Grand Prix TCC Stuck On Code P0742

Transmission Problem with my 1998 Pontiac Grand Prix GT. Check engine light codes for torque converter switch stuck on. Question: where is the torque converter switch? And can I fix this at home?

Answer:
OK. This is most likely the TCC solenoid is bad. Possibly the harness at the solenoid as well. Have also have a few problems in the valve body that the solenoid valve goes into. You would need to test the harness first, then check the resistance of the solenoid. If they check OK, the solenoid may be mechanicially stuck and not electrically failing.

This is not something that can really be done in your garage. You will need a lift and several special tools. The solenoids and valve body are located inside the side cover of the transmission. The cover is accessed through the drivers side wheel well.

The engine / transmission assembly needs to be supported with adjustable fixtures, the left side of the frame needs to be lowered after removing several items, while supporting the engine / transmission assembly. Then the engine / trans assembly would be lowered out of the bottom of the car far enough to get the cover off. Sometimes it is easier to remove the frame completely. Once the cover is off, the solenoids and harness can be removed. Expect to pay approx. 5 hr. labor at a repair shop.I will send a couple of pictures in a few minutes of the TCC valve location as viewed with the cover removed.

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2000 Pontiac Montana. Check engine P0742. No repairs made but fluid and filter change. Where is the torque converter clutch (TCC) located on vehicle? I need to replace it and don't want to take it to a shop and spend a lot of money.

Answer:
The torque converter clutch is part of the converter. The solenoid is located inside the side cover of the transmission. The whole subframe of the engine and transmission assembly needs to be lowered to get to the cover off off and replace the TCC solenoid. That is, if that is your problem. You should not just guess and replace parts. Proper diagnosis is needed. Especially with a big repair ob like this.


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