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

Rarely, the KOS-ECU , ETACS-ECU, or WCM may be failing and misinterpreting signals. How to Fix and Clear the Code

The internal coin-cell battery (usually a CR2032) has dropped to 2.3V or lower. mitsubishi b1a10

Internal damage to the key fob's circuitry.

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. Use an OBDII scanner to erase the code

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 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 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.