The code indicates that the transmission control module detected movement of shift fork D when it was not commanded to shift, often due to a sensor or actuator fault.
The sensor that reports fork position to the PCM can fail, sending false movement signals.
Physical obstruction or wear in the fork can cause it to move unintentionally.
Damaged wiring or poor connections can create spurious signals interpreted as movement.
A rare software or internal fault in the transmission control module may misread the sensor.
Usually not; the issue is most often a faulty sensor, mechanical binding, or wiring problem.
It is generally unsafe because the transmission may shift unexpectedly; have it inspected promptly.
No, it is a transmission control issue and does not affect exhaust emissions directly.
Repair time varies with the cause, ranging from a few minutes for a sensor replacement to several hours for mechanical fork repair.