NHTSA service bulletin

NHTSA Service Bulletin 11021802: 2022-2025 Mercedes-benz Amg Eqs

Official manufacturer communication context for 2022-2025 Mercedes-benz Amg Eqs, with affected products, buyer checks and links into Carchieve recall, problem and VIN research.

NHTSA service bulletin 11021802 summary graphic for 2022-2025 Mercedes-benz Amg Eqs
11021802NHTSA document ID
Manufacturer communicationcommunication type
13affected product rows
90/100quality score

Reviewed June 2026 from NHTSA manufacturer communication and service bulletin records. Carchieve is independent and not affiliated with any vehicle manufacturer or government agency.

Quick answer

Complaint: Red 12 V battery warning message in IC DTC stored in EZS or currently: B161609 No DTC in DC/DC converter DC/DC converter is not providing any output voltage or output current 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 is therefore unstable or turns off. Remedy: Check of the DC/DC converter via XENTRY Diagnosis Actuate BUCK mode for approx. 40 s Normally, the output current will jump up to a high value (e.g. 100 A) and then slowly drop to the current specified value (e.g. 50 A) and then only change slowly and in small increments (video in attachment). In the event of this error cause, the DC/DC converter may react in two possible ways: 1) Despite displayed BUCK mode, the DC/DC converter does not provide any output voltage or output current (video in attachment). 2) The output voltage and output current may experience significant fluctuations/jumps (several 1-10 A) (video in attachment). Perform in XENTRY -> DC/DC converter N83/1 -> Special procedures -> "Evaluation of the HV resistance reduction of the DC/DC converter control unit". The special procedure compares the serial number of the installed DC/DC converter with the list of potentially affected parts. Depending on the result: If the serial number can be found in the list of potentially affected component parts, then replace the DC/DC converter. If the serial number cannot be found in the list of potentially affected parts but the problem described applies, then please open a TIPS case and forward to HQ.

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

MakeModelModel yearsBuyer note
Mercedes-benzAmg Eqs2022-2024Ask for service records and run the exact VIN before purchase.
Mercedes-benzAmg Eqs 532022, 2023Ask for service records and run the exact VIN before purchase.
Mercedes-benzAmg Eqs 53 4matic2023, 2024Ask for service records and run the exact VIN before purchase.
Mercedes-benzEqs 4502022Ask for service records and run the exact VIN before purchase.
Mercedes-benzEqs 450 4matic2023, 2024Ask for service records and run the exact VIN before purchase.
Mercedes-benzEqs 450+2022-2024Ask for service records and run the exact VIN before purchase.
Mercedes-benzEqs 5802022-2024Ask for service records and run the exact VIN before purchase.
Mercedes-benzEqs 580 4matic2022, 2023Ask for service records and run the exact VIN before purchase.
Mercedes-benzEqs SUV 450 4matic2023-2025Ask for service records and run the exact VIN before purchase.
Mercedes-benzEqs SUV 450+2023-2025Ask for service records and run the exact VIN before purchase.
Mercedes-benzEqs SUV 580 4matic2023-2025Ask for service records and run the exact VIN before purchase.
Mercedes-benzRedundant Eqs 4502023, 2024Ask for service records and run the exact VIN before purchase.
Mercedes-maybachEqs SUV 680 4matic2024, 2025Ask for service records and run the exact VIN before purchase.

Buyer checklist

  1. Run the 17-character VIN and confirm the year, make, model, engine and equipment match the listing.
  2. Check recall campaign pages for safety actions that may require dealer repair.
  3. Compare this bulletin with common problem pages for the same model and component area.
  4. Ask the seller or dealer whether the bulletin procedure, update or inspection has already been completed.
  5. Use the used-car buying checklist and get an independent inspection.

Frequently asked questions

What is NHTSA service bulletin 11021802?

Complaint: Red 12 V battery warning message in IC DTC stored in EZS or currently: B161609 No DTC in DC/DC converter DC/DC converter is not providing any output voltage or output current 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 is therefore unstable or turns off. Remedy: Check of the DC/DC converter.

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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