4L80E Tcc Solenoid 1991-2003, remanufactured and ready to install. Fits the 4L80E. Ships fast from the USA.
If your 1991-2003 Chevrolet or GMC 2500 or 3500 pickup, Suburban 2500, Express or Savana van or Hummer H1 will not lock the converter, cruises at a higher RPM than it used to, or refuses fourth gear once the fluid gets hot, this remanufactured GM 4L80E set is built for that job. The listing is titled as a TCC solenoid, but the photo shows more than the lockup solenoid alone: the TCC solenoid, the pressure control (EPC) solenoid, both shift solenoids and the black plastic transmission range pressure switch assembly that bolts to the valve body. That last piece matters for a lockup complaint, as explained below.
The 4L80E has no throttle cable or governor, so the control module decides when the converter clutch applies. When conditions are right in third or fourth gear, the module energizes the TCC solenoid and oil is sent to apply the converter clutch, tying the engine to the input shaft. The brake switch on the pedal bracket gives the module a signal to drop lockup the moment you touch the brake. The module also needs to know what range the selector is in, and it learns that from the pressure switch assembly: five oil pressure switches feeding three range signals, A, B and C. In GM's 4L80-E troubleshooting data, an invalid range signal combination sets a range switch fault, and the module's default action includes no TCC and no fourth gear when hot. So a leaking or failed switch assembly can kill lockup on a truck whose TCC solenoid is perfectly good, which is why this set includes both.
Pull codes first, then check the circuit at the case connector with the harness unplugged. GM lists the TCC solenoid at 10 to 14 ohms between pins S and E. Pin E is the ignition feed shared with both shift solenoids, so if several solenoid codes appear at once, check that feed and fuse before condemning parts. Our 4L80E shift solenoid guide covers the pinout and the shift solenoid readings. If the electrical side passes and slip is still there, read the 4L80E common problems guide, because a worn converter clutch or worn valve body bores will keep slipping no matter which solenoid you fit.
The listing covers 1991-2003 4L80E applications, before the 2004 change to a revised internal harness and solenoid set. One detail early-truck owners should check: ATRA documents that the pressure control solenoid changed design between the 1991-93 and 1994-up units, from a silver body to a black one. The EPC in the photo is the dark-bodied type, so if you have a 1991-1993 unit, compare connectors and send us your year and VIN before ordering. For later trucks, match the solenoid connectors on your valve body to the photo. Every other 4L80E part is in our 4L80E parts collection, and a new-condition four-solenoid alternative without the switch assembly is the 4L80E solenoid set for 1996-2003.
Everything here is serviced with the pan dropped and the transmission in the truck. Drain the fluid, remove the filter, unplug the internal harness and unbolt each solenoid, noting its location. The switch assembly bolts to the valve body; keep its gasket surfaces clean and torque the bolts evenly so pressure does not leak past the switches. Install new O-rings on each solenoid and inspect the internal harness for brittle insulation and a loose case pass-through connector. If the truck has shift complaints alongside the lockup problem, a 4L80E shift kit can go in during the same pan drop, and a unit with heavy miles may be a better candidate for a remanufactured valve body. Refill with Dexron VI, which is back-serviceable for the Dexron III these units originally used, clear codes, and drive through several lockup cycles to confirm the converter holds.
| Fits | 4L80E 1991-2003 |
| Part type | Tcc Solenoid |
| Condition | Remanufactured |
| 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.
No. The photo shows the TCC solenoid, the EPC pressure control solenoid, both shift solenoids and the transmission range pressure switch assembly. If you only need one piece, contact us before ordering.
The module reads gear range from the five switches in that assembly. In GM's 4L80-E service data, a range switch fault defaults to no TCC and no fourth gear when hot, so a bad switch assembly can stop lockup even with a good TCC solenoid.
It is listed for 1991-2003, but the EPC solenoid changed design after 1993 and the one pictured is the later dark-bodied type. Send us your year and VIN and we will confirm before you order.
Unplug the case connector and measure between pins S and E. GM lists 10 to 14 ohms. Pin E is shared with the shift solenoids, so check that feed if several codes appear together.
Dexron VI ATF. It is back-serviceable for the Dexron III these 1991-2003 units shipped with. Fit a new filter and pan gasket during the job.
