# Service bulletin 07\-006\-25

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11023695
- Published by NHTSA: 2025\-10\-03
- Manufacturer's number: 07\-006\-25
- Manufacturer's date: 2025\-09\-25
- NHTSA component: UNKNOWN OR OTHER
- Manufacturer's system: Heater

## NHTSA's summary

Some customers may complain that the heater does not work properly and that a warning about a hybrid abnormality appears on the Instrument Cluster. Upon inspection, the vehicle may have DTC P0AA6:00 \(High voltage insulation malfunction: Decrease in vehicle insulation resistance\) stored in memory. This is caused by an inappropriate casting method of the water heater during the manufacturing process. To eliminate this concern, the casting method for the aluminum heat sink has been modified from low\-pressure to high pressure casting and a seal has been added to the sheath pipe opening in the circuit board compartment.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11023695-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11023695-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Trouble codes named

P0AA6

## Vehicles listed

- 2025 MAZDA CX\-70 PLUG\-IN HYBRID
- 2024 to 2025 MAZDA CX\-90 PLUG\-IN HYBRID

JSON: [/v1/bulletins/11023695](/v1/bulletins/11023695)

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