4T65E Pressure Control Solenoid 2003, new and ready to install. Fits the 4T65E. Ships fast from the USA.
This is the single pressure control solenoid for a 2003 4T65E, the year GM introduced the revised valve body in cars like the Chevrolet Impala and Monte Carlo, Buick Century, Regal and LeSabre, and Pontiac Grand Prix. It is the right buy when a scan tool or a line pressure test has already pointed at this one solenoid and the shift solenoids, converter clutch solenoid and switch plate are fine. The photo shows the later-style solenoid with the silver body, the connector on the side and the spool valve on the nose.
Line pressure in the 4T65E is set electronically. The computer varies the current through this solenoid, and the solenoid in turn varies the signal oil sent to the pressure regulator's boost valve. More current lowers line pressure for smooth, light-throttle shifts; less current raises it so clutches clamp hard under load. Because every clutch in the unit is applied with line pressure, a solenoid that sticks or loses its range affects every gear, not just one shift. Its feed oil comes from the actuator feed limit valve, held to roughly 115 psi according to Sonnax.
P1811 alone does not prove the solenoid is bad. On this unit it also comes from worn 2nd and 3rd clutch packs, and Sonnax lists a worn pressure regulator boost valve and a worn AFL bore as causes of low line rise and erratic pressure.
Measure the solenoid's resistance through the case connector, then unplug it at the valve body and measure it directly. If the two readings differ, the internal harness is the fault, not the solenoid. A gauge on the line pressure tap tells you whether pressure follows the command. Our pressure control solenoid symptoms guide explains the test, and the 4T65E delayed engagement guide helps if the complaint is a slow shift into gear rather than a harsh one.
The listing covers the 2003 model year 4T65E. 2003 was a changeover year, so check what is actually in your transmission: the later solenoid looks like the one pictured, while 1997-2002 units use the earlier style, sold here as the 1995-2003 single pressure control solenoid. Match the connector and body shape with your old part, or send us your year and VIN and we will confirm. If several solenoids are suspect, the 2003-2011 4T65E solenoid kit replaces the full set in one job. All parts for this unit are on the 4T65E collection page.
Drain the pan, then remove the side cover to reach the valve body. Unbolt the solenoid retainer, pull the old solenoid straight out, and look at its inlet screen; heavy debris there means the fluid and filter are due as well. Oil the new O-rings and press the solenoid in by hand until it seats before refitting the retainer, and do not overtighten the small bolts in the aluminum. Inspect the internal harness while the cover is off. The converter clutch solenoid sits on the same valve body; if you have lockup codes too, the 2003 4T65E TCC solenoid is worth doing at the same time. Refill with DEXRON-VI and check the level with the fluid hot, then clear codes and reset the adapts so shift times relearn with the new part.
| Fits | 4T65E 2003 |
| Part type | Pressure Control Solenoid |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. This listing is the single pressure control solenoid shown in the photo. The 2003-2011 solenoid kit includes the full set.
2003 was a changeover year. Compare your old solenoid's body and connector with the photo, or send us your year and VIN and we will confirm before you order.
P0748 and P0960 are circuit codes for this solenoid. P1811 can be the solenoid, but it is also caused by worn clutches or a worn AFL valve bore.
Yes. It is on the valve body behind the side cover, so it can be replaced in the car after draining the fluid.
GM specifies DEXRON-VI. It is also back-serviceable into earlier DEXRON-III applications.
