4L60E Pressure Control Solenoid 1994-2003, new and ready to install. Fits the 4L60E. Ships fast from the USA.
A 1994-2003 Chevy or GMC truck, SUV or car with the 4L60E that slams into gear one day and slurs the next, or that has logged P0748, is usually telling you line pressure is no longer under control. The part that controls it is the pressure control solenoid, often called the EPC or force motor. This is a new GM-brand unit listed for the 1994 through 2003 model years, which spans the old square-body C/K trucks, the first GMT800 Silverado and Sierra, Tahoe, Yukon, Suburban, S10, Sonoma, Blazer, Camaro and Corvette. It comes with a 1-year warranty.
The 4L60E has no throttle valve cable. Line pressure is set electrically: the computer feeds this solenoid a varying current, and the solenoid meters a control oil signal to the boost valve, which pushes on the pressure regulator in the pump. Gears Magazine, the ATRA trade publication, describes the relationship as inverse and gives commanded current of roughly 0.9 to 1.1 amps at idle, falling toward 0.2 to 0 amps at wide-open throttle. In plain terms, the solenoid works hardest when you want the least pressure. When its coil weakens or its spool sticks, every clutch apply in every gear changes at once, which is why a bad EPC feels like the whole transmission went wrong instead of one shift.
Rule out the cheap causes first. Sonnax traced the start-up code pattern to cranking voltage dipping below about 10.5 volts, so a tired battery or corroded cables can set solenoid codes on a perfectly good part. With the battery healthy, unplug the case connector and measure the pressure control circuit; ATRA bulletin 269 puts it on pins C and D at roughly 3.5 to 8.0 ohms, which includes the internal harness. An open or shorted reading points to the solenoid or the harness. If the electrical side checks good, put a gauge on the line pressure port and compare to the numbers in our 4L60E line pressure guide. Our EPC solenoid function and failure article explains how to read the result, and when pressure is low with a good solenoid, the pressure regulator and boost valve wear guide is the next stop.
The listing covers 4L60E transmissions for the 1994 through 2003 model years. That range crosses one important line. GM revised the internal harness and solenoid layout for 2003, which is why our solenoid kits and harnesses are sold as 1993-2002 and 2003-up versions. If your vehicle is a 2002 or 2003, pull the pan and compare the connector and body of your old solenoid with the photos before you install, or send us your year and VIN and we will confirm it. The pressure control solenoid itself was carried across many of these years, but matching the part in hand is the only reliable check. For other year ranges, including a 1997-2005 version, see every option on the 4L60E parts page.
| Fits | 4L60E 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 listed for 1994-2003, but 2003 is the year GM changed the internal harness and solenoid layout. Compare the connector and body of your old solenoid with the photos, or send us your year and VIN and we will confirm before it ships.
No. P0748 is an electrical circuit code, so a damaged internal harness, a bad case connector or low system voltage can set it too. Measure the circuit at the case connector and check battery and cranking voltage before replacing the part.
Always a new filter and pan gasket and fresh fluid. If the other solenoids and harness are original on a high-mileage truck, replacing them in the same pan-off job saves doing the work twice.
Use Dexron VI automatic transmission fluid and set the level with the transmission at operating temperature.
Clear the codes, and if your scan tool supports it reset the transmission adaptive values. Then drive it through several gentle and firm shifts so the computer can relearn. A road test with a line pressure gauge connected is the best confirmation.
