Your car's torque converter clutch solenoid (TCC solenoid) controls the fluid to the servo. Your TCC solenoid might need replacing if your car always stalls when you slow down or when the speed goes below 25 or 30. You can have the TCC solenoid easily repaired at your car's dealer or a shop, but if you're relatively experienced in doing car repairs, this one is something you can do yourself. You don't have to even open the transmission and tinker with the valve body; with some care and patience, you can do this successfully. To replace your torque converter clutch solenoid, you will need a GM J 28467-A Engine Support Fixture, which you can rent at a local tool store. If you can't find one, you can improvise with chain attached to the engine support and a fence post attached to the strut towers.
- You will need a socket set, torque wrenches, combination wrenches, screwdrivers, drain pan, jack stands, jack, tube of silicone sealer, a new TCC, an engine support fixture, and transmission fluid.
- Using an engine degreaser, thoroughly clean the engine and the transmission. It's easier to work on a clean transmission, and it will keep dirt and grease from entering the transmission when you disassemble and reassemble the TCC solenoid.
- Disassemble the TCC solenoid by slowly removing its components. Begin with detaching all cables, then install the engine support fixture. Make sure you raise the engine high enough to remove pressure from the engine mounts. Remove the suspension supports, the transaxle supports, expansion bolts, and mount assemblies.
- Disassemble the valve body.
- Remove the valve body cover.
- Remove the leads from the pressure switch and the wiring harness from the case electrical connector.
- Remove the torque converter clutch bolt.
- Remove the 3rd pressure clutch switch.
- Remove the second clutch switch.
- Reassemble the torque converter clutch solenoid.
- Reinstall the second switch.
- Reinstall the 3rd clutch pressure switch.
- Reinstall the TCC bolt to the auxiliary valve body.
- Reinstall the wire harness to the case.
- Reinstall the valve body cover.
- Reassemble the valve body cover.
- Reinstall the gasket and valve body cover.
- Tighten the bolts to 14NM.
- Reinstall the transaxle mount bracket.
- Reassemble the transaxle mount bracket by putting everything else together.
- Inspect the oil level, the P/S oil level, TV cable, and suspension alignment for any oil leaks.
Make safety your number one priority when working with machinery. Wear the appropriate safety gear and watch out for hazardous materials, sharp objects, and hot instruments.
Don't use substitutes unless you're sure it won't compromise the safety and performance of your car.
Use jack stands to support the car you're working on. Never work on a car that's support by just a jack.
Always work on a level, solid surface. Never jack your car up on grass or on dirt.