The most common causes of B1A1F include: CAN bus communication timeout; Control module offline or not responding; Wiring harness damage or short circuit; Software version mismatch between modules. A professional OBD-II scan tool is recommended for accurate diagnosis.

How do I fix B1A1F for Chevrolet / GM Lyriq?

Recommended steps to address B1A1F: (1) Schedule service as soon as possible (2) Reduce driving speed and avoid long trips (3) Monitor for additional warning messages (4) Have the vehicle diagnosed by a certified technician. Always consult a qualified EV technician for high-voltage system repairs.

Is it safe to drive with B1A1F?

Driving with B1A1F is not recommended for extended distances. Schedule service within a few days to prevent further damage. Monitor for any additional warning lights.

Chevrolet / GM Lyriq

B1A1F

Warning

Wireless Communication Module Short Circuit to Ground

Severity

Warning

What does B1A1F mean?

Fault code B1A1F means "Wireless Communication Module Short Circuit to Ground". This is a General Motors-specific EV diagnostic trouble code for the GM Ultium / BEV3 platform. It is classified as "network" with a severity level of "warning". Applicable models: Chevrolet Equinox EV (2024+), Chevrolet Blazer EV (2024+), Honda Prologue (2024+), Cadillac Lyriq (2023+), Chevrolet Silverado EV (2024+).

Possible Causes

CAN bus communication timeout
Control module offline or not responding
Wiring harness damage or short circuit
Software version mismatch between modules

Recommended Actions

1 Schedule service as soon as possible
2 Reduce driving speed and avoid long trips
3 Monitor for additional warning messages
4 Have the vehicle diagnosed by a certified technician

This code applies to all vehicles. View generic B1A1F information →