PowertrainP0AA7
CautionSeverity: Caution - get it checked when you can
Cell voltage sensor 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?
Caution · drive with care
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 32
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0AA7 | Wheel Sensor Driven Axle Right.Wiring Shorted To Battery Voltage Brand | Powertrain |
| BAIC Motor | P0AA7 | Hybrid Battery Voltage Isolation Sensor Circuit Brand | Powertrain |
| Mercedes-Benz | P0AA7 | No description available | Powertrain |
| BYD | P0AA7 | Hybrid Battery Voltage Isolation Sensor Circuit Brand | Powertrain |
| Chery | P0AA7 | Hybrid Battery Voltage Isolation Sensor Circuit Brand | Powertrain |
| Daewoo | P0AA7 | Hybrid Battery Voltage Isolation Sensor Circuit Brand | Powertrain |
| Daihatsu | P0AA7 | Insulation error detector self-circuit circuit Brand | Powertrain |
| DFFS | P0AA7 | Cell voltage sensor fault Brand | Powertrain |
| DFFX | P0AA7 | Hybrid Battery Voltage Isolation Sensor Circuit Brand | Powertrain |
| DFXK | P0AA7 | Hybrid Battery Voltage Isolation Sensor Circuit Brand | Powertrain |
| EOBD | P0AA7 | Hybrid/EV-akun jänniteeristysanturin piiri Brand | Powertrain |
| Ford | P0AA7 | No description available | Powertrain |
| Geely | P0AA7 | Hybrid Battery Voltage Isolation Sensor Circuit Brand | Powertrain |
| GM | P0AA7 | Hybrid Battery Voltage Isolation Sensor Circuit Brand | Powertrain |
| Great Wall | P0AA7 | Hybrid Battery Voltage Isolation Sensor Circuit Brand | Powertrain |
| Hafei | P0AA7 | Hybrid Battery Voltage Isolation Sensor Circuit Brand | Powertrain |
| Holden | P0AA7 | Hybrid/EV Battery Voltage Isolation Sensing Circuit Brand | Powertrain |
| Honda | P0AA7 | No description available | Powertrain |
| Hyundai | P0AA7 | No description available | Powertrain |
| Isuzu | P0AA7 | No description available | Powertrain |
| Land Rover | P0AA7 | Hybrid battery voltage isolation sensor circuit Brand | Powertrain |
| Mazda | P0AA7 | No description available | Powertrain |
| Mitsubishi | P0AA7 | Leak SNSR. detection circuit Brand | Powertrain |
| Opel | P0AA7 | Hybrid/EV Battery Voltage Isolation Sensing Circuit Brand | Powertrain |
| Perodua | P0AA7 | Insulation error detector self-circuit circuit Brand | Powertrain |
| Peugeot | P0AA7 | No description available | Powertrain |
| Proton | P0AA7 | Leak SNSR. detection circuit Brand | Powertrain |
| Saab | P0AA7 | Hybrid Battery Voltage Isolation Sensor Circuit Brand | Powertrain |
| MG (SAIC) | P0AA7 | Hybrid Battery Voltage Isolation Sensor Circuit Brand | Powertrain |
| Subaru | P0AA7 | No description available | Powertrain |
| Suzuki | P0AA7 | Hybrid Battery Voltage Isolation Sensor Circuit Brand | Powertrain |
| Toyota | P0AA7 | Cell voltage sensor fault 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 22
These 7-character codes are manufacturer-specific variants of P0AA7 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P0AA700 | Hybrid Battery Voltage Isolation Sensor Circuit Brand | Powertrain |
| Mercedes-Benz | P0AA703 | IMD isolation measure path stuck Brand | Powertrain |
| Mercedes-Benz | P0AA704 | Hybrid/EV Battery Voltage Isolation Sensor Circuit Brand | Powertrain |
| Mercedes-Benz | P0AA706 | The ohmmeter for the isolation resistance in the hybrid/high-voltage battery module has an electrical fault. Algorithm Based Failure. Brand | Powertrain |
| Mercedes-Benz | P0AA707 | IMD isolation measure path stuck Brand | Powertrain |
| Mercedes-Benz | P0AA708 | The ohmmeter for the isolation resistance in the hybrid/high-voltage battery module has an electrical fault. Bus Signal / Message Failure. Brand | Powertrain |
| Mercedes-Benz | P0AA709 | The ohmmeter for the isolation resistance in the hybrid/high-voltage battery module has an electrical fault. Component Failure. Brand | Powertrain |
| Mercedes-Benz | P0AA716 | The ohmmeter for the isolation resistance in the hybrid/high-voltage battery module has an electrical fault. Circuit Voltage Below Threshold. Brand | Powertrain |
| Mercedes-Benz | P0AA717 | The ohmmeter for the isolation resistance in the hybrid/high-voltage battery module has an electrical fault. Circuit Voltage Above Threshold. Brand | Powertrain |
| Mercedes-Benz | P0AA71C | Hybrid Battery Voltage Isolation Sensor Circuit. circuit voltage out of range Brand | Powertrain |
| Mercedes-Benz | P0AA71E | The ohmmeter for isolation resistance in the high-voltage battery module has an electrical fault. Brand | Powertrain |
| Mercedes-Benz | P0AA742 | The ohmmeter for the isolation resistance in the hybrid/high-voltage battery module has an electrical fault. General Memory Failure. Brand | Powertrain |
| Mercedes-Benz | P0AA747 | Hybrid/EV Battery Voltage Isolation Sensor Circuit Brand | Powertrain |
| Mercedes-Benz | P0AA748 | Hybrid/EV Battery Voltage Isolation Sensor Circuit Brand | Powertrain |
| Mercedes-Benz | P0AA749 | The ohmmeter for the isolation resistance in the hybrid/high-voltage battery module has an electrical fault. Internal Electronic Failure. Brand | Powertrain |
| Mercedes-Benz | P0AA761 | The ohmmeter for the isolation resistance in the hybrid/high-voltage battery module has an electrical fault. Signal Calculation Failure. Brand | Powertrain |
| Mercedes-Benz | P0AA764 | The ohmmeter for the isolation resistance in the hybrid/high-voltage battery module has an electrical fault. Signal Plausibility Failure. Brand | Powertrain |
| Mercedes-Benz | P0AA784 | The ohmmeter for the isolation resistance in the hybrid/high-voltage battery module has an electrical fault. Signal Below Allowable Range. Brand | Powertrain |
| Mercedes-Benz | P0AA785 | The ohmmeter for the isolation resistance in the hybrid/high-voltage battery module has an electrical fault. Signal Above Allowable Range. Brand | Powertrain |
| Mercedes-Benz | P0AA7A3 | The ohmmeter for the isolation resistance in the hybrid/high-voltage battery module has an electrical fault. System Voltage High. Brand | Powertrain |
| Mercedes-Benz | P0AA7FA | Hybrid/EV Battery Voltage Isolation Sensor Circuit. FA Brand | Powertrain |
| Mercedes-Benz | P0AA7FB | Hybrid/EV Battery Voltage Isolation Sensor Circuit. FB Brand | Powertrain |
6Related codes
Browse Pxxx codes or P0AAxx codes.