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 is expected to begin December 22, 2020. Owners may contact MBUSA customer service at 1-800-367-6372.
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. |
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| 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. |
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| 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
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.
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 |
4 Associated Documents
Chronology
RMISC-20V651-9967.pdf 66.587KB
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Open in new tab Recall Acknowledgement
RCAK-20V651-4466.pdf 244.846KB
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Recall 573 Report – Amendment 1
RCLRPT-20V651-2444.PDF 215.979KB
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Defect Notice 573 Report
RCLRPT-20V651-9034.PDF 215.978KB
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Latest Recalls Documents
https://www-odi.nhtsa.dot.gov/acms/cs/documentList.xhtml?docId=20V651&docType=RCL
For the most up to date documents from NHTSA for this Recall, click the lick above
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