Code : C0387
Make : GMC
Description : C0387 GMC Unable To Perform Shift
Possible causes :
– Faulty Transfer Case Motor/Encoder
– Transfer Case Motor/Encoder harness is open or shorted
– Transfer Case Motor/Encoder circuit poor electrical connection
Solutions :
– Carry out a Reset via CarDiag
– Choose a better quality fuel
– Check that the tank cap is securely closed
– Check the oil level and add more if it is lower than MAX
– Restart an Automatic diagnostic via CarDiag
– If the fault persists, you can check the “Possible causes” listed above : visually inspect (by yourself (tutorials to come) or by a professional) the wiring harness and the associated connectors, check for damaged components, and look for broken, bent, pushed, or corroded connector pins.
