# Service bulletin LI46.10\-P\-078012

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11035120
- Published by NHTSA: 2026\-07\-21
- Manufacturer's number: LI46.10\-P\-078012
- Manufacturer's date: 2026\-07\-17
- NHTSA component: STEERING; ELECTRICAL SYSTEM

## NHTSA's summary

Complaint Hand detection system – malfunction / vehicles with code 266 Fault message in instrument cluster: "Active Emergency Stop Assist not available" "Active Lane Keeping Assist not available" "Active steering assist not available" Cause Possible causes: Hand detection mat, hand detection control unit, contacts, and electrical feed line. Remedy In the event of a customer complaint and fault code in IDC control unit: U186B29 in IDC223 or fault code U0429E0, U042941, U042929, U042902, U0429E1 in IDC213 or fault code in HOSWD control unit: B1E7614 Check: Please do not replace the HOSWD control unit. Please flash the new SW and perform the SCN coding for the HOSWD control unit \(N179/1\) \(available from July 2026\). The software can be flashed onto all HOSWD213 with HW number A0009011522 and all HOSWD223 with HW number A0009011422. Please also flash the SW for the IDC control unit \(N62/4\), if possible \(only applies to HOSWD223\). Erase fault memory Remedy: Turn on the ignition or start the engine without touching the steering wheel. If, after 10 seconds without touching the steering wheel, one of the three fault messages appears on the instrument cluster: Check the contacts and feed lines in the steering wheel by means of a visual inspection for damage, crimp connections, loose connections, etc. \(example in picture 2 and 3\). If there is visible damage \-\> replace the steering wheel electronics or the feed lines. If there is not any visible damage \-\> replace the steering wheel rim. If a yellow message does not appear on the instrument cluster within 10 seconds: Grasp the steering wheel fully with both hands, including the chrome molding at the 6 o'clock position \(see picture 1\). If the fault is triggered by grasping the steering wheel rim or pressing the clip at the 6 o'clock position, check the contacts and feed lines in the steering wheel by means of a visual inspection for damage, kinked connections, loose connections, etc. \(example in picture 2 and 3\). Check the ground connections \(screw connections and cables to the steering wheel rim\); if necessary, retighten the screws/bolts and check for corrosion \(picture 4\). If there is visible damage \-\> replace the steering wheel electronics or the feed lines. If there is not any visible damage: Replace the steering wheel rim. Please do not replace the HOSWD control unit. A TIPS case should be created if fault profile is unclear. In the event of a customer complaint and a further fault code in HOSWD: B1E7713: Check the ground connections \(screw connections and cables to the steering wheel rim\); if necessary, retighten the screws/bolts and check for corrosion \(picture 4\). B1F1F04: Check the control unit of the hand detection system; if necessary, replace this with the control unit from a donor vehicle \(make sure that the hardware part numbers are identical\).

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11035120-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11035120-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system, Steering

## Trouble codes named

B1E76, B1E77, B1F1F, U0429, U186B

## Vehicles listed

- 2020 to 2021 MERCEDES\-BENZ A 220
- 2020 to 2021 MERCEDES\-BENZ AMG A35
- 2020 MERCEDES\-BENZ AMG A35 4MATIC
- 2020 to 2021 MERCEDES\-BENZ AMG CLA35
- 2020 MERCEDES\-BENZ AMG CLA35 4MATIC
- 2020 to 2021 MERCEDES\-BENZ AMG CLA45
- 2020 MERCEDES\-BENZ AMG CLA45 4MATIC
- 2020 to 2021 MERCEDES\-BENZ AMG CLS53
- 2020 to 2021 MERCEDES\-BENZ AMG E53
- 2021 MERCEDES\-BENZ AMG E53 S
- 2020 to 2021 MERCEDES\-BENZ AMG E63
- 2020 to 2021 MERCEDES\-BENZ AMG E63S
- 2021 MERCEDES\-BENZ AMG GLA35
- 2020 to 2021 MERCEDES\-BENZ AMG GLA45
- 2020 to 2021 MERCEDES\-BENZ AMG GLB35
- 2021 MERCEDES\-BENZ AMG GLE53
- 2021 MERCEDES\-BENZ AMG GLE53 COUPE
- 2020 to 2021 MERCEDES\-BENZ AMG GLE63
- 2021 MERCEDES\-BENZ AMG GLE63 S
- 2021 MERCEDES\-BENZ AMG GLE63 S COUPE
- 2020 to 2021 MERCEDES\-BENZ AMG GLS63
- 2020 to 2021 MERCEDES\-BENZ AMG GT43
- 2020 to 2021 MERCEDES\-BENZ AMG GT53
- 2020 to 2021 MERCEDES\-BENZ AMG GT63
- 2020 to 2021 MERCEDES\-BENZ AMG GT63S
- 2020 to 2021 MERCEDES\-BENZ CLA 250
- 2020 to 2021 MERCEDES\-BENZ CLS 450
- 2020 to 2021 MERCEDES\-BENZ E 350
- 2020 to 2021 MERCEDES\-BENZ E 450
- 2020 to 2021 MERCEDES\-BENZ GLA 250
- 2021 MERCEDES\-BENZ GLA 250 4MATIC
- 2020 to 2021 MERCEDES\-BENZ GLB 250
- 2020 to 2021 MERCEDES\-BENZ GLB 250 4MATIC
- 2020 to 2021 MERCEDES\-BENZ GLE 350
- 2021 MERCEDES\-BENZ GLE 350 4MATIC
- 2021 MERCEDES\-BENZ GLE 350 4MATIC COUPE
- 2020 to 2021 MERCEDES\-BENZ GLE 450
- 2021 MERCEDES\-BENZ GLE 450 4MATIC
- 2021 MERCEDES\-BENZ GLE 450 4MATIC COUPE
- 2020 to 2021 MERCEDES\-BENZ GLE 580
- 2021 MERCEDES\-BENZ GLE 580 4MATIC
- 2021 MERCEDES\-BENZ GLE 580 4MATIC COUPE
- 2020 MERCEDES\-BENZ GLS 450
- 2020 MERCEDES\-BENZ GLS 580 4MATIC
- 2021 MERCEDES\-BENZ GLS450
- 2021 MERCEDES\-BENZ GLS580
- 2021 MERCEDES\-BENZ S 500
- 2021 MERCEDES\-BENZ S 580
- 2021 MERCEDES\-MAYBACH GLS 600
- 2021 MERCEDES\-MAYBACH S 580

## Recalls for the same vehicles and component

- [24V445000](/recalls/nhtsa/24V445000.md), 2024-06-14: ELECTRICAL SYSTEM:WIRING
- [2024081](/recalls/tc/2024081.md), 2024-02-09: Electrical
- [24V100000](/recalls/nhtsa/24V100000.md), 2024-02-09: ELECTRICAL SYSTEM:WIRING
- [2022397](/recalls/tc/2022397.md), 2022-07-22: Electrical
- [22V533000](/recalls/nhtsa/22V533000.md), 2022-07-22: ELECTRICAL SYSTEM:WIRING
- [22V365000](/recalls/nhtsa/22V365000.md), 2022-05-20: COMMUNICATION: AUTO CRASH NOTIFICATION; ELECTRICAL SYSTEM:SOFTWARE
- [21V354000](/recalls/nhtsa/21V354000.md), 2021-05-14: BACK OVER PREVENTION: SENSING SYSTEM: CAMERA; ELECTRICAL SYSTEM:SOFTWARE
- [21V217000](/recalls/nhtsa/21V217000.md), 2021-03-26: ELECTRICAL SYSTEM:WIRING; ELECTRICAL SYSTEM:STARTER ASSEMBLY
- [21V058000](/recalls/nhtsa/21V058000.md), 2021-02-05: ELECTRICAL SYSTEM:SOFTWARE; COMMUNICATION: AUTO CRASH NOTIFICATION
- [20V395000](/recalls/nhtsa/20V395000.md), 2020-07-06: ELECTRONIC STABILITY CONTROL \(ESC\); ELECTRICAL SYSTEM:SOFTWARE

## Other bulletins for the same vehicles and component

- [LI46.10\-P\-080896](/bulletins/11038188.md), 2026-10-06, Service bulletin: STEERING. Complaint Slight creaking noises when steering. Cause Noises may come from one or more sleeves of the horn contact plate. Remedy Remove the horn contact plate and check the sleeves for noise; see attached video. If necessary, apply lubricant to the sleeves.
- [LI54.21\-P\-080326](/bulletins/11037732.md), 2026-10-02, Service bulletin: ELECTRICAL SYSTEM. Complaint CEL light on with no drivability concerns. Cause Signal timing error. Remedy 167, 465: SW has been released. Update the FSAM to the latest SW version. 290, 118, 243, 247: Software is still in development. This fault code does not cause a drivability concern and will clear itself within 2‑ 3 key cycles. The vehicle can be released back to the customer.
- [LI46.35\-P\-067339](/bulletins/11037228.md), 2026-09-09, Service bulletin: STEERING. Complaint During part of the steering movement, it feels heavier or more difficult to steer in the same spot every time. OR Rattling, humming, dry sliding/gravel noise from the electric steering system when steering \(see attachment\). Complaint does not impact the ability to safely steer or control the vehicle. Cause Ball screw drive \(KGT\) of electric steering damaged by: 1. External force due to: ‑ Hitting the curb/posts with the front wheels. ‑ Driving over obstacles \(e.g. pothole/ threshold/ speed bump/ gully\) at an inappropriate speed. 2. Corrosion/ water ingress through a damaged boot \(see attachment\). ‑ Cracks \(1\) ‑ High pressure cleaner \(2\) ‑ Animal bite \(3\) See various examples listed in the attachments for examples of outside influence. Remedy Remove boot clamps closest to steering gear housing on both left and right \(as seen in "Steering Rack Boot Clamp Location"\). Pull back boot and inspect for rust, broken end stops, water, or any other anomalies. Replace electric steering. Note: Steering gears replaced due to outside influence or damage must not be claimed under warranty\!
- [LI54.65\-P\-080132](/bulletins/11036142.md), 2026-08-12, Service bulletin: ELECTRICAL SYSTEM. Complaint 1. General Diagnostic Tips 2. One or More PARK Sensor Activations 3. Red Ring Around Vehicle 4. "Active Parking and Parking Assist Inoperative" on Instrument Cluster 5. Cameras 6. Other Park Topics. Cause Various root causes Remedy See attached diagnostic guide.
- [LI54.21\-P\-080326](/bulletins/11035217.md), 2026-07-24, Service bulletin: ELECTRICAL SYSTEM. Complaint CEL light on with no drivability concerns. Cause Signal timing error. Remedy 167, 465: SW has been released. Update the FSAM to the latest SW version. 290, 118, 243, 247: Software is still in development. This fault code does not cause a drivability concern and will clear itself within 2\-3 key cycles. The vehicle can be released back to the customer.
- [LI00.20\-P\-077615](/bulletins/11034538.md), 2026-07-06, Service bulletin: ELECTRICAL SYSTEM. Complaint 1. "Perform vehicle handover" in the workshop menu to start the maintenance computer for service A/B cannot be carried out. 2. Service confirmation is not possible because "Perform vehicle handover" is displayed. This cannot be carried out. 3. The service display in the instrument cluster permanently displays 365 days \(remaining time\) and does not change. Cause Routine change in the software in N133/1 \(instrument cluster\) or A26/17 \(MBUX multimedia system and instrument cluster \(head unit\)\). Vehicle handover was not performed. Remedy For model series 290 AMG up to and including AEJ 22 and model series 167 up to and including AEJ 21/2, the following applies: Manually commission already\-installed instrument cluster control unit N133/1 and then perform special procedure to re\-initialize ASSYST data in N127 powertrain control unit. The following applies to model series 167 from AEJ 22/1 onward, 192 AMG, 206, 214, 223, 232 AMG, 236, 254, 290 AMG from AEJ 23 onward, 294, 295, 296, 297 and 465: Reinitialize ASSYST Plus under Adaptations – Teach\-in processes – ASSYST PLUS in control unit N133/1 \(instrument cluster\) or A26/17 \(MBUX multimedia system and instrument cluster \(head unit\)\), and then perform the special procedure for reinitializing the ASSYST data in powertrain control unit N127.
- [LI54.21\-P\-080326](/bulletins/11034506.md), 2026-07-06, Service bulletin: ELECTRICAL SYSTEM; ENGINE. Complaint CEL light on with no drivability concerns. Cause Signal timing error. Remedy 167: SW has been released. Update the FSAM to the latest SW version. 465, 290, 118, 243, 247: Software is still in development. This fault code does not cause a drivability concern and will clear itself within 2\-3 key cycles. The vehicle can be released back to the customer.
- [LI00.20\-P\-080703](/bulletins/11033855.md), 2026-06-16, Service bulletin: ELECTRICAL SYSTEM. Complaint Service code B1 displayed in the customer menu does not match the workshop code displayed in the workshop menu, e.g., 505 or 550A, which includes a service A. Cause The root cause is currently being investigated. Remedy To determine the cause, the instrument cluster control unit \(N133/1\) and powertrain control unit \(N127\) logs are required before confirming the service or correction using XENTRY Diagnosis. Please open a TIPS case to BCE inbox with the requested information in the attachments.
- [LI00.20\-P\-077615](/bulletins/11033852.md), 2026-06-16, Service bulletin: ELECTRICAL SYSTEM. Complaint 1. "Perform vehicle handover" in the workshop menu to start the maintenance computer for service A/B cannot be carried out. 2. Service confirmation is not possible because "Perform vehicle handover" is displayed. This cannot be carried out. 3. The service display in the instrument cluster permanently displays 365 days \(remaining time\) and does not change. Cause Routine change in the software in N133/1 \(instrument cluster\) or A26/17 \(MBUX multimedia system and instrument cluster \(head unit\)\). Vehicle handover was not performed. Remedy For model series 290 AMG up to and including AEJ 22 and model series 167 up to and including AEJ 21/2, the following applies: Manually commission already\-installed instrument cluster control unit N133/1 and then perform special procedure to re\-initialize ASSYST data in N127 powertrain control unit. For model series 167 as of AEJ 22/1, 192 AMG, 206, 214, 232 AMG, 236, 254, 290 AMG as of AEJ 23, 294, 295, 296, 297 and 465, the following applies: Reinitialize ASSYST Plus under Adaptations – Teach\-in processes – ASSYST PLUS in control unit N133/1 \(instrument cluster\) or A26/17 \(MBUX multimedia system and instrument cluster \(head unit\)\), and then perform the special procedure for reinitializing the ASSYST data in powertrain control unit N127.
- [LI82.85\-P\-080507](/bulletins/11033185.md), 2026-06-02, Service bulletin: ELECTRICAL SYSTEM. Complaint After successful commissioning of the HERMES control unit \(N112/9\) with XENTRY Diagnosis DVD 03/2026, the message "SOS \- service not activated" appears on the instrument cluster. In addition, the following two conditions are also met: • HERMES \(N112/9\) control unit: event code B15CE00 is ACTIVE and STORED \(A\+S\) • Vehicle Documentation System: For the HERMES control unit, the EID1, EID2, ICCID, IMEI, IMSI, TELNR fields in the "Identification/Serial number" column have the value "\-" Cause Still under analysis Remedy Recommission the HERMES control unit \(N112/9\) with XENTRY Diagnosis 03/2026 and add\-on 33399 installed or carry out the procedure with a newer version of XENTRY Diagnosis: XENTRY→ "N112/9 \- Control unit for telematics services \(HERMES\)" \-\> "Adaptations" \-\> "Control unit commissioning" \-\> "Commissioning of previously installed control unit"

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