P0AA3: The negative hybrid battery contactor has an electrical fault
The negative hybrid battery contactor has an electrical fault. It may be the part itself, its connector or the wiring.
| Code | P0AA3 |
|---|---|
| System | Engine and transmission |
| Group | P0Axx, Hybrid and electric |
| Type | Generic: it means the same on every make |
How to read and clear P0AA3 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P0AA3 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P0A9F The hybrid battery temperature sensor A fails now and then
- P0AA0 The positive hybrid battery contactor has an electrical fault
- P0AA1 The hybrid battery positive contactor circuit has got stuck
- P0AA2 The hybrid battery positive contactor circuit has got stuck
- P0AA4 The hybrid battery negative contactor circuit has got stuck
- P0AA5 The hybrid battery negative contactor circuit has got stuck
- P0AA6 Hybrid high-voltage system isolation fault
- P0AA7 The hybrid battery voltage insulation sensor has an electrical fault
- P0A0F Engine failed to start
- P0A1F Battery energy control module fault
- P0A7F Hybrid battery pack deterioration
- P0A80 Replace hybrid battery pack
What does code P0AA3 mean?
The negative hybrid battery contactor has an electrical fault. It may be the part itself, its connector or the wiring.
How do you clear P0AA3?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P0AA3 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
