Thread: TCC lock up solenoid bad. 98 gp gt

Originally Posted by NegativeOne13

I use a Snap On Solus scan tool that allows two way communication as T0pwater said. I'm guessing component wear would be the reason. I had a remaned w/ 5k on it and I had that issue happen. Tried clearing tranny adapt settings and so on, nothing worked, but we did get it to lock in via the scan tool. Needless to say, my tranny was replaced under warranty.

This same thing is happening to my rebuilt trans. It's got less than 2K on it and I got a TCC circuit stuck on code one morning. Because they couldn't replicate it again when I took it in, they wouldn't fix the problem. I'm just hoping it comes back while the rebuild is still under warranty. It did it on a cold morning, so I may have to wait until the fall.

Do you remember which component they replaced to fix the issue on yours? Or did they do a whole new trans?

L36Pro, I did the same thing as you, replaced EVERYTHING hoping it was an electrical problem causing my bad trans symptoms. Ended up being the trans.

The EPC and TCC solenoids go out all the time in these trans's. It's been shown that the temps are very high in our transmissions, which degrades the fluid at a faster than normal rate, so if you follow the manufacturer's intervals for changing the fluid, it's sometimes not often enough. To prevent the problem once you replace the faulty components, you can add in an external trans. fluid cooler, which will keep the temps down where they should be. The stock cooler is inside the radiator tank closest to the battery, which saved GM money, but doesn't cool enough.

However, if it was me, I'd just throw out the trans and get a TEP built one. If you're gonna have someone else rebuild it, the costs are almost the same.

Originally Posted by NegativeOne13

I have no idea what the problem was man. We went out and recorded the TCC slippage and duty cycle, and called them and told them and they came and picked up the car. They usually just send a whole new transmission and they replace it at my friends shop. But, for some reason they wanted my car at their regional shop. When I got it back, I seen a new transmission. I'm guessing they wanted it there to see if it was a simple fix, if not just replace. Certified transmission is where I got mine from, 50k/36 month warranty for $1200... can't complain.

Could you tell me about what you recorded? I want to do the same so they can't BS me and tell me there's no problem. Let me know what parameter you read and what values indicate slippage or stuck-on condition, if you remember... Thanks

To OP... I doubt the problem is with the torque converter itself. More likely the TCC solenoid which controls the torque converter lockup clutch.

To others... give him a break, why complain about a 3-page thread that says nothing and make it a 4-page thread that says less?