P0A78: The traction motor inverter A gives readings outside the normal range
The traction motor inverter A gives readings outside the normal range. It is usually the part, its wiring or a connector with poor contact.
| Code | P0A78 |
|---|---|
| System | Engine and transmission |
| Group | P0Axx, Hybrid and electric |
| Type | Generic: it means the same on every make |
How to read and clear P0A78 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 P0A78 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
- P0A74 The generator phase V current is above normal
- P0A75 There is a fault in the generator phase W current
- P0A76 The generator phase W current is below normal
- P0A77 The generator phase W current is above normal
- P0A79 The traction motor inverter B gives readings outside the normal range
- P0A7A The generator inverter gives readings outside the normal range
- P0A7B The battery energy control unit has requested the engine warning lamp to turn on
- P0A7C The engine electronics is getting too hot
- P0A0F Engine failed to start
- P0A1F Battery energy control module fault
- P0A7F Hybrid battery pack deterioration
- P0A80 Replace hybrid battery pack
What does code P0A78 mean?
The traction motor inverter A gives readings outside the normal range. It is usually the part, its wiring or a connector with poor contact.
How do you clear P0A78?
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, P0A78 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.
