my gmc 3500 has been at the shop for 7 weeks. I changed trans spin on filter and drained pan. What? 7 quarts added back. pulled RV to oklahoma. 1 week later got in truck to head home. Put it in Drive, nothing. display told me to place in N to reset. I did but nothing. I added 1 quart of trans fluid and made the 806 mile trip to Mobile with no trouble. Back home I have had odd problems. Sticks in 1 gear. Shifts really hard, does not respond to shifting, and I can put truck in neutral. Crank and shift into gear and goes with no issues. Purchased used TCM. Took to the shop it is still sitting at. Shop had a Chevy mechanic come by and program replacement TCM. Now truck just shifts really hard. My problem, but I need my truck back. any experience with my issue? Thanks
Trans Issue 09 gmc 3500
- Thread starter timJ
- Start date
Really that doesnt help us much. We need codes from the tcm and ecm. Log of what its doing as well.
Not uncommon for hard shifts directly after swapping the TCM. Ask if they can use a scan tool to do a "relearn" on the TCM and see how it acts. If not setting any trouble codes or strange msg on the dash, relearn is likely all it requires.
It will fix itself in about 150 miles of city driving if you can’t relearn it.