20P2197228 – Differential Locking System – 2019-2020 Mercedes-Benz G-Class

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February 14, 2020 NHTSA CAMPAIGN NUMBER: 20V090000

Loss of Stability Control and Anti-Lock Brakes

Deactivation of the vehicle stability control system or anti-lock brakes may increase the risk of a crash.

 

NHTSA Campaign Number: 20V090

Manufacturer Mercedes-Benz USA, LLC.

Components SERVICE BRAKES, HYDRAULIC, POWER TRAIN, ELECTRONIC STABILITY CONTROL

Potential Number of Units Affected 6,517

 

Summary

Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2019-2020 G550 4MATIC and G63 AMG 4MATIC vehicles. An electrical resistor within the differential locking module may malfunction, interrupting communication between the control unit and the differential locking actuator, possibly resulting in the deactivation of the Electronic Stability Program (ESP) and Anti-lock Brake System (ABS) while driving.

 

Remedy

MBUSA will notify owners, and dealers will inspect the differential locking modules and replace them as necessary, free of charge. An interim letter informing owners of the safety risk was mailed March 27, 2020. A second notice will be sent once the remedy is available. 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

 


2020 Mercedes-Benz G-Class
2020 Mercedes-Benz G-Class

 


This is to notify you of a Recall Campaign Launch regarding the control unit of the differential locking module in 6,300 Model Year (“MY”) 20192020 G-Class (463 platform) 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 August 14, 2020.

 

Issue

Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has determined that on certain Model Year (“MY”) 2019-2020 G-Class vehicles (463 platform), the control unit of the differential locking module might not meet current production specifications. The electrical contact of a specific resistor might be impaired due to sulfur fumes originating from the axle oil. If the resistor is impaired, the electrical currents would have a higher value than what actually exists.  As a result, the communication between the control unit and the locking actuator will shut down and the differential locking status might no longer be reliably determined. Both ESP and ABS systems would then be deactivated which could increase the risk of a crash under certain operating conditions. The customer will be made aware of the issue by an ABS and ESP message in the instrument cluster.

 

What We’re Doing

MBUSA will conduct a voluntary recall. An authorized Mercedes-Benz dealer will check the differential locking modules on the affected vehicles and replace them, if necessary.

 

Parts

Parts are available and can be ordered as necessary.

 

Customer Notification Timeline

Customer letter will be mailed on August 21, 2020

 


IMPORTANT SAFETY RECALL
This INTERIM notice applies to your vehicle,
Differential Locking System
NHTSA Recall #20V090

March, 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”) 2019 – 2020 G-Class (463 platform) vehicles. Our records indicate that your vehicle is included in the affected population of vehicles.

 

What is the Concern?

In certain MY19-20 G-Class vehicles (463 platform), the control unit of the differential locking module might not meet current production specifications. Under certain conditions, the electrical contact of a specific resistor might become impaired and affect the communication between the differential control unit and the locking actuator. As a consequence, both the ESP and ABS systems would be deactivated. Deactivation of the vehicle stability control system or anti-lock brakes may increase the risk of a crash. The driver is made aware of the issue by an ABS and ESP message in the instrument cluster.

An authorized Mercedes-Benz dealer will check the differential locking modules on the affected vehicles and replace them, if necessary.

Unfortunately, the parts to remedy this situation are not available. We are working to obtain the necessary parts as quickly as possible. As parts become available, we will send you another letter asking you to take your vehicle to an authorized Mercedes-Benz dealer to have the recall repair completed free of charge.

Should you have any concerns or questions regarding your vehicle before you receive the next recall letter when parts are available, please contact an authorized Mercedes-Benz dealer. If for any reason a dealer is unable to resolve your question or concern, we are always happy to hear from you. Please contact us at 1-800-367-6372. A new vehicle identification number (VIN)-based recall lookup tool, on our MBUSA.com website, now offers a search function that will indicate whether a vehicle has been subject to a safety recall, and whether that vehicle has had the free remedy performed. Please visit www.MBUSA.com/recall.

If you are no longer the vehicle owner, or have a change of address, please complete the reverse side of this letter and return the complete letter 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 days to comply with federal regulations.

If a 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 regret any inconvenience this situation may cause you.

Sincerely,

IMPORTANT VIN:

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.

 


Check/test procedure 

  1. Remove lower center engine compartment lining (AR61.20-P-1105XG).

 

  1. Check part number at top at actuator of differential lock of front axle.

 No actuator with the item number A 463 906 33 01 may be installed.

Perform check using a mirror as shown in (Figure 1).

part number

Figure 1

 

  1. Check part number at top at actuator of differential lock of rear axle using a mirror (Figure 2).  No actuator with the part number A 463 906 34 01 may be installed.

If part number of actuator at rear axle cannot be read off due to undercoat / paint coat or parts sticker is no longer legible, the actuator will be replaced.

part number

Figure 2

 

  1. Part number illegible or corresponds to A 463 906 33 01 and/or A 463 906 34 01: Perform work procedure.
  2. Part number does NOT correspond to A 463 906 33 01 and does NOT correspond to A 463 906 34 01: End measure.

 

The results of this check must be documented in writing on the work order.

 

Work procedure 

  1. Replace actuator of differential lock at front axle and/or rear axle.

The parking brake on the rear axle must be opened after the vehicle has been lifted.

To do this, press the start button twice without actuating the brake pedal (ignition on) – actuate the brake pedal – move selector lever to  “N” position (read on display) – open parking brake – switch off ignition.

Attention: Now that the vehicle is in permanent “N,” there is a risk of the vehicle rolling away.

Only actuators with incorrect or illegible part number will be replaced.

For basic data for actuator of front axle, see AR33.40-P-0001XGA.

For basic data for actuator of rear axle, see AR35.40-P-0001XGA.

The actuator bolts N 000 000 001 433 and N000 000 003 3967 are not one time use and it can be reused for this specific campaign.

New actuator must not be painted.(Figure 3)

Observe installation instructions for rear axle actuator.

New actuator must not be painted

Figure 3

 

Important: The new rear axle actuator from the replacement parts department is delivered in “lock engaged” condition. (Visible by the position of the bolt on the actuator)(figure 6)

To install the new actuator, the lock in the rear axle must be engaged manually.

With the actuator removed, the slider in the axle tube for actuating the lock must be moved in the direction of the axle centerpiece (figure 5), e.g. with a Torx wrench. One of the rear wheels must be turned at the same time.

The bolt of the actuator is always installed in the large opening.(figure 4 and 5)

lock NOT engaged: slider to wheel

Figure 4 (lock NOT engaged: slider to wheel)

 

(lock engaged: slider to axle centerpiece

Figure 5 (lock engaged: slider to axle centerpiece)

 

installation position of rear axle actuator with new part

Figure 6 (installation position of rear axle actuator with new part)

 

The differential lock opens automatically during the first ignition sequence.

  

  1. Check differential locks of front and rear axle for proper operation.

For this purpose, start the engine – engage low range “N” position – actuate transfer case differential lock switch/rear axle differential lock switch/front axle differential lock switch – drive in gentle figure 8 lines at walking pace in an open area until the red feedback of all three locks appears on operating switch (figure 7) – deactivate locks and low range.

sfer case differential lock switch/rear axle differential lock switch/front axle differential lock switch

Figure 7

 

Primary Parts Information

Qty. Part Name Part Number             
As required Parts kit for front axle  differential lock actuator A 463 906 46 02
As required Hexagon head bolt N 910 105 010 016
As required Parts kit for rear axle differential lock actuator A 463 906 55 02

 


August 6, 2020

Re:  Recall NHTSA 20V090 – Loss of Stability Control and Anti-Lock Brakes 

On February 14, 2020, MBUSA submitted a Safety Defect and Non-Compliance Information Report, in accordance with 49 C.F.R Part 573.6, affecting (6,517) 2019-2020 Mercedes-Benz GClass vehicles (463 platform), accepted under NHTSA Recall No. 20V090.  (217) vehicles from the affected vehicle subject to the recall was identified to be within MBUSA’s possession and will be repaired prior to entering the stream of commerce. Changes will be made on total number of units potentially involved and descriptive information to reflect vehicle population adjusted from 6,517 to 6,300 vehicles.

As such, MBUSA will not mail an owner notification letter for (217) vehicles from the affected vehicle subject to the recall.

 


Chronology :

In July 2018, MBAG launched an initial investigation based on isolated cases of field reports from various markets where customers reported receiving an in-vehicle message about a malfunction with the locking mechanism of the rear differential.

MBAG requested that parts from affected vehicles be returned for further analysis. MBAG’s analysis continued through the end of 2018 and into 2019 and involved an analysis of the performance of a variety of different components of the differential locking systems. In April 2019, MBAG’s analysis began to focus in on the operation of a specific resistor within the differential system.

The analysis eventually found that sulfur from the axle oil was impacting the performance of an electrical contact in the resistor and MBAG began to analyze the effects of an affected resistor. It was found that if a resistor were impacted, communication between the differential control unit and the differential locking actuator would be interrupted. The differential control unit would interpret the differential as being in a “locked” condition and ABS and ESP functions would be deactivated.

The deactivation of these systems is consistent with the strategy for a locked differential and is a protective measure. It was also found that if the condition occurred at low speeds, as was consistent with most reports from the field at the time, the vehicle could be stopped safely and braking performance was not affected. Subsequently, in December 2019, MBAG analyzed the effects of the condition at higher rates of speed. While field data indicates less than 2% of the reports occurred at higher operating conditions, on February 7, 2020, decided to conduct a recall to address the condition.

 


4 Affected Products

Vehicles

MAKE MODEL YEAR
MERCEDES BENZ AMG G63 2019-2020
MERCEDES BENZ G550 2019-2020

 


16 Associated Documents

Recall 573 Report – Amendment 2

RCLRPT-20V090-7241.PDF 215.47KB

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ISSUED Interim Owner Notification Letter(Part 577)

RIONL-20V090-7369.pdf 162.282KB

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Manufacturer Notices(to Dealers,etc) – Recall Campaign Initial Notification – Differential Locking System MY19-20 463(G-Class)

RCMN-20V090-5299.pdf 170.687KB

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Defect Notice 573 Report

RCLRPT-20V090-6911.PDF 214.922KB

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Recall Acknowledgement

RCAK-20V090-4349.pdf 244.936KB

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Recall 573 Report – Amendment 1

RCLRPT-20V090-1369.PDF 215.44KB

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Recall 573 Report – Amendment 3

RCLRPT-20V090-4005.PDF 215.472KB

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Miscellaneous Document – Re: Recall NHTSA 20V090 – Loss of Stability Control and Anti-Lock Brakes

RMISC-20V090-5210.pdf 87.164KB

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Remedy Instructions and TSB

RCRIT-20V090-6268.pdf 361.163KB

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Recall Quarterly Report #1, 2020-3

RCLQRT-20V090-2286.PDF 211.148KB

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Recall Quarterly Report #2, 2020-4

RCLQRT-20V090-9984.PDF 211.252KB

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Remedy Instructions and TSB

RCRIT-20V090-6645.pdf 361.894KB

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Recall 573 Report – Amendment 4

RCLRPT-20V090-7171.PDF 215.476KB

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Manufacturer Notices(to Dealers,etc)- SUBJECT: Model G-Class vehicles (463 platform) Model Year 2019-2020 Check Differential Locking System

RCMN-20V090-0606.pdf 523.761KB

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Recall 573 Report – Amendment 5

RCLRPT-20V090-5451.PDF 215.472KB

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ISSUED Owner Notification Letter(Part 577)

RCONL-20V090-6379.pdf 208.368KB

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Latest Recalls Documents

For the Latest and Most Recent Recalls Information Visit the link below…

https://www-odi.nhtsa.dot.gov/acms/cs/documentList.xhtml?docId=20V090&docType=RCL

 


 

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LAUNCH X431 PRO 5 Scan Tool: 2024 J2534 Reprogramming Tool, ECU Online Coding, Topology Mapping, Upgraded of X431 V+, Bi-Directional Diagnostic Scanner, with SmartBox 3.0 CANFD & DOIP, 2 Years Update
  • 👍【Why Choose LAUNCH scanner X431 PRO5】It is the original LAUNCH X431 scan tool, the 2024 upgraded version of PROS V+, X431 PRO3 and V+ 4.0, which is a worthwhile investment for repair shops and mechanics. LAUNCH X431 PRO 5, all is set to OE-level standards with 1) J2534 ECU Programming & 50+ service same as PAD Series; 2) Bi-directional control + All system diagnostics as Snap-on scanner; 3) Online Coding functions directly connect to OEM server; 4) Top-notch Topology Mapping function
  • 👍【J2534 Programming with Smart Box 3.0】 What is super SmartBox 3.0 VCI? Worth 1000$, Smart Box 3.0 is backed on new ISO9141/J1850/SAE J2610/CANFD/DOIP, which enables you to run 14x quicker data trans and advanced OEM J2534 reprogramming for B-MW, Ben-z, F-ord, Jaguar, Land Rover, GW, Volvo, etc. (please reach to us for more details). It also serves as a wireless VCI allowing the vehicle to transmit data to the diagnostic tablet without a physical connection.
  • 👍【New Released Topology Mapping】Update your X431 PRO 5 to V 7.03.014 to gain Topology Mapping function. This advanced feature, typically found only on tools costing over $3000, provides a comprehensive view of a vehicle's data bus configurations, improving repair efficiency by up to 90%. With just one click, you can gain insights into the layout of a vehicle's system and clear any troubles. Compatibility with your vehicle's brand should be verified by checking the VIN before purchasing.
  • 👍【LAUNCH X431 PRO 5 with Powerful 50+ Services】Especially designed for pro mechanics and big repair shops, Launch X431 scanner PRO5 is equipped with 50+ hot reset functions for 150 car makes which same as X431 PAD serious. Easy to navigate and help you do ABS Bleeding, TPMS Reset, Oil Reset, EPB Reset, Suspension, BMS, Injector Coding, IMMO, Power balance, Throttle Matching and more. 🚩Notice: we offer 2-year f ree update while other brands generally 1 year.
  • 👍【A-ctive Test + Local-smith Level ECU Coding】Come with appealing bi-directional control to troubleshoot all possible problems for full systems within 5 min.This LAUNCH X431 PRO scanner even develops all practical functions needed by all technicians:1) ECU Coding for replacing, match, relearn, recode new ECU modules;2) Online Coding for B-MW, VW, Porsche, Ben-z to surf OEM data;3) VAG Guided functions ease complex issues;4) Personalization & ADAS improving car performance and driving safety.
Bestseller No. 9
ZMOON ZM201 Professional OBD2 Scanner Diagnostic Tool, Enhanced Check Engine Code Reader with Reset OBDII/EOBD Car Diagnostic Scan Tools for All Vehicles After 1996, 2023 Upgraded
  • ✔Full OBDII Modes Scanner for Car: As professional car scanner, ZM201 has all the OBD2 functions you need.🔎Read & clear codes, 💡turn off engine light or MIL, ❄view freeze frame, 📋read I/M readiness, 🚕retrieve vehicle VIN, 🔋battery voltage test, 📈live data stream (with graphing display), ✅built-in 35901 DTCs, O2 sensor test, onboard monitoring mode, and perform component testing etc.
  • ✔Enhanced OBD2 Scanner Diagnostic Tool: Live data and DTC replay combined with printing function, you can connect it to a computer for fault data printing, prevent auto repair shops from charging randomly, save money and time. ZM201 obd scanner also comes with free-lifetime software updates, ensuring you always have the latest features and improvements.
  • ✔35,901 DTC Lookup: ZM201 car code reader built-in 35,901 DTCs, the old model obd2 usually only have 3,000-10,000. So the ZM201 car scanner has a huge advantage, which means that this obd2 scanner can better help diagnose and solve your vehicle faults. This is a great option if you want to replace or upgrade an existing car scanner.
  • ✔Compatible with 98% Vehicles: ZM201 OBD2 scanner for car is compatible with most cars after 1996(USA)/2002(EU)/2008(Asia). If your car has an OBD2 port (16Pin), and the production time meets the above timeline, then your vehicle is compatible. But it is not compatible with new energy vehicles, hybrid vehicles, and models that do not comply with the OBD2 protocol.
  • ✔Convenient Shortcut Functions: The addition of shortcut keys enhances the user experience. Pressing F1 enables you to quickly retrieve trouble codes, while F2 provides instant access to I/M readiness information. We've also introduced left and right navigation buttons (the previous model had only up and down buttons), making operation even more convenient.
Bestseller No. 10
XTOOL AD20 Pro OBD2 Scanner for iPhone & Android: 2024 Newest Wireless OBD2 Diagnostic Scan Tool for All Cars with Full System Diagnostics, Oil Reset, Check Engine Car Code Reader, Performance Test
  • 🚘 XTOOL Advancer AD20 PRO 👉 2024 newest upgraded Version of AD20, A wireless obd2 code reader integrates full 10 of OBDII tests, all system scan, engine light check, oil rest, battery check, DTC lookup, performance test, trip analysis and other powerful features, Whether you're a professional mechanic or an inexperienced DIYer, repairs can be done easily.
  • 🚘 All System Diagnostic Scanner 👉 AD20 Pro diagnostic scan too features with all system scan (In-depth check), accesses all vehicle systems. scan and clear manufacturer specific DTC codes that can’t be found on those c·heap obd scanners. Not just scan and check engine faults, AD20 Pro allows you to perform all scans to Engine, Powertrain, Steering & Brake, Airbag, ABS and more. Note: Read/clear code only, NOT FOR RESET.
  • 🚘 Check Engine Light & Oil Reset 👉 Easily find out why the check engine light is on by yourself, quickly read and clear the diagnostic trouble code,view freeze frame, I/M monitor readiness. Also features with oil reset special function, you can effortlessly maintain the oil light at home instead of taking car to mechanic shop. Save your time and m·oney.
  • 🚘 User Friendly Exclusive App 👉 Our value is based on comes with its own APP f‘ree downloadable on iPhone iOS, Pad, and Android. lifetime f’ree download, no subscription f‘ee at all. No need to spend a lot of time repeatedly switching through third party apps of varying quality for different features. With its simple interface and complete features and a customized dashboard, you can display your preferred functions, allowing you to focus on the most importantl data intuitively.
  • 🚘 Track the Vehicle Performance 👉 The AD20 Pro supports a variety of performance tests and trip analyses. Performance Test allows you to measure datas such as 100 km/h acceleration time/top speed/engine load/engine coolant temperature. Trip Analysis gives you access to data such as top speed, average speed, average fuel consumption etc, analysing driving behaviour, helping you to monitor your car's performance over time and optimise your driving behaviour, improving driving safety. Also support personalise your head-up display with the Smart Dash feature.

Last update on 2024-03-08 / Affiliate links / Images from Amazon Product Advertising API

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