4L80E Solenoid Kit 1994-2003, new and ready to install. Fits the 4L80E. Ships fast from the USA.
This kit is for the long middle run of the 4L80E, the 1994 through 2003 trucks: Chevy and GMC 2500 and 3500 pickups, Suburban 2500s and the Express and Savana heavy vans of those years. If yours is stuck in one gear, bangs into every shift, will not lock the converter, or keeps setting solenoid codes, this kit replaces the electrical parts under the pan as a set. As pictured, it contains the internal wiring harness with its case connector, the A and B shift solenoids, the TCC solenoid, the EPC pressure control solenoid and the pressure switch manifold.
A 4L80E shifts entirely on commands from the computer. Shift solenoids A and B open and close in combinations to stroke the shift valves and select gears one through four. The EPC solenoid is a variable force motor: the computer sends it a changing current to raise or lower line pressure, which sets how hard the clutches and bands apply. The TCC solenoid applies the torque converter clutch for lockup. The pressure switch manifold bolts to the valve body and reports back which range the manual valve is in, so the computer knows whether you have selected Drive, Manual 3, 2, 1 or Reverse. The harness ties all of it to the pass-through connector in the case.
One detail matters on these years. 1994 and 1995 trucks are pre-OBD-II and report two-digit codes; in GM's 4L80E troubleshooting data, code 73 is the pressure control solenoid circuit. Trucks from 1996 on report P-codes such as P0748 (EPC circuit), P0753 (shift solenoid A circuit) and P0758 (shift solenoid B circuit).
Write down every code and whether it is a circuit fault or a performance fault. Circuit faults point at the solenoid, the harness or the connector, and you can sort out which with an ohmmeter through the case connector and again at the part once the pan is down. If the codes point to pressure, a line pressure test with a gauge tells you whether the EPC is really in control. Our EPC solenoid symptoms guide has that test. If the truck is a 2500 Sierra, the Sierra 2500 problems guide separates the electrical faults from the worn-clutch faults. Keep in mind that worn bushings and a worn valve body can drop solenoid feed pressure and produce codes with perfectly good solenoids.
Listed for the GM 4L80E from 1994 to 2003. The EPC solenoid changed during the early production years: ATRA documents a switch from the silver solenoid used in 1991-1993 to a black solenoid in 1994-1995, with a larger spool valve and an added spring, and warns against mixing the styles. Later years revised the parts again, and 2004-up units use a different harness. Before you order, compare the EPC solenoid, the harness plugs and the pressure switch manifold in the photo with the parts in your pan, or send us the year and VIN and we will confirm the match. Every part we carry for this unit is on the 4L80E collection page.
Drain the fluid and drop the pan, then remove the filter and its case seal. Disconnect the harness at the pass-through connector and each component, remove the solenoids and unbolt the pressure switch manifold from the valve body. Torque the manifold bolts evenly when you install the new one, because an unevenly tightened manifold can leak and give false range readings. Lube every new solenoid O-ring with ATF, route the harness exactly as the original ran, and clip it down clear of the filter. Fit a new filter and gasket, then refill with Dexron VI, which is approved as a replacement for the Dexron III these trucks shipped with. Clear codes and road test through all ranges.
This kit does not include a filter, so add the 4L80E pan kit with filter and gasket to the order. If only the EPC is in question, the standalone 4L80E pressure control solenoid is the lower-cost route.
| Fits | 4L80E 1994-2003 |
| Part type | Solenoid Kit |
| 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.
As shown in the photo: the internal harness with case connector, shift solenoids A and B, the TCC solenoid, the EPC pressure control solenoid and the pressure switch manifold. A filter and pan gasket are not shown, so plan to buy those separately.
It is listed for 1994-2003 4L80E units, which includes 1995. Because the EPC solenoid style changed in the early years, compare your old EPC and harness plugs with the photo, or send us the VIN and we will confirm.
Code 73 on these early trucks is the pressure control solenoid circuit, and the EPC in this kit addresses it. Check the harness and connector too, since a broken wire sets the same code.
It tells the computer which gear range you selected. When its switches stick or its seal leaks, the computer can make the wrong shift decisions even with good solenoids. Replacing it with the rest of the parts covers that fault on the same pan drop.
Dexron VI. It is back-serviceable for Dexron III applications, which covers every year this kit fits. Set the level hot with the engine running.
