4L80E Pressure Control Solenoid 1994-2003, new and ready to install. Fits the 4L80E. Ships fast from the USA.
If your 1994-2003 Chevrolet or GMC heavy-duty truck, Suburban 2500 or full-size van with the 4L80E has started shifting like it was rear-ended, or has the opposite problem of lazy, slipping upshifts, the electronic pressure control solenoid is the part to test first. This listing is a new GM-brand solenoid for that year span, the black-body design that went into production in 1994 and stayed through the GMT400 and early GMT800 trucks.
Think of it as the throttle cable the 4L80E does not have. The control module reads throttle position, engine speed and other inputs, decides how much clamping force the clutches need, and expresses that as a current to this solenoid. The solenoid then bleeds torque signal oil, and the signal positions the pressure regulator valve. More current gives less pressure. In GM service data, close to zero amps produces about 157-177 psi in Park at idle, and roughly 1 amp brings it down to 35-55 psi. The solenoid is fed from the actuator feed limit (AFL) valve, which Sonnax says regulates line pressure down to a lower supply, typically in the 80-115 psi range, for the solenoids that control pressure and shifts.
A pressure gauge rated for at least 325 psi is the only way to be sure, because Reverse at full throttle can reach 324 psi. Run the scan tool EPC override in Park and step the current up in tenths of an amp. Pressure that never drops means the solenoid, its wiring or the module. Pressure that is low everywhere, even at zero amps, means a pump or hydraulic leak and a new solenoid will not help. Our 4L80E low line pressure guide covers that side. The repeat-failure case deserves its own warning. Sonnax points out that the EPC solenoid constantly oscillates torque signal and AFL oil, and that motion wears the AFL valve bore. Once it leaks, solenoid feed drops, line pressure sags and the new solenoid gets the blame. On a high-mileage unit, vacuum test the AFL bore during the repair. The wider list of what goes wrong is in 4L80E common problems and fixes.
This solenoid is listed for 4L80E transmissions from 1994 through 2003. GM changed the pressure control solenoid for 1994 from a silver Bosch unit to the black Holley design pictured here, and the oil passages in the valve body changed with it, so 1991-1993 transmissions with an original valve body are a separate fitment. ATRA warns that installing the older silver part in a later unit causes high line pressure. Match the body color, the connector and the length of the spool end against the part you remove, and if you have any doubt send us your year and VIN. Other years and kits are listed on the 4L80E collection page.
With the pan and filter off, the solenoid is visible on the valve body. Disconnect it, remove the retaining bracket and pull it straight out. Inspect the solenoid's inlet screens on the old unit; debris there tells you the fluid and filter need more attention than a quick change. Install the new part with fresh O-rings lubricated in ATF. If the shift solenoids are original too, the 4L80E master solenoid kit with harness and filter or the smaller 2003 4L80E solenoid kit replaces them all in the same job. Refill with Dexron VI, set the level hot, and recheck line pressure in Drive and Reverse.
| Fits | 4L80E 1994-2003 |
| Part type | Pressure Control 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.
It is the same black-body design family, but this one is GM-brand and listed through 2003. The 1994-2002 version is an aftermarket brand. Pick the one whose year range and branding suit your truck.
Usually it did not. Sonnax documents that the EPC circuit wears the AFL valve bore, which drops solenoid feed and line pressure. Contaminated fluid can also stick the solenoid screen. Check both before blaming the part.
Not if the transmission still has its original valve body. 1991-93 units used a different silver solenoid and different oil passages. Send us your VIN if the history of the valve body is unknown.
If they are original and the pan is already down, it is cheap insurance. A complete solenoid kit costs less than a second pan drop.
One rated to at least 325-350 psi. GM lists a maximum of 324 psi in Reverse at greater throttle, which will overrange a 300 psi gauge.
