Credov

B1A25 fault code: what it means

B1A25: Invalid key seen by the wireless control module (Compass/Patriot MK). Engine may crank but not start, or not crank. FCA WCM software update.

Body · Costly if missed

Usual causes, most likely first

  1. key not programmed to vehicle
  2. key transponder fault
  3. WCM software
  4. WCM/antenna fault

B1A25 by make

Jeep

Invalid key seen by the wireless control module (Compass/Patriot MK). Engine may crank but not start, or not crank. FCA WCM software update.

Usual causes: key not programmed to vehicle; key transponder fault; WCM software; WCM/antenna fault

Not sure what B1A25 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.