# P0531 on the 2025 Mazda CX\-70

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

Nobody has written a description of this code yet.

## Bulletins for this model year that name P0531

- [11017478](https://open.wenmarpro.com/bulletins/11017478), 2025-05-02: Some vehicles may experience issues with the remote/timer air conditioners \(pre\-conditioning system\) not working, or not functioning after activation. NOTE: If DTC P0531 is present, see TSB 07\-001/25. This may be caused by improper control logic of the dash\-
- [11017477](https://open.wenmarpro.com/bulletins/11017477), 2025-05-02: 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.
- [11016201](https://open.wenmarpro.com/bulletins/11016201), 2025-04-01: 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.
- [11013564](https://open.wenmarpro.com/bulletins/11013564), 2025-02-04: \[TEMPORARILY SUSPENDED\] 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.
- [11013563](https://open.wenmarpro.com/bulletins/11013563), 2025-02-04: 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.
- [11012340](https://open.wenmarpro.com/bulletins/11012340), 2025-01-04: 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.
- [11005559](https://open.wenmarpro.com/bulletins/11005559), 2024-08-02: Some customers with a PHEV CX\-90 may report a warning light or a reported issue of A/C malfunction. Upon inspection, the technician will discover that the vehicle has the P0531 diagnostic trouble code set.