Check the Transmission Wiring Harness – 2020 Mercedes-Benz GLC-Class

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July 11, 2022 NHTSA CAMPAIGN NUMBER: 22V494000

Misrouted Transmission Wiring Harness

A loss of drive power can increase the risk of a crash.

 

NHTSA Campaign Number: 22V494

Manufacturer Mercedes-Benz USA, LLC

Components POWER TRAIN

Potential Number of Units Affected 1,168

 

Summary

Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2020 GLC350E4 vehicles. The transmission wiring harness may be routed improperly, allowing it to chafe against the front drive shaft, which can cause loss of drive power.

 

Remedy

Dealers will inspect and replace the transmission wiring harness, as necessary, free of charge. Owner notification letters were mailed August 26, 2022. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA’s number for this recall is 2022080001.

 

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.nhtsa.gov.

 

Check if your Mercedes-Benz has a Recall

 


2022080001

Check the Transmission Wiring Harness

This is to notify you of the Recall Campaign Launch to check the transmission wiring harness on 1,168 Model Year (“MY”) 2020 GLC-Class (253 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 12, 2022.

 

Issue

Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has determined that on certain Model Year (“MY”) 2020 GLC-Class (253 platform) 4-Matic vehicles, the routing of the transmission wiring harness might not meet current production specifications.  In these vehicles, incorrect positioning of the transmission wiring harness could result in contact with the front drive shaft. Over time, chafing could potentially occur, and result in loss of vehicle propulsion while driving, which could potentially increase the risk of a crash. If the failure occurs, the driver would be made aware through a warning message in the instrument cluster.

 

What We’re Doing

MBUSA will conduct a voluntary recall.  An authorized Mercedes-Benz dealer will check the transmission wiring harness on the affected vehicles and replace it, if necessary.

 

Parts

The remedy is available and can be performed. Please note that the estimated replacement rate is less than 1%. Parts should only be ordered in the event a replacement is required.

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 MY20 GLC-Class vehicles covered by this notification until the vehicle has been repaired.

 

Customer Notification Timeline

Customer letters will be mailed on 8/26/2022.

 


Check transmission wiring harness, rework or replace if necessary

Model 253

 

Check/test procedure

  1. Remove rear engine compartment lining (A, Figure 1). For model 253, see AR61.20-P-1105LW.

 

  1. Check clearance (B, Figure 2) between transmission wiring harness, transmission tunnel and transmission.
    1. Transmission wiring harness is in contact but not damaged: Perform work procedure A.
    2. Transmission wiring harness is in contact and is damaged: Perform work procedure B.
    3. Transmission wiring harness is correctly routed: End measure.

 

Work procedure A

  1. For model 253 – Clip the wiring harness in at the correct bracket (C, Figure 3).

Unclip wire and retaining clamp, re-use retaining clamp on bracket (C, Figure 3).

It is not necessary to turn the red grommet for model 253.

 

Work procedure B

  1. Use the following procedure depending on the level of damage.
  • If only the protective hose is slightly scratched, wrap fabric tape around the affected position and then route the wiring harness correctly.
  • If one or more signal lines (line cross-section 0.35 mm² or 0.75 mm²) are damaged, these lines must be repaired using line connectors; to do this, sever the protective hose and, after the repair using the line connectors, connect the two ends of the protective hose with fabric tape and route the wiring harness correctly.
  • If the power supply line (line cross-section 10 mm²) is damaged, the wiring harness must be replaced.

 

Refer to WIS/Star Wiring for wire colors and the corresponding wire functions.

 

Primary Parts Information 

Qty. Part Name Part Number
As required* Fabric tape 25m roll A 007 989 07 85 08
As required* Line connectors A 000 982 92 10
As required* Transmission wiring harness model 253 left-hand drive A 253 540 89 21

 


Chronology :

In September 2020, Mercedes-Benz AG learned of an isolated customer complaint (outside the US) about propulsion loss while driving. No damages or personal injuries were reported. As of the date of this report, there have been no customer complaints or field reports of this phenomenon in the United States.

In October and November 2020, MBAG received similar complaints regarding GLC-Class (platform 253) vehicles and started an investigation.

In December 2020, MBAG implemented a production quality gate to double-check the wiring harness installations in the two plants that produce GLC-Class (platform 253) .

From January through March 2021, Mercedes-Benz began to receive similar complaints regarding E-Class (platform 213) vehicles. During the same period, new complaints were received regarding GLC-Class (platform 253). MBAG began to investigate possible commonalities between the reported failures of two different platforms that are manufactured at three different plants. MBAG also asked the wiring harness supplier to analyze any possible cause involving the wiring harness.

In late April 2021, MBAG ensured correct potential wiring harness installation by making adjustments to the manufacturing process for both platforms.

In the summer of 2021, MBAG continued investigations into the potential root cause, and the number of the potentially affected vehicles.

Investigations of the possible root cause, and potentially affected generations of transmissions vehicles continued into early 2022.

In February 2022, MBAG identified the root cause of the reported propulsion loss as an error in the installation of the wiring harness.

From March through June 2022, MBAG analyzed the potential effect of the transmission wiring harness production deviation on vehicle safety, and identified potentially affected vehicles.

On July 1st 2022, MBAG determined that a potential safety risk cannot be ruled out and decided to conduct a recall of potentially affected vehicles.

 


1 Affected Product

Vehicle

MAKE MODEL YEAR
MERCEDES-BENZ GLC350E 2020

 


11 Associated Documents

Defect Notice 573 Report

RCLRPT-22V494-4753.PDF 215.288KB

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Manufacturer Notices(to Dealers,etc)

RCMN-22V494-8681.pdf 140.108KB

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Recall Acknowledgement

RCAK-22V494-6054.pdf 645.151KB

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Remedy Instructions and TSB

RCRIT-22V494-4901.pdf 1069.783KB

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Manufacturer Notices(to Dealers,etc)

RCMN-22V494-7520.pdf 1191.459KB

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Recall 573 Report – August 12, 2022

RCLRPT-22V494-8662.PDF 215.292KB

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Recall 573 Report – August 26, 2022

RCLRPT-22V494-4038.PDF 215.291KB

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ISSUED Owner Notification Letter(Part 577)

RCONL-22V494-5001.pdf 388.439KB

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Recall Quarterly Report #1, 2022-3

RCLQRT-22V494-6827.PDF 211.136KB

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Recall Quarterly Report #2, 2022-4

RCLQRT-22V494-3871.PDF 211.236KB

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Recall Quarterly Report #3, 2023-1

RCLQRT-22V494-9273.PDF 211.324KB

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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=22V494&docType=RCL

 


 

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