4L80E Pressure Control Solenoid 1993-02, new and ready to install. Fits the 4L80E. Ships fast from the USA.
This new GM pressure control solenoid covers the 4L80E from 1993 through 2002, listing reference 24203101. That span takes in the heavy-duty Chevrolet and GMC 2500 and 3500 pickups, Suburban 2500s and the full-size vans of the era, including a lot of 6.5L diesel and 7.4L big-block trucks that have spent their lives towing. If yours has started slamming into gear, or the shifts have gone long and mushy and the fluid smells cooked, this is the first electrical part to test.
The 4L80E replaced the cable-operated TH400 in these trucks, and with the throttle valve cable gone, the control module needed a way to raise line pressure under load. This solenoid, also called a force motor, is that way. The module feeds it a varying current, the spool inside bleeds torque signal oil, and that signal moves the pressure regulator valve in the pump. The current works backwards from what most people expect: in the GM service data a near-zero command gives roughly 157-177 psi at idle in Park, while about 1.0 amp drops it to 35-55 psi. When the module cannot verify the current it is sending, it sets the pressure control code and quits regulating, so line pressure goes to maximum and every shift becomes a bang.
Unplug the internal harness at the case connector and read the EPC across pins C and D: the factory chart wants 3.5-5.2 ohms. Then fit a gauge rated to at least 325 psi and run the scan tool override sweep in Park. If pressure stays high no matter what current you command, the solenoid, its wiring or the module is the problem. If pressure is low at every step, including zero current, look at the pump instead; a new solenoid will not raise it. Our EPC solenoid symptoms guide has the full amperage-to-pressure table, and the low line pressure guide walks through the pump, boost valve and diesel injection pump checks.
This range straddles a running change that matters. ATRA Technical Bulletin 266 documents that 1991-93 units left the factory with a Bosch-built solenoid that has a silver body, and 1994-on units got a Holley-built design with a black body, an enlarged spool valve, an added spring and revised oil channeling. The two are not interchangeable, and ATRA specifically warns that putting the older Bosch unit in a later transmission causes high line pressure. Because the listing runs from 1993, pull your old solenoid and note its color before you order, and compare its connector and body with the photos here or match the 24203101 reference. A 1993 truck whose valve body has already been swapped for a later one needs the later design. If you are unsure, send us your year and VIN. Year-specific alternatives, including the 1994-2003 version, are on the 4L80E parts page.
The solenoid sits on the valve body, so this is a pan-off job with the transmission in the truck. Drain, drop the pan, pull the filter, unplug the connector and remove the retainer. Look at the bore before you push the new part in; scoring or heavy varnish there will leak torque signal oil past any new solenoid. Lubricate fresh O-rings with ATF and seat it by hand. These trucks originally took Dexron IIE or III, and Dexron VI is fully back-serviceable for those applications, so refill with Dexron VI and set the level hot. On a 25-year-old transmission, check the case pass-through connector and the brittle insulation on the original 1991-2003 internal wiring harness while the pan is down, because a cracked wire sets the same code as a dead solenoid. Finish with a line pressure reading at idle and at greater throttle in Drive and Reverse.
| Fits | 4L80E 1993-02 |
| Part type | Pressure Control Solenoid |
| Condition | New |
| Brand | GM |
| Reference | 24203101 |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Possibly, but 1993 is the last year of the silver Bosch design and the change to the black Holley design came with 1994 production. Check the color of the solenoid you remove and compare it to this one, or send us your year and VIN before ordering.
ATRA documents that the older Bosch unit installed in a later transmission causes high line pressure, which means harsh shifts. The oil circuit in the valve body changed along with the solenoid.
Test before you buy. On 1994-and-later 6.5L trucks a leaking injection pump can make the engine pull at very low pedal, so the module commands low line pressure with a good solenoid. Check line pressure and the pedal position reading first.
Yes. Dexron VI is rated as back-serviceable for Dexron III and IIE applications, which covers these trucks.
A filter and pan gasket at minimum. On original-harness trucks, inspect the internal harness and case connector, since a cracked wire sets the same pressure control code.
