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?

Did you have any other codes along with the P0742?

VISITOR:No other codes.

OK. This is most likely the solenoid 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.

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 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.

2000 Pontiac Montana. Check engine P0742. No repairs made but fluid and filter change. Where is
the torque converter clutch located on vehicle?

The torque converter clutch is part of the converter. The solenoid is located inside the side cover of
the transmission. The whole frame and engine and transmission assembly needs to be lowered to
get to the solenoid. That is, if that is your problem. You should not just guess and replace parts.
Proper diagnosis is needed.

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Grand Prix TCC Stuck On Code P0742