4T40E Pressure Control Solenoid 2004, new and ready to install. Fits the 4T40E. Ships fast from the USA.
If your 2004 or later Cavalier, Cobalt, Malibu, Sunfire, Grand Am, G5 or Saturn Ion slips on the 1-2 shift, bangs into gear, or has an EPC code stored, this listing is built around the part most people are searching for: the electronic pressure control (EPC) solenoid for the 2004-and-up 4T40E and 4T45E. It ships as a new matched set, not a single solenoid. As pictured you get the small-body Bosch-style EPC, the torque converter clutch (TCC) PWM solenoid, shift solenoids A and B, and the pressure switch manifold, so the whole electrical side of the valve body is renewed in one pan-off job.
The 4T40E (RPO MN4) and the heavier 4T45E (RPO MN5) have no throttle valve cable. Line pressure is set only by the EPC solenoid, a variable force motor that the engine computer feeds with a changing current. More current means lower pressure, less current means higher pressure, and the computer adjusts it every shift based on throttle, load and how long the last shift took. If the EPC sticks or loses force, every clutch and band in the transaxle sees the wrong apply pressure at once. That is why one tired EPC can feel like a slipping clutch pack, and why the other parts in this set matter too: shift solenoids A and B pick the gear, the TCC solenoid controls converter lockup, and the pressure switch manifold tells the computer which range the manual valve is in.
Check fluid level and condition first. Burnt, dark fluid with friction material in the pan means the 2nd or 4th clutch is already worn, and a new EPC will not bring it back. Next, read every code and measure the EPC circuit at the case connector and again at the solenoid; our guide to testing a solenoid with a multimeter covers the meter setup. The surest test is a pressure gauge on the line tap while the computer commands pressure up and down; our line pressure testing walkthrough explains how to read the result. If line pressure is low no matter what is commanded, TransGo documents pressure regulator bore wear on every 4T40E and 4T45E built since 1995, and a solenoid alone will not fix a worn bore.
This set is listed for 2004 and later 4T40E and 4T45E transaxles. 2004 is exactly when GM changed this valve body. Sonnax identifies the 2004-2005 body by casting 24216020: it uses the small Bosch EPC and has only 3 oil feed holes for the pressure switch manifold, where 1997-2003 bodies used a large Delphi EPC and a 6-hole manifold. The two EPC styles share the same bore and the same connector, so the wrong one installs without complaint. A large Delphi unit in a 2004 car gives soft, slipping shifts; a small Bosch unit in a 2000-2002 car gives harsh shifts that may not adapt out, often with no code. Saturn switched to the Bosch EPC a year early, in 2003. Before ordering, read the casting number on your valve body or compare your old EPC and manifold with the photo, check the MN4 or MN5 code on the service parts label, or send us your year and VIN. For a 1995-2003 car, see the 1995-2003 4T40E pressure control solenoid instead, and the full range is on the 4T40E and 4T45E parts page.
Everything in this set mounts to the valve body under the side cover or pan, depending on the car, so plan on draining the fluid first. Photograph the harness routing and note which bore each solenoid came out of; shift solenoids A and B look identical but must go back where the harness expects them. Lubricate every new O-ring with clean ATF, press each solenoid in square by hand before snugging its retainer, and torque the manifold bolts evenly so it seals across all of its feed holes. While the harness is exposed, flex it: hardened, cracking insulation causes the same codes as a dead solenoid, and the 4T40E internal wiring harness is the fix. Fit a new 4T40E/4T45E filter and pan gasket kit, refill with Dexron VI, and set the level hot. Then clear codes and reset the transmission adapts with a scan tool so the computer relearns pressure with the new EPC; expect a few drives before shifts fully settle. If the valve body itself is worn, a 2004-2005 4T40E valve body is the better repair.
| Fits | 4T40E 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.
It is a full new set. As pictured it includes the small Bosch-style EPC pressure control solenoid, the TCC PWM solenoid, shift solenoids A and B, and the pressure switch manifold. Replace only the parts you need, or renew all of them during one pan-off job.
Usually not. GM 4T40E and 4T45E valve bodies through 2003 use the large Delphi EPC and a 6-hole pressure switch manifold, and a Bosch EPC in a 2000-2002 car causes harsh shifts that may not adapt out. The exception is the 2003 Saturn L-Series, which already used the small Bosch EPC. Check your valve body casting or send us your year and VIN.
The Bosch unit is the slimmer, small-diameter solenoid shown in the photo; the Delphi is noticeably larger in diameter. Both fit the same bore and plug into the same connector, so compare your old part side by side or read the valve body casting number (24216020 on 2004-2005 bodies, 24233226 on 2006-2008).
Dexron VI. It is the current GM fluid that replaces earlier Dexron III in these transaxles. Fill through the vent or fill plug, run the engine, and set the level hot.
Yes. Clear the codes and reset the transmission adaptive values with a scan tool. The computer has been compensating for the old solenoid, and until it relearns, shifts can feel firm or slightly soft for the first few drive cycles.
Not always. The TCC solenoid in this set can, but TransGo documents pressure regulator bore wear on 4T40E and 4T45E units as a cause of those codes, burnt frictions and overheating. If the bore is worn, the valve body needs repair or replacement.
