NHTSA Service Bulletin 11025541: 2022-2025 Mercedes-benz Eqb 250+
Official manufacturer communication context for 2022-2025 Mercedes-benz Eqb 250+, with affected products, buyer checks and links into Carchieve recall, problem and VIN research.
Reviewed June 2026 from NHTSA manufacturer communication and service bulletin records. Carchieve is independent and not affiliated with any vehicle manufacturer or government agency.
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. 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
What this bulletin may mean before buying
Treat this as service research, not a verdict on one car. Before you buy, compare this communication with official recall campaigns, model-level owner complaint patterns, and the exact vehicle’s VIN-decoded specifications. A bulletin can help you ask a seller or dealer sharper questions about software updates, known repairs, warranty extensions and service history.
Affected products listed in this communication
Buyer checklist
- Run the 17-character VIN and confirm the year, make, model, engine and equipment match the listing.
- Check recall campaign pages for safety actions that may require dealer repair.
- Compare this bulletin with common problem pages for the same model and component area.
- Ask the seller or dealer whether the bulletin procedure, update or inspection has already been completed.
- Use the used-car buying checklist and get an independent inspection.
Frequently asked questions
What is NHTSA service bulletin 11025541?
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.
Is a service bulletin the same as a recall?
No. A recall is a safety campaign with a required remedy for affected VINs. A service bulletin or manufacturer communication usually describes diagnostic, repair, software, warranty or service information.
How should a used-car buyer use this bulletin?
Use it as a research signal. Compare it with recalls, owner complaints, service records, a VIN report and an independent inspection before buying.
Check the exact VIN before you buy
Model-level pages show public safety patterns. A full VIN report helps confirm the exact vehicle, decoded specs, recall applicability and buyer checks.
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