MartinM

Hi guys i have 2014 chevy 1/2 ton truck and it wont switch out of 4 wheel drive, the indicator light on the 4X4 shifter **** only turns when i turn the **** to auto, nothing else happens no matter where i turn it to....
No shifting sounds or nothing, any idea what could be wrong ? or anyway i can manually shift it to see if its just stuck or something?
thanks

MartinM

hi i have a 2014 chevy Silverado 1500 LT with a 4.3l I'm having 4wd issues, there is a service 4wd message on the dash and i am constantly getting 3 codes from the TCCM C0306, C0321, C0396...
and i have already checked the obvious fuses, 10volts at the encoder motor, i replaced the 4WD switch and the encoder motor already, still have the same codes and cant hear any audible noises from the shift motor.
wondering if any of yall have have the same problem and what it would take to get it fixed.... other then what I've already done obviously lol..
thanks.

mountainmanjoe

Do you have the MP162x (RPO NQF) or MP302x (RPO NQH) transfer case?


here are all the diagnostic steps for C0306
https://charm.li/Chevy%20Truck/2013/...0Charts/C0306/

C0321
https://charm.li/Chevy%20Truck/2013/...0Charts/C0321/

C0396
https://charm.li/Chevy%20Truck/2013/...0Charts/C0396/

electrical schematics

https://charm.li/Chevy%20Truck/2013/...ansfer%20Case/

MartinM

i have a MP3024 automatic 2 speed transfer case.

MartinM

how do i know if i have a bad T case control module? are there any tests i can do to check that out without replacing the control module.

mountainmanjoe

By following the diagnostic steps in the links I posted. The tests are there.
The site also has symptom related procedures:
https://charm.li/Chevy%20Truck/2013/...ansfer%20Case/