PowertrainP0633
SeriousSeverity: Serious - have it checked soon
Immobilizer Key Not Programmed - ECM/PCM
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 30
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0633 | Immobilizer Key Not Programmed - ECM/PCM SAE | Powertrain |
| BAIC Motor | P0633 | Immobilizer Fault Brand | Powertrain |
| Mercedes-Benz | P0633 | Immobilizer Key Not Programmed - ECM/PCM SAE | Powertrain |
| BYD | P0633 | Immobilizer Key Not Programmed ECM/PCM Brand | Powertrain |
| Chery | P0633 | Immobilizer Not Learn Fault Brand | Powertrain |
| Chrysler | P0633 | Important: DTC is present in the PCM. This means that the PCM does not contain a secret key Brand | Powertrain |
| Daewoo | P0633 | Security Code Not Programmed Brand | Powertrain |
| DFFS | P0633 | Immobilizer not learned Brand | Powertrain |
| DFFX | P0633 | anti-theft not written Brand | Powertrain |
| DFXK | P0633 | Immobilizer not learned Brand | Powertrain |
| EOBD | P0633 | Immobilizer key not programmed - ECM/PCM Brand | Powertrain |
| Geely | P0633 | Immobilizer key not learned - ECM Brand | Powertrain |
| GM | P0633 | Immobilizer Key Not Programmed ECM/PCM Brand | Powertrain |
| Great Wall | P0633 | IMMO not learning fault Brand | Powertrain |
| Hafei | P0633 | Immobilizer Key Not Programmed ECM/PCM Brand | Powertrain |
| Holden | P0633 | Immobilizer Key Not Programmed Brand | Powertrain |
| Hyundai | P0633 | Immobilizer Key Not Programmed - ECM/PCM SAE | Powertrain |
| Isuzu | P0633 | Immobilizer Key Not Programmed - ECM/PCM SAE | Powertrain |
| Land Rover | P0633 | Immobilizer Key Not Programmed - ECM/PCM SAE | Powertrain |
| Mahindra | P0633 | Immobilizer Key Not Programmed - ECM/PCM SAE | Powertrain |
| Maserati | P0633 | Sentry Key Immobilizer Module (SKIM) Secret Key Not Stored in PCM Brand | Powertrain |
| Opel | P0633 | Immobilizer Key Not Programmed ECM/PCM Brand | Powertrain |
| Peugeot | P0633 | Immobilizer Key Not Programmed - ECM/PCM SAE | Powertrain |
| Saab | P0633 | Immobilizer Key Not Programmed ECM/PCM Brand | Powertrain |
| MG (SAIC) | P0633 | Immobilizer Key Not Programmed ECM/PCM Brand | Powertrain |
| Sprinter | P0633 | Immobilizer Key Not Programmed - ECM/PCM SAE | Powertrain |
| SWM Motor | P0633 | immobilizer not learning fault Brand | Powertrain |
| Tata | P0633 | Immobilizer Key Not Programmed Brand | Powertrain |
| Toyota | P0633 | Immobilizer not learned Brand | Powertrain |
| Volkswagen | P0633 | SAE: Immobilizer Key Not Programmed 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 2
These 7-character codes are manufacturer-specific variants of P0633 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| SsangYong | P063300 | Immobilizer fault (refer to immobilizer section) Brand | Powertrain |
| Mercedes-Benz | P063344 | The control unit is not personalized. There is an error in the data memory. Brand | Powertrain |
6Related codes
Browse Pxxx codes or P063xx codes.