Torque converter flash

Dr. ice · June 21, 2015

I don't have a copy of the bulletin, but my dealer performed a torque converter flash on my 2015 6.2 max tow this past Friday. My truck has had 2200 miles with no weird transmission characteristics. I am now experiencing a jerky transmission along with an occasional thud at speeds below 45. Any one else experience this? I am calling my dealer in the morning to see if the update can be removed.

CounterMeasure · June 21, 2015

I don't have a copy of the bulletin, but my dealer performed a torque converter flash on my 2015 6.2 max tow this past Friday. My truck has had 2200 miles with no weird transmission characteristics. I am now experiencing a jerky transmission along with an occasional thud at speeds below 45. Any one else experience this? I am calling my dealer in the morning to see if the update can be removed.

Read through http://www.gm-trucks.com/forums/topic/173185-62l-8-speed-owners-gm-update-15389. Short version, the flash resets your truck back to full learning mode, plus the slightly stiffer shifts that engage the TC. I've put about 1000 miles on mine since the update and the shifting is better than right after the update, but is still pretty bad.