Credov

P2502 fault code: what it means

P2502: Generator (alternator) output voltage fault. Battery and i-stop will suffer; check connections before the alternator.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

  1. poor battery or alternator connection
  2. alternator
  3. battery
  4. STARTER 250 A fuse or main charge wire

P2502 by make

Mazda

Generator (alternator) output voltage fault. Battery and i-stop will suffer; check connections before the alternator.

Usual causes: poor battery or alternator connection; alternator; battery; STARTER 250 A fuse or main charge wire

Not sure what P2502 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.