C0387 Code: Meaning, Causes, and Symptoms | OBD2 Codes
C0387 – Unable To Perform Shift
C0387 Possible Symptoms
Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)
C0387 Possible Causes
Faulty Transfer Case Motor/Encoder,Transfer Case Motor/Encoder harness is open or shorted,Transfer Case Motor/Encoder circuit poor electrical connection
Transfer case encoder is a switch that converts shaft position into electrical signals for use by the control module. The control module supplies an 8-volt reference and a ground circuit for the encoder Hall-Effect sensors to function. The control module supplies current limited to 5 volts on all the channels, and as the channels are pulled to ground, the module can interpret the location of the transfer case shift position. DTC C0387 sets when the transfer case is unable to successfully complete a shift to requested mode or range.