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P1A51 fault code: what it means

P1A51: Outlander PHEV battery management unit (BMU) EEPROM abnormal. Can remain after a flat 12 V battery; may need BMU reset or replacement.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

  1. 12 V battery failure or voltage dip
  2. BMU internal memory fault

P1A51 by make

Mitsubishi

Outlander PHEV battery management unit (BMU) EEPROM abnormal. Can remain after a flat 12 V battery; may need BMU reset or replacement.

Usual causes: 12 V battery failure or voltage dip; BMU internal memory fault

Not sure what P1A51 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.