The Mitsubishi B1A was a prototype carrier-based attack bomber developed for the Imperial Japanese Navy in the mid-1930s. It was designed to replace the obsolete B2M. Only two prototypes were built (codenamed Mitsubishi 8-Shi ).

While usually straightforward, a few potential faults can trigger the B1A10 code.

After replacing the battery, the code may stay "stored" in the car's memory. Use an OBD-II scanner to erase the DTC and then test the lock/unlock functions to see if it returns. 3. Inspect the Transmitter

: The module flags the key battery as abnormal when the transmitter's internal power output drops to 2.3V or lower (from a standard 3.0V nominal level).

While a low key fob battery won't stall your engine while driving, it manifests in several frustrating ways:

While a dying coin-cell battery inside the remote control is the root cause roughly 95% of the time, the factory diagnostic framework accounts for three distinct failure points: Nature of the Failure Likelihood Natural discharge or low-voltage output (below 2.3V). Very High Key Fob Transmitter

If you want to to address this issue, you can search for authorized dealers near you. 42B-B1A10 Keyless/KOS key 1 low battery - Mitsubishi

The severity of DTC B1A10 is considered low. The vehicle can usually be driven without major safety concerns, but prolonged driving with the symptom should be avoided. If the key fob battery dies completely, it could leave you stranded.

The push-to-start button requiring multiple presses to register. How to Fix It (Step-by-Step) 1. Replace the Key Fob Battery

While a depleted coin-cell battery inside your key fob is the most frequent culprit, it is not the only cause. A diagnostic tool scanning a persistent B1A10 code points to three specific probabilities:

If you own a modern Mitsubishi—such as an Outlander, Eclipse Cross, or ASX—and have encountered a stubborn check engine light or a warning message on your dashboard, it might be the code.