Improperly Secured 48-Volt Ground Connection – 2019-2024 Mercedes-Benz GLE & GLS

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March 15, 2024 NHTSA CAMPAIGN NUMBER: 24V207000

Improperly Secured 48-Volt Ground Connection

An overheated ground connection can increase the risk of a fire.

 

NHTSA Campaign Number: 24V207

Manufacturer Mercedes-Benz USA, LLC

Components ELECTRICAL SYSTEM

Potential Number of Units Affected 116,020

 

Summary

Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2023-2024 GLE 350, 2020-2024 GLE 450, 2020-2023 GLS 580, GLE 580, 2019-2023 GLS 450, 2021-2023 Maybach GLS 600, AMG GLS 63, 2021-2024 AMG GLE 53, AMG GLE 53 Coupe, and AMG GLE 63 S vehicles. A 48-Volt ground connection under the passenger seat may not be secured properly, resulting in the ground connection overheating.

 

Remedy

Dealers will inspect and tighten the 48-Volt ground connection as necessary, free of charge. Owner notification letters are expected to be mailed May 14, 2024. 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.nhtsa.gov.

 

Check if your Mercedes-Benz has a Recall

 


April 12, 2024

2024040002

Check 48V Ground Connection under Passenger Seat

This is to notify you of the Recall Campaign Launch to check the 48V ground connection under the passenger seat on 116,020 Model Year (“MY”) 2019-2024 GLE and GLS (167 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 April 12, 2024.

 

Issue

Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain GLE and GLS (167 platform) vehicles, the 48V ground connection under the passenger seat might have become loose. In this case, the ground cable lug would not be secured correctly. Subsequently, the electric resistance of the connection might increase. In combination with the high electrical currents potentially flowing through this connection, the temperature in this area might increase. As a consequence, a risk of fire cannot be ruled out completely.

 

What We’re Doing

MBUSA will conduct a voluntary recall. An authorized Mercedes-Benz dealer will check the fastening of the ground connection on the affected vehicles and correct it, if necessary.

 

Parts

The remedy is available and can be performed.

 

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.

 

Customer Notification Timeline

Customer letters will be mailed on approximately May 3, 2024.

 

Customer Reimbursement

Customer reimbursement is being offered for this campaign.

 


Check 48V Ground Connection on Passenger Seat  

 

Check/Test Procedure

 

1. Place vehicle key outside of radio range.

2. Unscrew front passenger seat and tilt forward slightly (Figure 1).

Screw, front seat to vehicle floor: 50 Nm.

The front seat remains in the vehicle with the wiring harness connected.

For basic data, see AR91.10-P-1000ME.

 

3. Lift floor covering above ground point “W106/1” (Figure 2, A) for 48 V on-board electrical system battery.

4. Disconnect and check screw connection of electrical wiring harness of 48 V on-board electrical system battery of “W106/1” ground point on body (Figure 3).

Ensure 12 V on-board electrical system battery ground is still disconnected!

Inspect ground connection for traces of thermal overload or damage (Figure 4).

 

1. If traces of thermal overload or damage are present on the wiring harness at the “W106/1” ground point: Carry out Work Procedures A and B.

2. If traces of thermal overload or damage are not present on the wiring harness at the “W106/1” ground point:

Carry out Work Procedure B.

 

Work Procedure A

1. Replace electrical wiring harness from “W106/1” ground point to 48 V on-board electrical system battery (Figure 5).

Thoroughly clean area affected by thermal overload or damage.

If the ground bolt also displays traces of thermal overload or damage, the ground bolt must be replaced.

See AR60.00-P-0100A “Attach ground point to body” (please take the bolt part number from here).

If traces of thermal overload or damage are present on the surrounding component parts, such as the floor covering, these component parts must be replaced.

 

Work Procedure B

1. Connect electrical wiring harness of 48 V on-board electrical system battery to “W106/1” ground point.

Torque of screw connection, electrical wiring harness to “W106/1” ground point: 20 Nm.

Torque of screw connection, ground harness to 48 V on-board electrical system battery: 16 Nm.

During installation of the electrical wiring harness to the “W106/1” ground point, ensure the contact surface is clean and free of damage at connection points.

 

2. Assemble in reverse order.

 

3. Connect XENTRY Diagnosis.

 

4. Perform quick test and clear fault memory.

 

5. Disconnect XENTRY Diagnosis.

 

Primary Parts Information

Qty. Part Name Part Number
As required (1) Wiring Harness A 167 540 19 08

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.

 

The following step applies to California dealers only.

Apply Proof of Correction Label (A 000 584 54 13) to area identified in Figure 1. Fill in the blank areas of the label. The “Campaign No.” for the California Proof of Correction is unique and must be entered as such (24V207), your “Dealer Code”, and the “Date” of the repair, using a black permanent marker.

Note: Clean bonding surface prior to affixing label.

 

The following step applies to California dealers only.

Provide the owner with the completed and signed Proof of Correction Certificate (A 000 584 42 14) (Figure 2), after you scan a completed form and attach to the RO. The recall number for the California Proof of Correction Certificate is unique and must be entered as such (24V207).

 


Chronology of Defect/Noncompliance Determination Supplement for ODI 24-00855-30607-10

In June 2022, MBAG initiated an investigation of field reports from customers alleging that their 167 platform vehicles displayed battery-related warnings.

Based on an initial review of these field reports, MBAG hypothesized that insufficient tightening of the ground cable connection for the 48V ground connection under the front passenger seat during production rework could have contributed to the reported warning messages. In July and September 2022, MBAG initiated plant rework campaigns to tighten the ground cable connection in potentially affected vehicles that remained in MBAG’s control.

In September 2022, during the course of its worldwide product monitoring, MBAG identified additional field reports describing issues related to the subject 48V ground connection, however from vehicles that did not undergo rework of this ground connection during production.

From October 2022 through April 2023 MBAG conducted further investigations of worldwide field reports alleging conditions that could have resulted from a loose ground connection to analyze other processes or factors that could contribute to these occurrences. Additionally, between December 2022 and March 2023, MBAG conducted internal reviews of the assembly process for the 48V ground connection under the front passenger seat as well as the process for adjusting a bolted connection in a vehicle that did not meet torque specifications based on quality control testing during production. These analyses were not able to attribute the identified occurrence to any deviation in vehicle production or rework process or other systemic failure.

From April 2023 through January 2024, MBAG expanded its investigations of factors that could cause a loosening of this 48V ground connection. Based on this investigation, MBAG hypothesized that other mechanical rework operations in the physical proximity of, but unrelated to, this component could inadvertently potentially cause reduced torque.

From January to February 2024, MBAG reviewed the field situation and tried to identify a common systemic failure mechanism relating to rework operations on the subject vehicles. Ultimately, it was not possible to identify a conclusive connection between the observed field reports and the considered rework operations.

MBAG ultimately concluded that non-systemic influences from the assembly or rework process might impact the correct bolting of the ground connection. Based on this conclusion, potentially affected vehicles were identified.
On March 8, 2024, MBAG determined that a potential safety risk in the identified vehicle population cannot be ruled out and decided to conduct a recall.

MBAG is currently aware of 31 field reports regarding this topic received between August 2, 2022 to November 20, 2023.

MBAG is not aware of any reports of property damage, fatalities, crashes or injury related to this defect.

 


34 Affected Products

Vehicles

MAKE MODEL YEAR
MERCEDES-BENZ AMG GLE53 2021-2024
MERCEDES-BENZ AMG GLE63 S 2021-2024
MERCEDES-BENZ AMG GLS63 2021-2023
MERCEDES-BENZ GLE350 2023-2024
MERCEDES-BENZ GLE450 2020-2024
MERCEDES-BENZ GLE580 2020-2023
MERCEDES-BENZ GLS450 2019-2023
MERCEDES-BENZ GLS580 2020-2023
MERCEDES-MAYBACH GLS600 2021-2023

 


4 Associated Documents

Defect Notice 573 Report

RCLRPT-24V207-4244.PDF 219.97KB

 


Recall Acknowledgement

RCAK-24V207-5456.pdf 645.507KB

 


Chronology

RMISC-24V207-0115.pdf 82.754KB

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Manufacturer Notices(to Dealers,etc)

RCMN-24V207-0616.pdf 140.042KB

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Latest Recalls Documents

For the Latest and Most recent Recall Information Visit the link below…

https://www-odi.nhtsa.dot.gov/acms/cs/documentList.xhtml?docId=24V207&docType=RCL

 


 

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