The P0860 code in your 2022 Buick Regal indicates a communication error between the gear shift control module and other vehicle systems. This affects the electronic shifter's ability to communicate gear selection to the transmission.
Understanding Gear Shift Module Communication
The Regal uses an electronic gear selector that communicates over the vehicle's CAN bus network. P0860 indicates this communication has failed or become unreliable, affecting gear selection functions.
Common Causes of P0860
- Gear shift module internal failure
- CAN bus wiring problems
- TCM communication circuit issues
- Power or ground problems at shifter
- Connector corrosion
- Network interference or noise
Symptoms of Communication Error
- Gear shifter not responding
- Check engine light on
- Incorrect gear display
- Unable to shift from Park
- Multiple warning messages
- Vehicle may not start
Regal Electronic Controls
The Regal's electronic shifter relies entirely on network communication. Unlike mechanical shifters, there's no backup linkage if communication fails.