PowertrainP0AA4
CautionSeverity: Caution - get it checked when you can
Hybrid/EV Battery Negative Contactor Circuit Stuck Closed
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 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?
Have it diagnosed promptly. If the car runs and drives normally, drive gently to a workshop. If it runs badly, stalls, overheats, loses oil pressure, or a warning light is flashing or red, stop safely and get professional help. If the code concerns the brakes, brake vacuum or brake assist, do not drive until it is checked: a hard pedal or longer stopping distance means stop.
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 | P0AA4 | Hybrid/EV Battery Negative Contactor Circuit Stuck Closed SAE | Powertrain |
| BAIC Motor | P0AA4 | Hybrid Battery Negative Contactor Circuit Stuck Closed Brand | Powertrain |
| Mercedes-Benz | P0AA4 | Hybrid/EV Battery Negative Contactor Circuit Stuck Closed SAE | Powertrain |
| BYD | P0AA4 | Hybrid Battery Negative Contactor Circuit Stuck Closed Brand | Powertrain |
| Chery | P0AA4 | Battery voltage low Brand | Powertrain |
| Chrysler | P0AA4 | Negative contactor is welded Brand | Powertrain |
| Daewoo | P0AA4 | Hybrid Battery Negative Contactor Circuit Stuck Closed Brand | Powertrain |
| Daihatsu | P0AA4 | SMRG actuator stuck closed Brand | Powertrain |
| DFFS | P0AA4 | Hybrid Battery Negative Contactor Circuit Stuck Closed Brand | Powertrain |
| DFFX | P0AA4 | Hybrid Battery Negative Contactor Circuit Stuck Closed Brand | Powertrain |
| DFXK | P0AA4 | Hybrid Battery Negative Contactor Circuit Stuck Closed Brand | Powertrain |
| EOBD | P0AA4 | Hybrid/EV batteri negativ kontaktorkreds fastlåst lukket Brand | Powertrain |
| Ford | P0AA4 | Hybrid/EV Battery Negative Contactor Circuit Stuck Closed Brand | Powertrain |
| Geely | P0AA4 | Hybrid Battery Negative Contactor Circuit Stuck Closed Brand | Powertrain |
| GM | P0AA4 | Hybrid Battery Negative Contactor Circuit Stuck Closed Brand | Powertrain |
| Great Wall | P0AA4 | Hybrid Battery Negative Contactor Circuit Stuck Closed Brand | Powertrain |
| Hafei | P0AA4 | Hybrid Battery Negative Contactor Circuit Stuck Closed Brand | Powertrain |
| Holden | P0AA4 | Hybrid/EV Battery Negative Contactor Circuit Stuck Closed Brand | Powertrain |
| Honda | P0AA4 | Hybrid/EV Battery Negative Contactor Circuit Stuck Closed SAE | Powertrain |
| Hyundai | P0AA4 | Hybrid/EV Battery Negative Contactor Circuit Stuck Closed SAE | Powertrain |
| Isuzu | P0AA4 | Hybrid/EV Battery Negative Contactor Circuit Stuck Closed SAE | Powertrain |
| Land Rover | P0AA4 | Hybrid/EV Battery Negative Contactor Circuit Stuck Closed SAE | Powertrain |
| Mitsubishi | P0AA4 | Main contactor N weld Brand | Powertrain |
| Opel | P0AA4 | Hybrid Battery Negative Contactor Circuit Stuck Closed Brand | Powertrain |
| Perodua | P0AA4 | SMRG actuator stuck closed Brand | Powertrain |
| Peugeot | P0AA4 | Hybrid/EV Battery Negative Contactor Circuit Stuck Closed SAE | Powertrain |
| Proton | P0AA4 | Main contactor N weld Brand | Powertrain |
| Saab | P0AA4 | Hybrid Battery Negative Contactor Circuit Stuck Closed Brand | Powertrain |
| MG (SAIC) | P0AA4 | Hybrid Battery Negative Contactor Circuit Stuck Closed Brand | Powertrain |
| Subaru | P0AA4 | Hybrid/EV Battery Negative Contactor Circuit Stuck Closed SAE | Powertrain |
| Toyota | P0AA4 | Hybrid Battery Negative Contactor Circuit Stuck Closed 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 P0AA4 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Porsche | P0AA400 | Displaycode Brand | Powertrain |
| Mercedes-Benz | P0AA49F | The contact 'Negative terminal' of contactor A in the high-voltage battery is jammed closed. The switch is jammed closed. Brand | Powertrain |
6Related codes
Browse Pxxx codes or P0AAxx codes.