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OBD-II · Engine and powertrain (P)

P0A1F

Battery energy control module performance

What it means

The control unit that monitors the high-voltage battery has reported an internal fault or implausible readings.

Symptoms

  • Hybrid/EV warning light
  • Reduced power or car will not go into READY

Likely causes, most likely first

Likely causes, most likely first
No.Cause
01weak or low 12V battery
02internal fault in the battery control module
03voltage-sensing wiring fault inside the battery pack
04corroded battery pack connections

What to check, step by step

  1. 01Test and charge the 12V battery
  2. 02Read any sub-codes and battery block voltages
  3. 03Check for a software update for the battery control module
  4. 04Have a high-voltage qualified technician check the module and sensing wiring in the pack