What does it mean?
P0634 is a Computer Output Circuit fault code. It indicates: PCM / ECM / TCM Internal Temperature Too High.
PCM / ECM / TCM Internal Temperature Too High
Severity
Medium
Can I keep driving?
Usually drivable, but get it diagnosed without delay.
How is this code read?
This is a standard OBD-II code; any basic scanner reads it on vehicles built after 2004.
- PPowertrain
- 0Generic code
- 6Computer Output
- 34Sequence number
Codes From the Same System
All Fault Codes- P0600Serial Communication Link Malfunction
- P0601Internal Control Module Memory Check Sum Error
- P0602Control Module Programming Error
- P0603Internal Control Module Keep Alive Memory (KAM) Error
- P0604Internal Control Module Random Access Memory (RAM) Error
- P0605Lack of proper voltage and or ground to the PCM, Defective PCM ROM memory module, Defective PCM ground circuit(s), Defective PCM controlled output devices
- P0606Internal Control Module Read Only Memory (ROM) Error
- P0607Control Module Performance
Related Similar Codes
- P0630VIN Not Programmed or Mismatch - ECM/PCM
- P0631VIN Not Programmed or Mismatch - TCM
- P0632Odometer Not Programmed - ECM/PCM
- P0633Immobolizer Key Not Programmed - ECM/PCM
- P0635Power Steering Control Circuit
- P0636Power Steering Control Circuit Low
- P0637Power Steering Control Circuit High
- P0638Throttle Actuator Control Range/Performance (Bank 1)
This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.