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B1A24 fault code: what it means

B1A24: Key ID not registered. Engine will not start with that key.

Body · Costly if missed

Usual causes, most likely first

  1. key not registered
  2. ignition key fault
  3. WCM fault

B1A24 by make

Mitsubishi

Key ID not registered. Engine will not start with that key.

Usual causes: key not registered; ignition key fault; WCM fault

Not sure what B1A24 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.