NHTSA service bulletin

NHTSA Service Bulletin 11032023: 2024-2026 Mazda Cx-70 Plug-in Hybrid

Official manufacturer communication context for 2024-2026 Mazda Cx-70 Plug-in Hybrid, with affected products, buyer checks and links into Carchieve recall, problem and VIN research.

NHTSA service bulletin 11032023 summary graphic for 2024-2026 Mazda Cx-70 Plug-in Hybrid
11032023NHTSA document ID
Warranty program / extensioncommunication type
2affected product rows
2source rows grouped

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

DESCRIPTION Some vehicles may experience one or more of the following DTCs with the Hybrid system warning light on. This may be caused by an issue with the sub battery located under the passenger floor. P143B Backup power supply system: Sub battery power supply low input. U3008:01 BPS Backup power supply unit input/output circuit over-current/voltage malfunction. U3003:17 BPS The output voltage sensor in the backup power supply unit detects that the voltage is standard or more. U04C0:00 PCM Backup power supply unit internal malfunction. REPAIR PROCEDURE 1. Remove the sub battery according to the instructions on MGSS. CX-90 (LEAD ACID BATTERY (SUB) REMOVAL/INSTALLATION) CX-70 (LEAD ACID BATTERY (SUB) REMOVAL/INSTALLATION) 2. Test the battery's voltage using a digital voltmeter (DVOM) and record the result on the warranty claim. NOTE: The DCA 8000 does not accurately test this small battery. You DO NOT need the DCA 8000 test printout for a warranty claim. 3. Install a new sub battery.

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
MazdaCx-70 Plug-in Hybrid2025, 2026Ask for service records and run the exact VIN before purchase.
MazdaCx-90 Plug-in Hybrid2024-2026Ask 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 11032023?

DESCRIPTION Some vehicles may experience one or more of the following DTCs with the Hybrid system warning light on. This may be caused by an issue with the sub battery located under the passenger floor. P143B Backup power supply system: Sub battery power supply low input. U3008:01 BPS Backup power supply unit input/output circuit over-current/voltage malfunction. U3003:17 BPS The output voltage sensor in the backup.

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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