# Service bulletin LI54.71\-P\-080157

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: 11029088
- Published by NHTSA: 2026\-02\-28
- Manufacturer's number: LI54.71\-P\-080157
- Manufacturer's date: 2026\-02\-27
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

Complaint Driver assistance system warning messages in instrument cluster. MUST be in conjunction with a fault code in control unit N62/5 IDC \(driver assistance systems\): • B1D9198 \(Stored\) \- The "Driver assistance system" control unit is malfunctioning. Overtemperature in the component or system. Under certain circumstances, additional fault codes may be present in N125 CDCC\_EV \(central controller for charging and driving\). Cause Air in the low\-temperature circuit Remedy 1. Do not replace any parts 2. Perform a leak test on the low\-temperature circuit 3. Perform a visual check of the coolant connection on the N62/5 control unit 4. Perform the bleeding routine via XENTRY and WIS. 5. Check the coolant level and top up if necessary \(see WIS references\) If this does not remedy the problem, please open a TIPS case to Body/Chassis/Entertainment.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11029088-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11029088-9999.pdf)

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

## Components

Electrical system

## Trouble codes named

B1D91

## Vehicles listed

- 2026 MERCEDES\-BENZ CLA 250\+ \(EV\)
- 2026 MERCEDES\-BENZ CLA 350 4MATIC \(EV\)

JSON: [/v1/bulletins/11029088](/v1/bulletins/11029088)

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