P1285 Cylinder head over temp sensed

Possible causes
  • Low engine coolant level.
  • Base engine concerns.
  • Engine cooling system concerns.
  • CHT sensor concern.
    • Tech notes
    On some applications when this fault occurs the Engine Temperature warning indicator will illuminate and/or force the temperature gauge to the full H (hot) zone. The warning indicator can be triggered by either grounding the engine temperature warning circuit when wired to the PCM, or by sending a PCM network message to the instrument cluster.
    Symptoms
    – Engine Light ON (or Service Engine Soon Warning Light)
    P1285 Description
    Indicates an engine overheat condition was sensed by the Cylinder Head Temperature (CHT) sensor.
    P1285 Information for specific makes
    P1285 BUICK
    P1285 CADILLAC
    P1285 CHEVROLET
    P1285 DODGE
    P1285 DODGE
    P1285 FORD
    P1285 GMC