PowertrainP121D
CautionSeverity: Caution - get it checked when you can
NO. 542 battery voltage sampling wire loop fault
Key terms: Control module: a small computer that runs one part of the car · Powertrain: engine, transmission and emissions
1What it means in plain English
The engine or powertrain control system has stored a fault that does not have specific guidance in this database yet.
2Common causes
- Sensor or actuator fault
- Wiring or connector fault
- Vacuum or intake leak
- Fuel or ignition problem
- Control module fault
3Can I drive?
The electrical system may fail and the battery may go flat, risking a stall. If the battery or charging warning light is on, drive straight to a workshop.
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 13
| Brand | Code | Description | System |
|---|---|---|---|
| BYD | P121D | NO. 542 battery voltage sampling wire loop fault Brand | Powertrain |
| Chery | P121D | Firing Order Cylinder 4 Fuel Injector Wire Harness Short Circuit Brand | Powertrain |
| Daewoo | P121D | No description available | Powertrain |
| DFXK | P121D | Firing order cylinder 4 general short circuit Brand | Powertrain |
| EOBD | P121D | Suhu kopling tinggi 4 Brand | Powertrain |
| GM | P121D | No description available | Powertrain |
| Great Wall | P121D | Firing order cylinder 4 injector general fault, short circuit Brand | Powertrain |
| Holden | P121D | Fuel Heater Relay 2 Control Circuit Brand | Powertrain |
| Isuzu | P121D | No description available | Powertrain |
| Opel | P121D | No description available | Powertrain |
| Peugeot | P121D | No description available | Powertrain |
| Saab | P121D | No description available | Powertrain |
| Tata | P121D | No description available | 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.
5Related codes
Browse Pxxx codes or P121xx codes.