Originally Posted by golunnova
I have a 08 LGT and have a harsh shift from 2nd to 3rd gear. Read about some members bringing it to the stealership for a TCU Reset and relearn. Any comments on the results?
There are 2 'options,' depending what is required from the dealer
1. There is a TSB on this harsh shift, and the update may or may not fix this problem. If it doesn't, dealer will require the car to be brought back for more inspection after putting a few miles on the car.
2. If (1) has been performed, the TCU will need to be set to 'learn' this will erase all programmed data.
I can say from experience, #1 did not work, and #2 worked. Well... #2 worked because there was a error code but no check engine light.