# Service bulletin 07\-001\-25b

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: 11016201
- Published by NHTSA: 2025\-04\-01
- Manufacturer's number: 07\-001\-25b
- Manufacturer's date: 2025\-03\-25
- NHTSA component: UNKNOWN OR OTHER
- Manufacturer's system: Air Conditioner

## NHTSA's summary

Some vehicles may exhibit check engine light turned on at engine startup, with DTC P0531:00 stored in memory. DTC P0531:00 \[PCM\] \- Refrigerant pressure sensor No.1 system: Function malfunction This is caused by improper control logic of the PCM and the dash\-electrical supply unit \(Dash\-ESU\). To eliminate this concern, the control logic of the PCM and the Dash\-ESU has been modified.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11016201-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11016201-9999.pdf)

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

## Trouble codes named

P0531

## Vehicles listed

- 2025 MAZDA CX\-70
- 2024 to 2025 MAZDA CX\-90

JSON: [/v1/bulletins/11016201](/v1/bulletins/11016201)

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