PowertrainP0AA9
CautionSeverity: Caution - get it checked when you can
Hybrid/EV Battery Voltage Isolation Sensor Circuit Low
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?
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 26
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0AA9 | Seat Control Module.'F'. - Incorrect Or Unreliable Data Brand | Powertrain |
| BAIC Motor | P0AA9 | Hybrid Battery Voltage Isolation Sensor Circuit Low Brand | Powertrain |
| BYD | P0AA9 | Hybrid Battery Voltage Isolation Sensor Circuit Low Brand | Powertrain |
| Chery | P0AA9 | Power battery cell severe undervoltage alarm Brand | Powertrain |
| Daewoo | P0AA9 | Hybrid Battery Voltage Isolation Sensor Circuit Low Brand | Powertrain |
| DFFS | P0AA9 | Hybrid Battery Voltage Isolation Sensor Circuit Low Brand | Powertrain |
| DFFX | P0AA9 | Hybrid Battery Voltage Isolation Sensor Circuit Low Brand | Powertrain |
| DFXK | P0AA9 | Hybrid Battery Voltage Isolation Sensor Circuit Low Brand | Powertrain |
| EOBD | P0AA9 | Hybrid/EV-batterispenning isolasjonssensorkrets lav Brand | Powertrain |
| Geely | P0AA9 | Hybrid Battery Voltage Isolation Sensor Circuit Low Brand | Powertrain |
| GM | P0AA9 | Hybrid Battery Voltage Isolation Sensor Circuit Low Brand | Powertrain |
| Great Wall | P0AA9 | Hybrid Battery Voltage Isolation Sensor Circuit Low Brand | Powertrain |
| Hafei | P0AA9 | Hybrid Battery Voltage Isolation Sensor Circuit Low Brand | Powertrain |
| Holden | P0AA9 | Hybrid/EV Battery Voltage Isolation Sensing Circuit 1 Low Voltage Brand | Powertrain |
| Honda | P0AA9 | HV Battery Voltage Isolation Sensor Circuit Low Brand | Powertrain |
| Hyundai | P0AA9 | Hybrid/EV Battery Voltage Isolation Sensor Circuit Low SAE | Powertrain |
| Isuzu | P0AA9 | Hybrid/EV Battery Voltage Isolation Sensor Circuit Low SAE | Powertrain |
| Land Rover | P0AA9 | Hybrid battery voltage isolation sensor - circuit low Brand | Powertrain |
| Mitsubishi | P0AA9 | Leak SNS. detection circuit short Brand | Powertrain |
| Opel | P0AA9 | Hybrid/EV Battery Voltage Isolation Sensing Circuit 1 Low Voltage Brand | Powertrain |
| Peugeot | P0AA9 | Hybrid/EV Battery Voltage Isolation Sensing Circuit 1 Low Voltage Brand | Powertrain |
| Proton | P0AA9 | Leak SNS. detection circuit short Brand | Powertrain |
| Saab | P0AA9 | Hybrid Battery Voltage Isolation Sensor Circuit Low Brand | Powertrain |
| MG (SAIC) | P0AA9 | Hybrid Battery Voltage Isolation Sensor Circuit Low Brand | Powertrain |
| Subaru | P0AA9 | Hybrid/EV Battery Voltage Isolation Sensor Circuit Low SAE | Powertrain |
| Toyota | P0AA9 | Hybrid Battery Voltage Isolation Sensor Circuit Low 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.
5Related codes
Browse Pxxx codes or P0AAxx codes.