Inspect Transmission Wiring Harness Routing – 2022-2023 Mercedes-Benz C-Class

June 30, 2023 NHTSA CAMPAIGN NUMBER: 23V462000

Loss of Drive Power

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

 

NHTSA Campaign Number: 23V462

Manufacturer Mercedes-BenzeBay logo USA, LLC

Components ELECTRICAL SYSTEM

Potential Number of Units Affected 8,178

 

Summary

Mercedes-BenzeBay logo USA, LLC (MBUSA) is recalling certain 2022-2023 C300 and 2023 AMG C43 vehicles. The transmission wiring harness may be the incorrect length, which can result in harness damage and a loss of drive power.

 

Remedy

Dealers will inspect and repair the transmission wiring harness routing, as necessary, free of charge. Owner notification letters are expected to be mailed August 29, 2023. Owners may contact MBUSA customer service at 1-800-367-6373.

 

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

 


August 4, 2023

2023070015

Inspect Transmission Wiring Harness Routing

This is to notify you of the Safety and Emissions Recall Campaign Launch to inspect the transmission wiring harness routing on 8,178 Model Year (“MY”) 2022-2023 C-Class (206 platform) vehicles. The recall campaign will be visible on the www.NHTSA.gov website and may generate questions from customers.  Affected VINs will be flagged in VMI as “OPEN” on August 4, 2023.

 

Issue

Mercedes-BenzeBay logo AG (“MBAG”), the manufacturer of Mercedes-BenzeBay logo vehicles, has determined that on certain Model Year (“MY”) 2022-2023 C-Class (206 platform) vehicles with 4MATIC, the length of the transmission wiring harness might not meet current specifications. In this case, the transmission wiring harness could chafe on the front drive shaft, which could potentially damage the wiring harness and result in a loss of vehicle propulsion. This might increase the risk of a crash.  If the failure occurs, the driver would be made aware through a warning message (e.g. “Transmission Malfunction Stop”, “Drive Malfunction Stop Restart Vehicle”, “Drive Malfunction Stop Contact Dealer”, or “Service Required Do Not Change Transmission Position”) in the instrument cluster.

 

What We’re Doing

MBUSA will conduct a voluntary recall. An authorized Mercedes-BenzeBay logo dealer will inspect the transmission wiring harness routing on the affected vehicles and rework it, if necessary.

 

Parts

The remedy is available and can be performed. The approximate replacement rate of the wiring harness is less than 1%. Do not order parts before inspection is complete.

 

Given this notice, it is a violation of Federal law for a dealer to sell or lease any new 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 NetStar VMI and Xentry Portal. 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 vehicles covered by this notification until the vehicle has been repaired.

Notice to California Dealers: As required by 13 CCR 2117, a proof of correction (“POC”) certificate showing that the vehicle has been repaired under this recall must be issued by the dealer, and that such a certificate may be required by California as a condition of vehicle re-registration or operation.  Please reference this POC in the attached work instructions.  Failure to complete this step may result in fines and penalties and lead to customer dissatisfaction.

 


Inspect Transmission Wiring Harness Routing

Test Procedure

 

  1. Remove rear engine compartment lining (A, Figure 1). For basic information, see AR61.20-P-1105WT.

 

  1. Check routing and clearance (B, Figure 2) between the electrical wiring harnesses and the transmission tunnel/drive shaft, and the transfer case for the front axle differential.

The electrical wiring harnesses must not contact the drive shaft or the transfer case for the front axle differential!

 

a. If the electrical wiring harness is in contact but not damaged: Carry out Work Procedure 1.

b. If the electrical wiring harness is in contact and is damaged: Carry out Work Procedure 2.

c. If the electrical power supply line (3, Figure 3) (Cable cross section 10 mm²) is damaged: Carry out Work Procedure 3 .

d. If the electrical wiring harness is routed correctly:

End measure.

 

Work Procedure 1

The electrical wiring harness is in contact but not damaged!

 

  1. Cut cable tie at first clip (5, Figure 4).

 

  1. Adjust length of electrical wiring harnesses between red grommet (1, Figure 4) to first clip (5, Figure 4) as shown. The length must between 90 mm and max. 100 mm. The electrical wiring harnesses may not be in contact!

 

  1. Fasten both electrical wiring harnesses to the first clip with a new cable tie (5, Figure 4).

Check whether both electrical wiring harnesses are in contact at a different location. If so, carry out further corrective measures.

The electrical wiring harness may not be in contact at any point!

 

  1. Assemble in reverse order.

 

Work Procedure 2

If the electrical wiring harness is in contact and is damaged.

 

Carry out the following procedure:

 

If only the protective hose is slightly damaged:

  1. Wrap fabric tape around affected area.

 

  1. Route the electrical wiring harness (2, Figure 5) correctly as shown.

The electrical wiring harness (2, Figure 5) may not be in contact at any point!

 

  1. Assemble in reverse order.

 

If one or more of the electrical signal lines (cable cross section 0.35 mm² or 0.75 mm²) in the electrical wiring harness (2, Figure 5) are damaged:

 

  1. Repair the affected electrical signal line (cable cross section 0.35 mm² or 0.75 mm²) in the electrical wiring harness (2, Figure 5) using a line connector.

For basic information, see AR00.19-P-0100A.

To do this, cut the protective hose and, once repaired, connect the two ends of the protective hose with fabric tape by means of line connectors.

 

  1. Route electrical wiring harness (2, Figure 5) correctly as shown.

The electrical wiring harness (2, Figure 5) may not be in contact at any point!

 

  1. Assemble in reverse order.

 

Work Procedure 3

If the electrical power supply line (3, Figures 6 and 7) (cable cross section 10 mm²) is damaged, replace electrical supply line (3, Figures 6 and 7):

 

Use the following procedure to do this:

 

  1. Disconnect ground line of battery of 12 V on-board electrical system. For basic information, see AR54.10-P-0051WT.

 

  1. Remove protective metal sheet (4, Figure 6).

 

  1. Disconnect electrical power supply line (3, figure 6) from electrical connector.

 

  1. Remove front floor covering on the passenger side.

For basic information, see AR68.80-P-0008WT.

 

  1. Remove electrical power supply line (3, Figures 6 and 7) with grommet (1, Figures 6 and 7).

 

  1. Replace electrical power supply line (3, Figures 6 and 7).

The electrical wiring harness may not be in contact at any point!

 

  1. Assemble in reverse order.

 

Primary Parts Information

Qty. Part Name Part Number
As required (1)***Fabric tape 25 m rollA 007 989 07 85 08
As requiredLine connector**
As requiredCable tieA 000 995 25 94
As required (1)*Model 206 transmission wiring harness*
As required (1)*Model 206 transmission wiring harness (Code M254+421+(550/554) +

(M005)

*

* The required transmission wiring harness can be found in the Xentry parts process under the main group 54 ELECTRICAL EQUIPMENT AND INSTRUMENTS in Picture chart 545 – Picture number 700.

** The required line connector can be found in the Xentry parts process under the main group 54 ELECTRICAL EQUIPMENT AND INSTRUMENTS in Picture chart 019 contacting parts.

*** One 25 m roll of fabric tape is sufficient for at least 10 vehicles.

Small parts such as screws, lock nuts, sealing rings, cable ties, fluids, sealant, etc. are not listed in the parts list. The required small parts are taken into account in the budgeting.

 


Chronology :

In September 2022, MBAG initiated investigations into an individual field report outside the US describing the vehicle’s transmission erroneously shifting into neutral. No crash, personal injury, or third party damages were reported in connection with this field report. The vehicle was inspected and repaired at a local dealership.

Based on the report, MBAG commenced an investigation to determine the root cause of the issue. Together with the local supplier, MBAG evaluated the tolerances of several wiring harnesses and found that the dimension of some transmission wiring harnesses slightly exceeded the specified tolerance range.

In November 2022, MBAG received a field report in the US involving a customer vehicle that triggered the check engine light. Based on this information, MBAG investigated whether the report could relate to the length of the wiring harness.

In February 2023, MBAG expanded its investigation to assess the potential consequences of chafing to the wiring harness on the front drive shaft.

In April 2023, MBAG expanded its investigation further to consider additional field reports to determine the extent of effects caused by chafing of the wiring harness. The analyses also limited the out-of-specification wiring harnesses to specific production batches. Subsequently, MBAG used this information to determine the potentially affected vehicle population equipped with the out-of-specification wiring harnesses.

On June 23, 2023, MBAG determined that a potential safety risk cannot be ruled out and decided to conduct a recall.

MBAG is currently aware of 1 field report in the US received on November 15, 2022. MBAG has not received any reports of crashes, injuries, deaths or property damage associated with this issue.

 


3 Affected Products

Vehicles

MAKEMODELYEAR
MERCEDES-BENZeBay logoAMG C432023
MERCEDES-BENZeBay logoC3002022-2023

 


6 Associated Documents

Recall Acknowledgement

RCAK-23V462-9228.pdf 645.233KB

 


Defect Notice 573 Report

RCLRPT-23V462-3630.PDF 215.811KB

 


Manufacturer Notices(to Dealers,etc)

RCMN-23V462-8863.pdf 140.54KB

 


Remedy Instructions and TSB

RCRIT-23V462-4564.pdf 879.818KB

 


Manufacturer Notices(to Dealers,etc)

RCMN-23V462-4292.pdf 929.579KB

 


Remedy Instructions and TSB

RCRIT-23V462-8321.pdf 1002.785KB

 


Latest Recalls Documents

https://www-odi.nhtsa.dot.gov/acms/cs/documentList.xhtml?docId=23V462&docType=RCL

 


 

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