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P0634 Severity
Identifying an OBD code is just the start of a complete diagnostic routine. Most trouble codes are caused by a sensor reporting a value that is out of range. Just replacing a sensor may not fix underlying issues. Be sure to understand the code, the part or system in your car that the code refers to, and the risks of delaying professional repair.
Proper diagnosis will save you time and money on unnecessary repairs.
Urgent codes indicate immediate action is necessary. These are urgent and significant malfunctions that can cause severe damage to the vehicle or harm the driver and passengers.
Some vehicles place the Transmission Control Module (TCM) inside the Transmission. Due to the potential for heat buildup inside the transmission, the TCM is equipped with its own temperature sensor. If the TCM detects that it is getting too hot, it will set P0634. It will also place the vehicle into "Limp Home Mode", limiting the amount of power available, to prevent further damage.
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OBD-II Code Transmission Control Module (TCM) failure is defined as a PCM/ECM/TCM Internal Temperature "A" Too High
Some vehicles place the Transmission Control Module (TCM) inside the Transmission. Due to the potential for heat buildup inside the transmission, the TCM is equipped with its own temperature sensor. If the TCM detects that it is getting too hot, it will set P0634. It will also place the vehicle into "Limp Home Mode", limiting the amount of power available, to prevent further damage.