If an authorized Mercedes-Benz dealer for any reason is unable to remedy the situation without charge, or within a reasonable amount of time, pursuant
to law 49 U.S.C. Chapter 301, you may submit a complaint to the Administrator, National Highway Traffic Safety Administration, 1200 New Jersey
Avenue, S.E., Washington, D.C. 20590 or call the toll-free Auto Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153); or go to
https://www.safercar.gov.
We apologize for any inconvenience this situation may cause you.
Sincerely,
To find the most
convenient
authorized
Mercedes-Benz
dealer from your
smartphone, scan
the QR code to
the left.
• A remedy is available for your vehicle.
• Schedule an appointment with your authorized
Mercedes-Benz dealer as soon as possible.
• This repair will be provided free of charge.
IMPORTANT SAFETY RECALL 2020110012
This notice applies to your vehicle, VIN:
Replace Steering Control Unit Wiring Harness
NHTSA Recall #20V651
IMPORTANT
If for any reason YOU NO LONGER OWN THIS VEHICLE OR have a CHANGE OF ADDRESS, please COMPLETE THE SECTION BELOW, place in
the ENCLOSED ENVELOPE, and DROP IN ANY MAIL BOX. If possible, provide the name and address of the present owner so that we may
contact them.
EXPORTED
LEASE, VEHICLE RETURNED
SCRAPPED
SOLD
STOLEN
OTHER
NEW OWNER INFORMATION MY NEW NAME OR ADDRESS IS:
Last Name, First Name
Street Apt
City State ZIP
Email Address
Phone (numbers only) Mobile (numbers only)
———————————————– ———————————————————————————-
Date Signature
**** PLEASE DO NOT DETACH. RETURN COMPLETE LETTER ****
DO NOT USE THE ENCLOSED ENVELOPE FOR OTHER CORRESPONDENCE
VIN:
SEOCONTENT-END
4 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
| MERCEDES BENZ | GLC300 | 2020 |
| MERCEDES BENZ | GLC350E | 2020 |
| MERCEDES BENZ | GLC43 AMG | 2020 |
| MERCEDES-BENZ | GLC63 AMG | 2020 |
17 Associated Documents
Recall Quarterly Report #3, 2021-2
RCLQRT-20V651-4200.PDF 211.333KB
Manufacturer Notices(to Dealers,etc)- Recall Campaign Launch Notification Replace Steering Control Unit Wiring Harness MY20 253 (GLC-Class)
RCMN-20V651-0825.pdf 648.029KB
Remedy Instructions and TSB
RCRIT-20V651-1128.pdf 528.535KB
Manufacturer Notices(to Dealers,etc)- Recall Campaign Launch Notification Replace Steering Control Unit Wiring Harness MY20 253 (GLC-Class)
RCMN-20V651-4875.pdf 626.286KB
ISSUED Owner Notification Letter(Part 577)
RCONL-20V651-3641.pdf 209.592KB
Recall Quarterly Report #1, 2020-4
RCLQRT-20V651-9745.PDF 211.147KB
Remedy Instructions and TSB
RCRIT-20V651-1887.pdf 549.893KB
Recall 573 Report – Amendment 3
RCLRPT-20V651-9377.PDF 215.974KB
Chronology
RMISC-20V651-9967.pdf 66.587KB
Recall Acknowledgement
RCAK-20V651-4466.pdf 244.846KB
Recall 573 Report – Amendment 1
RCLRPT-20V651-2444.PDF 215.979KB
Defect Notice 573 Report
RCLRPT-20V651-9034.PDF 215.978KB
Recall Quarterly Report #2, 2021-1
RCLQRT-20V651-3006.PDF 211.248KB
Recall 573 Report – Amendment 2
RCLRPT-20V651-8347.PDF 215.983KB
Manufacturer Notices(to Dealers,etc)- Recall Campaign Launch Notification Replace Steering Control Unit Wiring Harness
RCMN-20V651-6303.pdf 625.257KB
Manufacturer Notices(to Dealers,etc)- Recall Campaign Initial Notification Replace Steering Control Unit Wiring Harness Insulation MY20 253 (GLC-Class)
RCMN-20V651-1821.pdf 103.127KB
Remedy Instructions and TSB
RCRIT-20V651-4923.pdf 549.566KB
Latest Recalls Documents
- [Easy to Use—Work Out of the Box] + [FOXWELL 2026 New Version] FOXWELL NT604 Elite scan tool is the 2026 new version from FOXWELL, designed for car owners who want to figure out the cause of issues before fixing car problems by scanning common systems like ABS, SRS, engine, and transmission. The NT604 Elite obd2 scanner diagnostic tool comes with the latest software—no need to waste time downloading software first. Plug the scanner into the OBDII port with OBDII cable to start the diagnosis.
- [Affordable] + [Reliable Car Health Monitor] Will you be confused what happens when the warning light of ABS/SRS/transmission/check engine flashes? Instead of taking your cars to dealership, this FOXWELL scanner will help you do a thorough scanning and detection for your cars and pinpoint the root cause. Note：The device is a diagnostic tool, not a repair tool. To turn off a warning light, you must first physically repair the issue causing it. Only then can the scanner be used to clear the corresponding fault code.
- [5 in 1 Car Diagnostic Scanner] Compared with obd scanners (50-100), NT604 Elite code scanner not only includes their OBDII diagnosis but also serves as ABS/SRS scanner, transmission and check engine code reader. When it’s an odb2 scanner, you can use it to check if your car is ready for annual test through I/M readiness menu. In addition, live data stream, built-in DTC library, data play back and print, all these features are a big plus for it. Note: doesn't support maintenance functions like reset or relearn. For the SRS system, NT604 Elite can read and clear common fault codes not caused by a crash, but crash/collision data cannot be cleared.
- [Fantastic AUTOVIN] + [No extra software fee] Through the AUTOVIN menu, this NT604 Elite car scanner allows you to get your V-IN and vehicle info rapidly, no need to take time to find your V-IN and input one by one. What's more, the NT604 Elite ABS SRS scanner supports 60+ car brands from worldwide (America/Asia/Europe). You don’t need to pay extra software fee. AUTOVIN may not work on some older vehicles or certain vehicle brands. If AUTOVIN fails, please input the vin code manually or go to the Diagnostic Menu to select your vehicle model.
- [Solid protective case KO plastic carrying bag] + [Lifetime update] Almost all same price-level car scanner diagnostic tool only offers plastic bag to hold the scanner.However, NT604 Elite automotive scanner is equipped with solid protective case, preventing your obd2 scanner from damage. Then you don’t need to pay extra money to buy a solid toolbox.
- [Diagnose Like a Pro] BlueDriver Pro Next-Gen is a professional OBD2 scanner and diagnostic tool that helps you scan, understand, and clear vehicle trouble codes with confidence. Turn your phone into a powerful car diagnostic scanner—no guesswork, no unnecessary repairs.
- [Read and Clear More Codes Than Ever] Read and clear more codes than basic car code readers. Access enhanced diagnostics for Check Engine, ABS, SRS, Airbag, TPMS, Transmission, and more on supported vehicles, including expanded coverage on newer model years.
- [Verified Fixes and Real-Time Data] Get unlimited, technician-verified repair reports matched to your VIN, with definitions, causes, and confirmed fixes. Monitor live vehicle data as you drive, view freeze frames, check smog readiness, and analyze Mode 6 test results.
- [Expanded Make & Model Coverage] Optimized for today’s vehicles with strong support for GM, Ford, Stellantis (RAM, Jeep, Chrysler), Toyota, Honda, Nissan, Mazda, Subaru, Hyundai, Mercedes-Benz, BMW, and VW. Enhanced communication on select 2024+ Nissan and Mazda models (see compatibility chart).
- [Gas Vehicles 1996+ & Select Light-Duty Trucks] Works with all gas-powered vehicles made in 1996 or newer, plus select light-duty trucks and diesels, including F-250, RAM 2500, Silverado, and Sierra. Built for daily drivers, family vehicles, and real-world truck use.
- Advanced VCI Box, Industry-leading J2534 Pass-Thru Technology: This J2534 Pass-Thru Programmer is designed espically for technicians, independent shop owners, and DIY enthusiasts, enables fast, reliable computer-based programming. It supports all J2534 protocols—including the latest DoIP and CAN FD—ensuring full compatibility with both legacy and next-generation vehicles.
- High-Speed OEM-Level Diagnostics & Programming: Unlock true OEM functionality with comprehensive system diagnostics, guided troubleshooting, coding, adaptations, resets, and programming—all designed to slash repair time. This all-in-one tool eliminates the need for multiple OEM devices, boosting efficiency and cutting costs. Equipped with High-Speed USB, it delivers 10x more data per second than competing solutions
- Coverage for 17 Car Brands & Ultra Reliability: Works seamlessly for Chrysler, for Ford(Forscan), for GM, for Nissan, for Toyota, for Honda, for Subaru(SSM4), for Land Rover/Jaguar, for Volvo, for Wuling, for Volkswagen, for Mercedes-Benz, and for BMW. Backed by over 10000 real vehicle tests and benefit from a wealth of practical experience, this OEM reprogramming tool guarantees stable and exceptional performance
- User-Friendly RLink Platform & Expert Support: TOPDON’s proprietary driver management platform offers a clean interface and lifetime free updates. Access a rich library of real-world case studies to stay ahead of the curve. Backed by a support team with 10+ years of J2534 and automotive repair experience, we provide one-on-one assistance to resolve any technical issue.
- 6.6 ft USB-C Cable & Portable Storage Case: The RLink J2534 diagnostic tool features a 6.6ft USB 2.0 Cable and a 1.2 ft OBDII Extension Cable, allows to connection your computer easily outside the vehicle. The included handled carry case offers easy portability, storage, and hanging options—keeping your gear clean and ready to go, anywhere.
- 【Warm Tips】Wired THINKSCAN 689 is connected through a detachable OBDII cable, and we also have added OBD2 Extension Cable (about 60 cm/2 feet) as g ift, enabling customers handling vehicle repairs with ease. Just click "Bundles Item" above to get it. Note: FCA AutoAuth is a third-party service, additional cost may be required.
- 【Professional Car Diagnostic Tool】Tired of renew fees? Thinkscan 689 scanner provides dealer-level advanced functions without annual fees for auto mechanics and repair shops. 34+ Services, 3000+ Active Test, ECU Coding, 140+ Brands Coverage, FCA AutoAuth, CANFD&DOIP Protocol, Component Matching, Power Balance, V.A.G Guided, Compatible with Google Chrome integration, etc. With strong hardware backing, 64G Memory, Android 10, 4-core processors, and 4150mAh battery. Thinkscan 689 brings you the best as your daily business helper and never lets you drop the ball!
- 【Over 34 Reset Service, Adaptation + Relearn + Calibration + Initialization + Matching】Made for workshops, Thinkscan 689 scanner provides 34+ services for worldwide vehicles: such as Gear/SAS/EPB/TPMS/D.P.F/I.M.M.O/BMS/ETS/Oil/Brake/AFS/GEARBOX/SUNROOF/SUS Reset, ABS Bleed, Injector coding, etc. Warm tips: Compatibility may vary on vehicles' model and year, please contact seller before purchase to make sure it works well on your cars.
- 【Real Active Test】Thinkscan 689 scan tool features over 3000+ full bi-directional control ability, to send commands to vehicle’s systems/components, to verify system input/output without using the vehicle's controls, e.g. turn on the radiator fan, modulate the throttle, open/close windows, operate mirrors, Injector Buz Test, turn on interior&exterior lights, sound horn, test door lock actuators, turn on/off front/rear side ACM Solenoid, Vehicle level position calibration, Wheel Speed Sensor Supply.
- 【Comprehensive Solutions with Advanced Features】Take your vehicle customization to the next level with the Thinkscan 689's advanced ECU coding capabilities. This scan tool provides power balance, PMI, unlock more new features and enhance performance by activating dormant functions, customizing OE settings, matching replaced components, and reprogramming adaptive data to elevate your driving experience. Note: Compatibility varies by car models, please check before order.
- 【Read Fault Codes】About the read code funtion needs to be in the ignition on state and if the check engine light is on. If the vehicle is compatible with NT301, please select correct menu & ensure no hardware/wiring issues/obd2 interface damage for accurate results. The correct menu: Select OBDII-> Wait for seconds-> Select Read codes.
- 【Vehicle CEL Doctor】The NT301 obd2 scanner enables you to read DTCs, access to e-missions readiness status, turn off CEL(check engine light) or MIL, reset monitor, read live data and retrieve VIN of your vehicle. The fault code will appear again even though you cleared before, if you don't repair the car completely. The fault code only can be cleared by NT301 after car repair finished, as like all the obd2 scanner's working principle.
- 【Live Data Graphing & Accuracy for Most OBD2 Vehicles】View and log live sensor data in graph form—monitor oxygen sensors, fuel trims, coolant temp, RPM, and more. Spot trends and suspicious values in real time. Compatible with most 1996+ gasoline cars, light trucks, and SUVs sold in the U.S., as well as many 2000+ European and Asian models. Also works on 12V diesel vehicles equipped with OBD2. It's a basic code reader and DOESN'T't support to scan ABS, SRS, EPB, A/C systems, battery, etc, . It also DOESN'T support ANY special functions like bidirectional control, calibration or reset advanced function related.
- 【Advanced OBDII Modes 】 This car scanner provides enhanced obd2 modes capabilities: O-2 sensors test and EVAP system leak monitor. It allows you to run a leak check on your car’s EVAP system and assess the fuel tank’s condition. The O-2 sensor test helps optimize the air-fuel ratio, boosting fuel economy and cutting em-issions. Saving you money on gas and reducing your vehicle’s environmental footprint.
- 【OBDII Protocols & Compatibility】The NT301 supports OBDII protocols like KWP2000, J1850 VPW, ISO9141, J1850 PWM and CAN. The device is compatible with 1996 US-based, 2000 EU-based and Asian cars, light trucks, SUVs. Kindly check the vehicle compatibility before the purchase since the function comatibility and car compatibility vary from different car models, year and vin.
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