4L65E Pressure Control Solenoid 2004, new and ready to install. Fits the 4L65E. Ships fast from the USA.
This is a single new pressure control solenoid for a 2004 4L65E, GM brand, with a 1-year warranty. It is the late-style EPC: the photo shows a metal-bodied solenoid with a screened valve end and a black connector molded onto the side. If your 2004 Silverado, Sierra, Tahoe, Yukon, Suburban or Avalanche with the 5.3L or 6.0L V8 is shifting soft, flaring into third or fourth, banging into gear, or showing a pressure control code, and the other solenoids test fine, this is the part that sets line pressure for the whole transmission. At this price it is also a sensible part to replace while you have the pan down for other work.
There is no throttle valve cable on this transmission. The PCM decides line pressure by varying current to the pressure control solenoid, and the solenoid sends a signal to the pressure regulator and boost valve. More throttle or more load means the PCM asks for more pressure, so the clutch packs and the 2-4 band apply firmly. Less pressure at light throttle keeps shifts smooth. The 2004 valve body is the GM051 casting that Sonnax lists for 2003-2008 4L65E units, the casting where GM moved to the late-style EPC. That is why an early 1993-2002 style solenoid will not drop into a 2004.
Do not buy on symptoms alone. Read codes, then check line pressure with a gauge at idle in drive and reverse and again with throttle applied. Pressure that will not rise on command points at the EPC circuit, the pump, the AFL valve or a leak. Sonnax notes that a worn TCC regulator bore on this family drains line pressure and burns clutches, so a new EPC alone will not fix that. Also check the case connector and the internal harness for oil and broken wires, since either sets the same code. Our 4L65E common problems guide covers the pressure and 3-4 clutch link, and the Tahoe shift problems guide walks the SUV symptoms.
This listing is for the 2004 model year 4L65E. Confirm the transmission with RPO M32 on the glovebox sticker; M30 is the lighter 4L60E. The 2003-2008 4L65E valve bodies share the late-style EPC design, but compare the connector and body shape in the photo with the solenoid in your pan before ordering, and if you are unsure send us your year and VIN. Other years and versions are on the 4L65E collection page.
The EPC is serviced from under the truck. Drain the fluid, drop the pan and look at the magnet; heavy friction material means the clutches are already gone. Remove the filter, unplug the EPC connector, pull the retainer and slide the solenoid out of its bore. Look in the bore for scoring. Lube the new O-rings with Dexron VI, push the solenoid in square without forcing it, refit the retainer and plug the connector so the harness cannot rub the valve body. Install a new filter, making sure the old filter seal is out of the pump, then refill with Dexron VI and check the level hot. Re-check line pressure and clear codes. If the other solenoids are original, the 2003-2006 4L65E solenoid kit does them all at once, and a converter clutch code is a good reason to add the 2003-2006 TCC solenoid.
| Fits | 4L65E 2004 |
| 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.
Late-style. 2004 4L65E units use the GM051 valve body casting, which takes the late-style EPC. The early 1993-2002 solenoid is a different design.
No. This is the pressure control solenoid only. If you want every solenoid replaced, look at the 2003-2006 4L65E solenoid kit.
Those years are on the same GM051 late-style casting, but the listing is for 2004. Compare the connector and body shape with yours or send us your VIN.
The pressure control solenoid electrical circuit code. Check the harness and case connector, then the solenoid itself.
Clear codes and drive through every shift. Resetting the transmission adapts with a capable scan tool helps the PCM relearn shift timing on the new solenoid.
