Mitsubishi | B1a10

Storing the key fob too close to the vehicle (within 25 feet) for extended periods can drain the battery as it constantly communicates with the KOS.

While a dying battery is the most common culprit, several factors can trigger this fault:

Turn the ignition ON, then lock and unlock the doors using the fob. If the code returns immediately despite a new battery, the fob itself may be faulty. mitsubishi b1a10

If the problem persists after a battery change and code reset, you may need to visit a dealership to register a new key ID or inspect the vehicle's wireless control module. 42B-B1A10 Keyless/KOS key 1 low battery - Mitsubishi

The internal coin-cell battery (usually a CR2032) has dropped to 2.3V or lower. Storing the key fob too close to the

The ECU "judges" the battery as abnormal if it receives a low voltage signal from the transmitter . If you have a second key fob experiencing the same issue, you would likely see code B1A11 . Primary Causes of B1A10

This solves the issue in the vast majority of cases. Use a high-quality replacement battery and ensure the contacts are clean. If the problem persists after a battery change

Use an OBDII scanner to erase the code from the vehicle's memory.