Internal damage to the key fob's circuitry.
Ensure your keys are stored far enough away from the car when parked to prevent "parasitic" drain.
While a dying battery is the most common culprit, several factors can trigger this fault: 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
Rarely, the KOS-ECU , ETACS-ECU, or WCM may be failing and misinterpreting signals. How to Fix and Clear the Code Internal damage to the key fob's circuitry
This solves the issue in the vast majority of cases. Use a high-quality replacement battery and ensure the contacts are clean.
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 42B-B1A10 Keyless/KOS key 1 low battery - Mitsubishi
Use an OBDII scanner to erase the code from the vehicle's memory.
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.
The diagnostic trouble code (DTC) in Mitsubishi vehicles specifically points to a low battery condition in Keyless Operation Key 1 . This code is generated by the Keyless Operation System (KOS) or the Wireless Control Module (WCM) when the vehicle detects a weak signal from the primary key fob. What Does DTC B1A10 Mean?