PowertrainP0634
SeriousSeverity: Serious - have it checked soon
Control Module Internal Temperature A Too High
Key terms: Control module: a small computer that runs one part of the car · SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions
1What it means in plain English
The engine computer or one of its output circuits has a fault.
2Common causes
- Engine control module fault
- Power or ground connection problem
- Low battery or charging voltage
- Wiring short or open circuit
- Software or memory fault
3Can I drive?
If the engine runs normally, drive carefully to a workshop for diagnosis. If it runs badly, stalls, or will not restart, have the car towed.
This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.
4Brand data 31
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0634 | Control Module Internal Temperature A Too High SAE | Powertrain |
| BAIC Motor | P0634 | PCM/ECM/TCM Internal Temperature Too High Brand | Powertrain |
| Mercedes-Benz | P0634 | Control Module Internal Temperature A Too High SAE | Powertrain |
| BYD | P0634 | PCM/ECM/TCM Internal Temperature Too High Brand | Powertrain |
| Chery | P0634 | V5V overtemperature Brand | Powertrain |
| Chrysler | P0634 | RBM fault Brand | Powertrain |
| Daewoo | P0634 | PCM/ECM/TCM Internal Temperature Too High Brand | Powertrain |
| DFFS | P0634 | V5V overtemperature fault Brand | Powertrain |
| DFFX | P0634 | PCM/ECM/TCM Internal Temperature Too High Brand | Powertrain |
| DFXK | P0634 | PCM/ECM/TCM Internal Temperature Too High Brand | Powertrain |
| EOBD | P0634 | Styrmodul intern temperatur 'A' för hög Brand | Powertrain |
| Fiat | P0634 | PCM/ECM/TCM Internal temperature too high Brand | Powertrain |
| Geely | P0634 | PCM/ECM/TCM Internal Temperature Too High Brand | Powertrain |
| GM | P0634 | PCM/ECM/TCM Internal Temperature Too High Brand | Powertrain |
| Great Wall | P0634 | PCM/ECM/TCM Internal Temperature Too High Brand | Powertrain |
| Hafei | P0634 | PCM/ECM/TCM Internal Temperature Too High Brand | Powertrain |
| Holden | P0634 | Control Module Internal Temperature A Too High SAE | Powertrain |
| Honda | P0634 | Control Module Internal Temperature A Too High SAE | Powertrain |
| Hyundai | P0634 | Control Module Internal Temperature A Too High SAE | Powertrain |
| Isuzu | P0634 | Control Module Internal Temperature A Too High SAE | Powertrain |
| Land Rover | P0634 | Transmission control module internal temperature too high Brand | Powertrain |
| Maserati | P0634 | Powertrain control module/Engine Control Module/TCM Internal Temperature Too High Brand | Powertrain |
| Opel | P0634 | PCM/ECM/TCM Internal Temperature Too High Brand | Powertrain |
| Peugeot | P0634 | Control Module Internal Temperature A Too High SAE | Powertrain |
| Porsche | P0634 | Control Module Internal Temperature A Too High SAE | Powertrain |
| Proton | P0634 | Control Module Internal Temperature A Too High SAE | Powertrain |
| Saab | P0634 | PCM/ECM/TCM Internal Temperature Too High Brand | Powertrain |
| MG (SAIC) | P0634 | Hot mode Error Brand | Powertrain |
| Tata | P0634 | PCM/ECM/TCM Internal Temperature Too High Brand | Powertrain |
| Toyota | P0634 | Controller printed circuit board (PCB) temperature is too high Brand | Powertrain |
| Volkswagen | P0634 | Control module overtemperature condition Brand | Powertrain |
Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.
5Extended variant codes 8
These 7-character codes are manufacturer-specific variants of P0634 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P063400 | overtemperature error Brand | Powertrain |
| Porsche | P063400 | No description available | Powertrain |
| Smart | P063400 | No description available | Powertrain |
| SsangYong | P063400 | ECU error: interior circuit overheating Brand | Powertrain |
| Mercedes-Benz | P063401 | balancing circuit temperature too high Brand | Powertrain |
| Mercedes-Benz | P063409 | Die Temperatur im Steuergerät ist zu hoch.Es liegt ein Bauteilfehler vor. Brand | Powertrain |
| Mercedes-Benz | P06344B | The temperature in the control unit is too high. There is a fault due to overtemperature. Brand | Powertrain |
| Mercedes-Benz | P063498 | Die Temperatur im Steuergerät ist zu hoch.Die Komponente oder das System hat Übertemperatur. Brand | Powertrain |
6Related codes
Browse Pxxx codes or P063xx codes.