P0AFF: The hybrid battery voltage is too low for step down conversion
The hybrid battery voltage is too low for step down conversion. The voltage cannot be reduced properly.
| Code | P0AFF |
|---|---|
| System | Engine and transmission |
| Group | P0Axx, Hybrid and electric |
| Type | Generic: it means the same on every make |
How to read and clear P0AFF 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 P0AFF 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
- P0AFB The hybrid battery system voltage is above normal
- P0AFC The high voltage battery sensor module is not working properly
- P0AFD The high voltage battery temperature is below normal
- P0AFE The hybrid battery voltage is too low for step up conversion
- P0A0F Engine failed to start
- P0A1F Battery energy control module fault
- P0A7F Hybrid battery pack deterioration
- P0A80 Replace hybrid battery pack
What does code P0AFF mean?
The hybrid battery voltage is too low for step down conversion. The voltage cannot be reduced properly.
How do you clear P0AFF?
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, P0AFF 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.
