4L60E Pressure Control Solenoid 2004-2024

Late-model 4L60E owners searching for a fix to a firm bang on the 1-2, slipping under tow, or a P0748 code land on the pressure control solenoid sooner or later. This is a new BorgWarner EPC solenoid, reference number 24224905, listed for 4L60E transmissions from 2004 onward. That covers the GMT800 and GMT900 Silverado and Sierra 1500, Tahoe, Yukon, Suburban, Avalanche, Express and Savana vans and the Colorado and Canyon trucks that used the 4L60E. It has a 1-year warranty.

What the pressure control solenoid does in a late 4L60E

Line pressure in the 4L60E is set by current, not by a cable. The control module sends this solenoid a variable current and the solenoid turns it into a control oil signal on the boost valve, which sets how hard the pressure regulator works. More current means less line pressure. The solenoid does not see raw pump pressure: it is fed by the actuator feed limit (AFL) valve, which Sonnax describes as holding solenoid feed at about 80 to 115 psi for the EPC and shift solenoids in the 4L60-E, 4L65-E and 4L70-E. On a truck with 150,000 miles or more, that matters because Sonnax also reports that EPC duty cycling wears the boost valve sleeve over time. A late unit with soft shifts can have a weak solenoid, a worn boost valve, or both.

Symptoms on 2004 and later trucks and vans

• P0748 stored for the pressure control solenoid circuit
• Harsh engagement into Drive or Reverse and firm, abrupt upshifts
• Soft or slipping 2-3 and 3-4 shifts under load, the usual path to a burned 3-4 clutch pack
• Poor line rise on acceleration, felt as slip on the 2-4 band or 3-4 clutch when you get into the throttle
• Shift quality that drifts as the fluid heats up on a long pull

How to confirm it before buying

On these years, a harsh shift alone does not prove a bad EPC. GM bulletin PIP5009G covers 2012 Colorado, Express, Silverado, Canyon, Savana and Sierra with the 4L60E built after 10/01/11 that show a harsh 1-2 shift with P0741, and the fix there is the TCC enable solenoid and internal harness, part 24237980, not the pressure control solenoid. So read every code, current and history, before choosing a part. To check the EPC, measure resistance at the solenoid and then put a gauge on the line pressure tap. If the circuit is good but pressure will not rise with throttle, Sonnax points to the AFL valve and the pressure regulator and boost valve bores. Our P0748 diagnosis guide lays out the test order, and the TCC solenoid diagnosis article covers the converter clutch side of the same valve body.

Fitment: 2004 and later

The listing is for the 4L60E from 2004 forward. GM phased the 4L60E out of most light trucks after the 2013 model year, so on later vehicles confirm what you actually have. The RPO code on the glovebox or spare tire label tells you: the 4L60E is RPO M30, and related units such as the 4L65E and 4L70E carry their own codes. Then compare the connector and body of your old solenoid with the photos, check for the 24224905 reference, or send us your year and VIN and we will match it. If your vehicle is older, see the 1994-2003 pressure control solenoid, and every 4L60E part we stock is on the 4L60E parts page.

Install notes

• Drain the pan, pull the filter and look at the debris. Heavy clutch material means the solenoid is not the only problem.
• Remove the retaining bracket, disconnect the solenoid from the internal harness and draw it out of its bore. Check the bore and screen for varnish or metal.
• Fit the new solenoid with ATF on the O-rings, seat it by hand and reinstall the bracket.
• A 4L60E pan, filter and gasket service kit gives you a drain plug for future fluid changes. If the other solenoids are original, the 2003-2005 solenoid kit with harness and filter replaces them at the same time.
• Refill with Dexron VI and set the level hot. Clear codes, reset transmission adapts with a scan tool, and verify line pressure on a road test.

My truck is a 2015 or later. Does it have a 4L60E?

Most GM light trucks moved away from the 4L60E after 2013. Check the RPO code on the glovebox or spare tire label; the 4L60E is M30. If you are not sure, send us your year and VIN before ordering.

What does reference 24224905 mean?

It is the reference number shown on this listing. Compare it with the number on your old solenoid, along with the connector and body shape, to confirm a match.

My 2012 Silverado has a harsh 1-2 shift. Is it this solenoid?

Possibly, but check for P0741 first. GM bulletin PIP5009G says 2012 trucks with the 4L60E built after 10/01/11 that show a harsh 1-2 with P0741 need the TCC enable solenoid and internal harness 24237980.

What else should I replace with it?

A new filter, pan gasket and Dexron VI fluid at minimum. On a high-mileage unit, replacing the other original solenoids and the internal harness while the pan is off is cheaper than a second job later.

Is there a relearn after installing it?

Clear codes and reset the transmission adaptive values with a scan tool if it supports that function. Then drive through a range of light and heavy throttle shifts so the module can relearn.

• 4L60E P0748: Pressure Control Solenoid Failure - Causes, Diagnosis, and Fix
• 4L60E TCC Solenoid and Code P0740: Diagnosis and Replacement
• 4L60E Low Line Pressure: Pressure Regulator and Boost Valve Wear, and the Real Fix
• 4L60E Line Pressure Specs and How to Test Them