# Service bulletin LI54.10\-P\-080004

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: 11026830
- Published by NHTSA: 2025\-12\-24
- Manufacturer's number: LI54.10\-P\-080004
- Manufacturer's date: 2025\-12\-18
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

Complaint • Vehicle cannot be started • Warning in the instrument cluster related to High\-voltage on board electrical system • The following fault codes related to interlock can be found in the High Voltage Control units : • PTCU \(N127\) : P154700 \- There is a warning due to a detected fault in the interlock circuit. • BMS \(N82/9\) : P0A0B00 \- The interlock circuit of the high\-voltage on\-board electrical system has a malfunction. P0A0D00 \- The interlock circuit of the high\-voltage on\-board electrical system has a short circuit to positive. • DCB \(N116/5\): P0A0A00 \- The interlock circuit of the high\-voltage on\-board electrical system has an electrical fault. P0A0B00 \- The interlock circuit of the high\-voltage on\-board electrical system has a malfunction. P0A0C00 \- The interlock circuit of the high\-voltage on\-board electrical system has a short circuit to ground. • OBL \(N83/11\) : P0A0B00 \- The interlock circuit of the high\-voltage on\-board electrical system has a malfunction. P0A0C00 \- The interlock circuit of the high\-voltage on\-board electrical system has a short circuit to ground. Instrument cluster warning messages : Cause • Oxidation in interlock circuit pins of the low voltage connectors in the components • Twisted harness • Harness scratching with the body • Wiring harness chafed/cut at the ECUs • Broken interlock connector • Improperly connected HV connectors • Interlock pins on HV components are bent or deformed Important Note : • In case of interlock failures, the High\-voltage component is less likely to cause the issue. Remedy Remedy 1: Interlock loop resistance measurement \(Refer attachment "243 Interlock Resistance Measurements.pdf"\) Remedy 2: Additional check points for interlock issues

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11026830-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11026830-9999.pdf)

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

## Components

Electrical system

## Trouble codes named

P0A0A, P0A0B, P0A0C, P0A0D, P1547

## Vehicles listed

- 2023 to 2025 MERCEDES\-BENZ EQB 250\+
- 2022 to 2025 MERCEDES\-BENZ EQB 300 4MATIC
- 2022 to 2025 MERCEDES\-BENZ EQB 350 4MATIC

JSON: [/v1/bulletins/11026830](/v1/bulletins/11026830)

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