Check 48V Ground Connection – 2021-2023 Mercedes-Benz E-Class, CLS, & AMG GT

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February 9, 2024 NHTSA CAMPAIGN NUMBER: 24V100000

48-Volt Ground Cable Not Tightened Properly

An overheated ground cable increases the risk of a fire.


NHTSA Campaign Number: 24V100

Manufacturer Mercedes-Benz USA, LLC


Potential Number of Units Affected 12,191



Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2021-2023 CLS450, E450, E450 All-Terrain, AMG E53, AMG GT43, AMG GT53, and 2021 AMG CLS53 vehicles. The 48-volt ground cable connection located in the engine compartment may not be tightened properly and may result in the ground cable overheating.



Dealers will inspect the 48-volt ground cable connection and repair it as necessary, free of charge. Owner notification letters are expected to be mailed March 4, 2024. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA’s number for this recall is 2024MMNNNN.



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


Check if your Mercedes-Benz has a Recall


March 8, 2024


Check 48V Ground Connection

This is to notify you of the Recall Campaign Launch to check the 48V ground connection on 12,176 Model Year (“MY”) 2021-2023 E-Class, CLS, and AMG GT 4-Door (213, 257, and 290 platform) vehicles. The recall campaign will be visible on the website and may generate questions from customers. Affected VINs will be flagged in VMI as “OPEN” on March 8, 2024.



Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY 2021-2023 E-Class (213 platform), CLS (257 platform) and AMG GT 4-door (290 platform) vehicles, the 48V ground connection located in the engine compartment might not be tightened to the specified torque. In this case, the ground cable might not be correctly secured. Subsequently, the electric resistance at 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 bolt torque at the 48V ground connection on the affected vehicles and correct it, if necessary.



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 authorized Mercedes-Benz 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 March 22, 2024.


Customer Reimbursement

Customer reimbursement is not being offered for this campaign.


Check 48V Ground Connection

Vehicle option code B01 corresponds to 48 V technology.


Check/test Procedure

1. Disconnect ground line of 12 V battery.

2. Remove dust filter with air duct segment above 48 V battery.

For basic data, see AP83.00-P-8381C.

3. Perform visual check of ground point of 48 V battery (A, Figure 1) for thermal damage. If no damage is visible, disconnect the ground point.

Do NOT pull on the ground line. If the line was pulled, the ground connection must always be retightened, even if there is no damage.


Figure 2, Accessibility of ground screw connection of 48 V battery (W106/3)


4. Check the contact surfaces of the bolts, cable lug, and nut for damage. (Figure 3)

a. Thermal damage found in area of 48 V battery ground point (traces on contact surface of nut/cable lug/bolt): Carry out Work Procedure.

b. No damage present. Assemble in reverse order: End Measure.

Torque ground line to ground bolt 16 Nm.


Figure 3, examples of thermal damage (e.g. evidence of arcing, scorch marks, welding of the nut/cable lug/bolt), not OK pictures


Work Procedure


1. Replace 48 V battery ground line and replace M8 nut; install new bolt if necessary; remove 48 V battery if necessary.

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

Remove/install 48 V battery. For basic data, see AR54.10-P-0022LWO (model 213)  Remove/install 48 V battery. For basic data, see AR54.10-P-0022FR (models 257, 290)

Ensure routing without chafe marks (use Figure 1 for orientation).

Subsequently pulling on the line is strictly prohibited and may result in consequential damage.


Primary Parts Information

Qty. Part Name Part Number
As required (1) 48 V battery ground line A 213 540 28 70
As required (1) M8 nut N 000000 008271
As required (1) Ground bolt A 000 991 29 03

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 number for the California Proof of Correction is unique and must be entered as such (24V100), your dealer code, and the date of the repair, using a black permanent marker.


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 is unique and must be entered as such (24V100).


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Chronology :

In late 2022, MBAG became aware of isolated field reports in the US in which customers allegedly experienced various warning messages.

From late 2022 and into March 2023, MBAG investigated those reports, and based on these analyses, hypothesized that an insufficiently tightened ground connection for the 48V-battery-system could have contributed to the reported warning messages. However, the torque data from quality control testing during production indicated that the bolt torque of the ground connection in these vehicles were tightened in accordance with specifications.

In April 2023, out of an abundance of caution, MBAG added an additional step to its production process to check and re-tighten the ground connection for the 48V- battery system on all potentially affected production lines.

From April until July 2023, MBAG continued to investigate the disparity between the field reports of insufficient bolt torque and MBAG’s production testing data, including laboratory testing and production line audits. Based on its findings, MBAG determined that subsequent assembly steps could in some instances lead to a loosening of the ground connection. At that time, it was not possible for MBAG to identify the population of potentially affected models or model years.

Therefore, during the second half of 2023 and the beginning of 2024, MBAG analyzed worldwide field reports for conditions that could have resulted from a loose ground connection of the 48V-battery-system, and associated production data. These analyses allowed MBAG to identify potentially affected vehicle models and production dates.

On February 2, 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 3 field reports received on September 1, 2022, December 7, 2022, and December 12, 2022. MBAG is aware of no reports of property damage, fatalities, or injury related to this defect.


16 Affected Products


MERCEDES-BENZ CLS450 2021-2023
MERCEDES-BENZ E450 2021-2023


6 Associated Documents

Recall Acknowledgement

RCAK-24V100-6569.pdf 645.485KB


Defect Notice 573 Report

RCLRPT-24V100-6702.PDF 218.312KB


Manufacturer Notices(to Dealers,etc)

RCMN-24V100-0566.pdf 140.779KB

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Manufacturer Notices(to Dealers,etc)

RCMN-24V100-0838.pdf 142.576KB

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Manufacturer Notices(to Dealers,etc)

RCMN-24V100-0163.pdf 1103.73KB

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Remedy Instructions and TSB

RCRIT-24V100-4549.pdf 972.674KB

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Last update on 2024-05-18 / Affiliate links / Images from Amazon Product Advertising API

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