P0634 GMC Transmission Control Module Overtemperature
Possible causes
– Obstructions in the airflow of the radiator or transmission cooler
– Kinked or damaged transmission fluid lines
– Damage to the transmission cooler
– Kinked or damaged transmission fluid lines
– Damage to the transmission cooler
Tech description
Check transmission fluid level and condition and replaced fluid if necessary.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P0634 GMC Description
The control solenoid (w/body and TCM) valve assembly has a built-in TCM temperature sensor to detect possible overtemperature conditions of the TCM. This fault indicates the TCM is in an overtemperature condition and the TCM has shut down to protect from possible heat damage to the TCM. TCM will remain off until the over temperature condition no longer exists.
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,