P1285 GMC Cylinder head over temp sensed
Possible causes
Tech description
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 GMC Description
Indicates an engine overheat condition was sensed by the Cylinder Head Temperature (CHT) sensor.
GMC Vehicle:GMC Acadia,GMC Canyon,GMC Envoy,GMC Savana 1500,GMC Savana 2500,GMC Savana 3500,GMC Sierra 1500,GMC Sierra 2500 HD,GMC Sierra 3500 HD,GMC Terrain,GMC Yukon,GMC Yukon XL 1500,GMC Yukon XL 2500,