EPC, TCC and both shift solenoids for the GM 4L80E in 1991-2003 Sierra and Silverado 2500/3500 trucks, OE 24216254, 24230288, 24210864, 24230289.
Searching for why your 1991-2003 Silverado or Sierra 2500 or 3500 is stuck in one gear, flaring between shifts, or turning high RPM on the highway because the converter will not lock? On a 4L80E those complaints usually start under the pan. This kit replaces all four valve body solenoids in one job: the EPC pressure control solenoid (OE 24216254), the 1-2/3-4 shift solenoid (24230288), the 2-3 shift solenoid (24230289) and the TCC converter clutch solenoid (24210864). It also suits the same transmission in Suburban, Express and Savana and other heavy GM trucks and vans of those years.
GM names the shift solenoids by the shift valve each one moves. The 1-2/3-4 solenoid strokes the valves for the first and third upshifts, and the 2-3 solenoid strokes the valve in the middle. Working as a pair, their on and off states give the computer four gears. The TCC solenoid opens a passage that applies the converter clutch at cruise. The EPC solenoid regulates line pressure continuously, firming it up under load and softening it at light throttle, which is why a failing one can make the truck either bang or slip.
You can test all four from outside the pan. GM's 4L80-E troubleshooting data published for HMMWV service gives these resistance values at the case connector: EPC solenoid 3.5 to 5.2 ohms between pins C and D, each shift solenoid 18 to 24 ohms (pins A and E for 1-2/3-4, pins B and E for 2-3), and TCC solenoid 10 to 14 ohms between pins S and E. Zero your meter leads first. An open or a reading well out of range means the solenoid or the internal harness has failed; wiggle the harness while measuring to tell which. In-range readings with a performance code point toward the valve body, so read our Silverado 2500 shift problems guide and the Sierra 2500 common problems guide before ordering parts.
Fits the GM 4L80E from 1991 through 2003. Later 2004-up units changed connectors and are covered by separate kits on our 4L80E collection page. Compare the numbers stamped on your old solenoids with the four OE numbers above before installing. A 1991-1993 unit that still has the original silver early-style EPC solenoid deserves a second look, because the early and later EPC designs are not interchangeable; if you see that, send us your year and VIN first.
Raise the truck level, drain the pan and remove it with the filter. Unplug each solenoid from the internal harness, remove its retainer, and swap in the new part with O-rings coated in ATF. Change them one at a time so every plug goes back where it came from. Check the harness pass-through at the case for seepage while you are there. Use a fresh pan gasket and filter such as the 4L80E oil pan kit with filter and gasket, refill with Dexron VI, clear the codes and drive it through all four gears and lockup before checking the level hot. If the shifts still feel soft or late after the solenoids go in, a 4L80E shift kit addresses the hydraulic side.
| Includes | EPC, TCC, 1-2/3-4 shift, 2-3 shift solenoids |
| Replaces | 24216254, 24230288, 24210864, 24230289 |
| Fits | GM 4L80E 1991-2003 |
| Weight | 1 lb |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Shift A is the 1-2/3-4 solenoid (OE 24230288) and shift B is the 2-3 solenoid (OE 24230289). Both are included.
No. This kit is for 1991-2003 4L80E units. 2004-and-later trucks use different connectors; check the 2004-up kits on our 4L80E page.
Measure at the case connector: about 3.5-5.2 ohms for the EPC, 18-24 ohms for each shift solenoid and 10-14 ohms for the TCC solenoid per GM troubleshooting data. Out-of-range or open readings mean the solenoid or harness is bad.
Many owners do, because the pan has to come off for any of them and the solenoids have the same age and heat history. If only a shift code is set and the truck is otherwise healthy, the shift pair alone is an option.
Refill with Dexron VI ATF and install a new filter and pan gasket at the same time.
