Transmission Problems? Ask a Mechanic for Answers ASAP
I am sorry your having this problem
does the check engine light ever come on ?
do you know if there are any codes in the computer at all ?
does this truck have any aftermarket programmers or add ons ?
when was the last transmission fluid flash and filter changed on this transmission ?
No engine check light
Don't know about codes
As built configuration, and never had any programmer
Trans fluid not changed since built in 2003 (45,000 miles!)
This truck model known for electrical connection issues, and once when 400 miles only, the connector between the computer and tranny malfunctioned. Had to have Chevy pick it up on a flatbed and repair.
does the gear indicator ever flash in the dash or shut off ?
we have had bad park neutral switches cause this problem and even just some sediment rolling out in the fluid in the valve body cause this type of issue and a few with updating the programming in the ECM and TCM would correct this issue
with no light on and it never has an issue of it loosing a gear or acting like neutral the common ignition switch and TCM failures or wiring from the TCM to the transmission should not be your issue