I have had this happen several times-my TC light comes on, indicating that it is not working. And the car shifts very hard-like a race tranny. Previously, I attributed this to a loose fuse/relay, as it happened after hitting a pothole. I shut the engine off, pushed down on all of the fuses and relays, started up the car, and it was fine. But the last 2 times it happened, I did not hit any bumps. Then, I simply shut off the engine then restarted it and the light was off.

Anybody else have this problem? I am reluctant to bring the car back to the dealer because I fear they will reflash the computer which would erase my Tune.

 

The obvious first suspect would be the Tune itself. Did it ever happen before you got it?

It could be something else, but that's the first thing to eliminate.

Yves

 

Never happened before, and only started happening almost 1/2 year after the tune. So, while it is suspect I cant imagine why it would suddenly start to happen. I have to call Matt anyway and I will run it by him.

 

I spoke with Matt from Tune Time and he is certain that the tune had nothing to do with the problem. He has never heard of it happening before, and said I should check with Chevy to see if there is any TSB on it.

Meanwhile, it happened several times today-once after I did a burn out, and another time after driving in I gear for a few minutes. Each time, if I shut down the engine for a minute, it repaired itself. But if I did not leave the engine off long enough, the TC light was still on. All very strange.

So again, I ask if ANYBODY has had their TC light come on while driving

 

We haven't had an issue with it and we had Matt tune ours too, I hope you figure this out before it becomes a serious issue!

 

I spoke to my Chevy dealer and he said I could bring it in for them to check for codes but he suggested I check that all connections are secure from when the repair shop changed my rear axel. I did and they all seemed ok, but one of the support rivits was not pressed in and the wire was hanging loose. I put it in place, and so far have not had any codes. I tried to get the codes checked at my friends shop, but they are only up to 2005 with the code reader. So next week I will bring it by the dealer just to see what codes, if any, are present.