P0AC4: The hybrid powertrain control unit has requested the engine warning lamp to
The hybrid powertrain control unit has requested the engine warning lamp to turn on. The lamp signals a fault in that system.
| Code | P0AC4 |
|---|---|
| System | Engine and transmission |
| Group | P0Axx, Hybrid and electric |
| Type | Generic: it means the same on every make |
How to read and clear P0AC4 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 P0AC4 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
- P0AC0 The high voltage battery current sensor A gives readings outside the normal
- P0AC1 The high voltage battery current sensor A gives a lower signal than normal
- P0AC2 The high voltage battery current sensor A gives a higher signal than normal
- P0AC3 The high voltage battery current sensor A fails now and then
- P0AC5 The hybrid battery temperature sensor B has an electrical fault
- P0AC6 The hybrid battery temperature sensor B gives readings outside the normal range
- P0AC7 The hybrid battery temperature sensor B gives a lower signal than normal
- P0AC8 The hybrid battery temperature sensor B gives a higher signal than normal
- P0A0F Engine failed to start
- P0A1F Battery energy control module fault
- P0A7F Hybrid battery pack deterioration
- P0A80 Replace hybrid battery pack
What does code P0AC4 mean?
The hybrid powertrain control unit has requested the engine warning lamp to turn on. The lamp signals a fault in that system.
How do you clear P0AC4?
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, P0AC4 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.
