Keyless Operation System (KOS) or Keyless Entry key battery is low The "Review" of B1A10
The is a diagnostic trouble code (DTC) that indicates a low battery in the vehicle’s first registered keyless operation key (transmitter) . It is commonly associated with Mitsubishi models equipped with a Keyless Operation System (KOS) or Wireless Control Module (WCM), such as the Lancer and Outlander . Technical Definition mitsubishi b1a10
: As far as error codes go, this is one of the most "user-friendly." It doesn't signal a mechanical failure of the vehicle itself, but rather a maintenance item for your accessories. The "Fix" (Solution) Replace the Battery : Most Mitsubishi key fobs use a standard coin cell battery. Verify Other Keys : If you have multiple keys, check if codes (Key 2) or (Key 3) also appear. Clear the Code Keyless Operation System (KOS) or Keyless Entry key