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P0A1F: Battery energy control module fault

The unit that monitors the high-voltage battery has detected an internal or power supply fault. The 12 V battery, a fuse or a connector is typical.

Code P0A1F at a glance
CodeP0A1F
SystemEngine and transmission
GroupP0Axx, Hybrid and electric
TypeGeneric: it means the same on every make
Can you keep driving?With care

What P0A1F means

The battery energy control module measures the high-voltage battery’s voltage, current and temperature and reports its condition to the rest of the hybrid system. This code means that module has a fault of its own, for example in its power supply, memory or measuring circuits. Without its data, the car limits or blocks use of the battery.

Most common causes

  • Low 12 V battery or loose terminals
  • Blown power fuse for the module
  • Loose or corroded module connector
  • Moisture or spilled liquid near the high-voltage battery, where the module usually sits
  • Faulty battery control module or one needing a software update

Symptoms

  • Engine warning light and hybrid system warning
  • Car will not go into READY mode or start
  • Limited power or no electric mode
  • Battery charge gauge showing nothing

Can you drive with P0A1F?

With care If the car starts you can drive with care, but it may lose hybrid mode or fail to restart. Get it to a hybrid specialist soon.

How to check it

Check the 12 V battery first: below about 12.2 V at rest, charge it and read the codes again. Also check for spills around the rear seats or boot, where the hybrid battery usually sits.

How to read and clear P0A1F 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 P0A1F with this same explanation and whether it’s confirmed, pending or permanent.

With Free you read this code with its short description for nothing, and clear it if the engine stores it over standard OBD. With Pro you get the full explanation, how the car was running when it was logged (revs, temperature, load) and clearing in every control unit.

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 the ITV. It’s all in how to read and clear fault codes and in the ITV and OBD.

Similar codes

P0A1F is a generic code, so it means the same on any make, for example on Abarth, Citroën, Hyundai, Mini, Seat, Volvo. See what Final OBD does on your car in makes and models.

What does code P0A1F mean?

The battery energy control module measures the high-voltage battery’s voltage, current and temperature and reports its condition to the rest of the hybrid system. This code means that module has a fault of its own, for example in its power supply, memory or measuring circuits. Without its data, the car limits or blocks use of the battery.

Can you drive with P0A1F?

If the car starts you can drive with care, but it may lose hybrid mode or fail to restart. Get it to a hybrid specialist soon.

How do you clear P0A1F?

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, P0A1F comes back.