Check engine light turned on at engine startup, with DTC P0531:00 stored in memory

Bulletin number

07-004-24a

Component

Engine

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.

Owners of these vehicles have filed 68 complaints in the engine category.