NHTSA Service Bulletin 11019637: 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 Instrument cluster warning lamp and/or warning message for brake system, EPB, ESP (yellow or red) and possibly 12 V battery (red) Different combinations of the following DTCs present in the ESP: B23AA77, B23AB77, B23D177 and in part (C100BE0, C100BE1, B23AA1B, B23D152) Cause Due to a reduction in resistance at the HV voltage divider, the DC/DC converter measures an incorrect HV voltage. Regulation of the 12 V output voltage therefore becomes unstable. I.e. the output voltage starts to fluctuate and the output current starts to jump instead of slowly regulating to the currently requested value. The EPB position is calculated by the voltage and the current. Since these fluctuate, the ESP control unit loses its position and sets the DTCs. Remedy Check of the DC/DC converter via XENTRY Diagnosis: Compare the serial number of the DC/DC converter with a list of potentially affected parts in XENTRY -> DC/DC converter N83/1 -> Special Processes. If the evaluation comes back as defective - Replace the DC/DC converter and inspect the EPB for Subsequent complaint, defect. If the evaluation comes comes back not affected: Actuate BUCK mode for approx. 30 s The output current normally jumps to a high value (e.g. 100 A) and then falls slowly to the current specified value e.g. 50 A and then only changes slowly and in small increments. In the event of this fault cause, the output current is subject to strong fluctuations/jumps (multiple 1-10 A) (see videos in attachment). In the event of strong fluctuations and the S/N not identified in the Special Process, please open a TIPS case and attach print out of DC/DC special procedure and buck mode actual values. Subsequent complaint, defect on the EPB: Check of the actuators and brake caliper piston Manually extend and retract the piston on the brake caliper completely using the suitable socket If the piston sticks at a certain point, the rotation force increases significantly If the brake caliper piston sticks, the brake caliper has to be replaced If the retaining ring of the actuator is broken, the actuator has to be replaced In XENTRY, edit the stored test instructions of the remaining DTCs
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 11019637?
Complaint Instrument cluster warning lamp and/or warning message for brake system, EPB, ESP (yellow or red) and possibly 12 V battery (red) Different combinations of the following DTCs present in the ESP: B23AA77, B23AB77, B23D177 and in part (C100BE0, C100BE1, B23AA1B, B23D152) Cause Due to a reduction in resistance at the HV voltage divider, the DC/DC converter measures an incorrect HV voltage. Regulation of the.
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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