NHTSA service bulletin

NHTSA Service Bulletin 10199729: 2021 Mazda Cx-5

Official manufacturer communication context for 2021 Mazda Cx-5, with affected products, buyer checks and links into Carchieve recall, problem and VIN research.

NHTSA service bulletin 10199729 summary graphic for 2021 Mazda Cx-5
10199729NHTSA document ID
Manufacturer communicationcommunication type
2affected product rows
100/100quality 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

SSPC6 - 2021 CX-5 and CX-9 TELEMATICS COMMUNICATIONS UNIT (TCU) CONCERN: On certain subject 2021 MY CX-5 & CX-9 vehicles, the electronic control unit (ECU) may not enter the power-saving mode under certain conditions, and a dark current may continue to flow even after the engine is turned off. If the vehicle is left unused in this condition over several days, the battery may drain and cause a no-start issue. This is due to the inappropriate software of the Telematics Communication Unit (TCU). To eliminate this concern, the Telematics Communication Unit (TCU) software has been modified.

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-92021Ask 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 10199729?

SSPC6 - 2021 CX-5 and CX-9 TELEMATICS COMMUNICATIONS UNIT (TCU) CONCERN: On certain subject 2021 MY CX-5 & CX-9 vehicles, the electronic control unit (ECU) may not enter the power-saving mode under certain conditions, and a dark current may continue to flow even after the engine is turned off. If the vehicle is left unused in this condition over several days, the battery may drain and cause a no-start issue. This.

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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