PowertrainP0644
SeriousSeverity: Serious - have it checked soon
Driver Display Serial Communication Circuit
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 24
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0644 | Driver Display Serial Communication Circuit SAE | Powertrain |
| BAIC Motor | P0644 | Driver Display Serial Communication Circuit Brand | Powertrain |
| Mercedes-Benz | P0644 | Driver Display Serial Communication Circuit SAE | Powertrain |
| BYD | P0644 | Driver Display Serial Communication Circuit Brand | Powertrain |
| Chery | P0644 | Driver Display Serial Communication Circuit Brand | Powertrain |
| Daewoo | P0644 | Driver Display Serial Communication Circuit Brand | Powertrain |
| DFFS | P0644 | Driver Display Serial Communication Circuit Brand | Powertrain |
| DFFX | P0644 | Driver Display Serial Communication Circuit Brand | Powertrain |
| DFXK | P0644 | Driver Display Serial Communication Circuit Brand | Powertrain |
| EOBD | P0644 | Juhi ekraani seerilise side ahel Brand | Powertrain |
| Geely | P0644 | Driver Display Serial Communication Circuit Brand | Powertrain |
| GM | P0644 | Driver Display Serial Communication Circuit Brand | Powertrain |
| Great Wall | P0644 | Driver Display Serial Communication Circuit Brand | Powertrain |
| Hafei | P0644 | Driver Display Serial Communication Circuit Brand | Powertrain |
| Hyundai | P0644 | Driver Display Serial Communication Circuit SAE | Powertrain |
| Isuzu | P0644 | Driver Display Serial Communication Circuit SAE | Powertrain |
| Land Rover | P0644 | Driver's display serial communication circuit Brand | Powertrain |
| Peugeot | P0644 | Driver Display Serial Communication Circuit SAE | Powertrain |
| Saab | P0644 | Driver Display Serial Communication Circuit Brand | Powertrain |
| MG (SAIC) | P0644 | Driver Display Serial Communication Circuit Brand | Powertrain |
| Sprinter | P0644 | Driver Display Serial Communication Circuit SAE | Powertrain |
| Tata | P0644 | Driver Display Serial Communication Circuit Brand | Powertrain |
| Toyota | P0644 | ECU internal fault (series left 2nd and 3rd row pretensioner ignition system) Brand | Powertrain |
| Volkswagen | P0644 | SAE: Driver Display Serial Communication Circuit 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 1
These 7-character codes are manufacturer-specific variants of P0644 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| SsangYong | P064400 | CAN: faulty instrument cluster Brand | Powertrain |
6Related codes
Browse Pxxx codes or P064xx codes.