4T60E Tcc Solenoid, new and ready to install. Fits the 4T60E. Ships fast from the USA.
Searching for a 4T60E TCC solenoid usually means a 1990s GM front-drive car, such as a Buick LeSabre or Regal, Pontiac Bonneville or Grand Prix, Oldsmobile 88, or Chevrolet Lumina, that has started shuddering on the highway, will not lock the converter once it is hot, or shifts erratically between second and third. This listing is more than one solenoid. It is a brand-new four-piece original-equipment replacement set for the 1991-1999 4T60-E: the 1-2 shift solenoid (A), the 2-3 shift solenoid (B), the on/off TCC solenoid and the PWM TCC solenoid. On a 25-year-old transaxle, coils of the same age tend to fail one after another, so replacing all four while the side cover is off saves a second teardown.
The 4T60-E was the first electronically shifted version of GM's 4T60, and its lockup control uses two solenoids working together. The on/off TCC solenoid opens the converter clutch circuit when the computer decides conditions are right, and the PWM solenoid then ramps apply pressure so the clutch engages smoothly instead of grabbing. If either one sticks or bleeds oil, the converter clutch either never applies or applies and slips, which overheats the converter and the fluid. Shift solenoids A and B are simple on/off valves; the computer combines their on and off states to pick first through fourth, so a failed coil shows up as missing gears or the wrong starting gear. GM carried this layout into the 4T65-E that followed in 1997, which is why our 4T65E diagnostic guides apply closely to this unit.
Read the codes, then measure each solenoid at the case connector and again directly at the solenoid; a big difference means the wiring, not the coil. Watch commanded gear against actual ratio on a scan tool for shift complaints. Keep in mind that Sonnax ties the same lockup symptoms to a worn TCC regulator valve on 1993-later 4T60-E units, and the second-gear-start and no-fourth complaints to a worn 2-3 shift valve on 1994-later units, so a bad bore can mimic a bad solenoid. Our shift solenoid symptoms guide lays out the testing sequence, and the 4T65E common problems guide explains how to separate hydraulic and electrical faults on this family.
The set is listed for GM vehicles with the 4T60-E built from 1991 through 1999. Note that GM began changing over to the 4T65-E in 1997, so a 1997-1999 car may have either transaxle; check the unit identification tag or send us your year and VIN before ordering. The 4T60-E also saw running changes in its valve body during production, so compare the four solenoids and their connectors in the photo to what is on your valve body. If you own an early unit we also list a 1991 4T60E TCC solenoid, and the full range of parts for both transaxles is in the 4T65E and 4T60E collection.
Disconnect the battery, drain the fluid and remove the side cover to reach the valve body. Unplug the internal harness, note where each solenoid sits, and swap them one at a time so A and B are not reversed. Fit each new solenoid with its O-ring lubricated in clean ATF and seat it fully before installing the retainer. Look the harness over for brittle or melted insulation. Refill with Dexron VI, which GM approved for back-service in transaxles originally filled with Dexron-III. Clear codes and drive through several warm lockup cycles to confirm. If shifts are still soft or harsh after new solenoids, the 1991-1999 4T60E shift kit corrects the hydraulic calibration, and worn second or third clutches call for the 4T60E clutch module.
| Fits | 4T60E |
| Part type | Tcc Solenoid |
| Condition | New |
| Brand | GM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Four new solenoids: the 1-2 shift solenoid (A), the 2-3 shift solenoid (B), the on/off TCC solenoid and the PWM TCC solenoid. It does not include a pressure switch or wiring harness.
It fits 1991-1999 cars that have the 4T60-E. Some 1997-1999 cars already had the newer 4T65-E, which uses different solenoids, so check the transaxle ID tag or send us your year and VIN.
A TCC or PWM solenoid that leaks once warm is a common cause. A worn TCC regulator valve bore produces the same complaint, so test the solenoids and wiring first, then inspect the valve body bores.
Use Dexron VI. GM designed it to be back-serviceable into transaxles originally filled with Dexron-III, which is what the 4T60-E used from the factory.
No. The solenoids are on the valve body behind the side cover, so they can be replaced with the transaxle in the car. Plan on draining the fluid and replacing the side cover gasket.
On a unit this old it is usually worth it, because the other coils have the same age and wear and the side cover only has to come off once.
