Full 4L60E solenoid set with internal harness, pressure switch manifold, filter and pan gasket for GM 4L60E and 4L65E. One pan drop does it all.
This is the do-it-once service kit for a GM 4L60E or 4L65E that is setting shift solenoid performance codes, falling into limp mode, or engaging hard into drive. It packs the full set of solenoids, the internal wiring harness with the pressure switch manifold attached, and a new filter and pan gasket, so a 1993-2002 Tahoe or Yukon, a 1994-1996 Buick Roadmaster wagon with the 5.7L, or a 1993-1996 Cadillac Fleetwood can be refreshed with nothing else to order for the pan drop.
Inside the pan, the 4L60E is run by electrically switched valves. Shift solenoids A and B select the gear by their on/off combination; ATRA's GEARS chart classes the 4L60E as a Type 1 unit, with both solenoids on in first and both off in third. The pressure control (EPC) solenoid sets line pressure and therefore how firm each shift feels, the TCC solenoids apply the converter clutch, and the 3-2 solenoid governs the downshift into third. Every one of these hangs off the internal harness, which also carries the pressure switch manifold that tells the computer where the shifter is. Heat cycles make that harness brittle over the years, and a cracked wire or chafed jacket produces intermittent codes no solenoid swap will cure. That is why this kit includes the harness rather than just the coils.
A performance code (P0751, P0756) means the computer saw the wrong result after commanding a solenoid; it does not prove the solenoid is dead. Check fluid level and condition first, then the external case connector. ATRA Bulletin 583 shows a single bad terminal crimp can set several solenoid codes at once on these units. Next, measure each circuit through the case connector using the pin map in ATRA Bulletin 269. If the coils and harness check out, valve body bore wear is the next suspect, and Sonnax's vacuum test guide explains how to find it. Our 4L60E shift solenoid symptoms and testing guide covers the full process, and harsh engagement specifically is covered in the P0748 pressure control solenoid guide.
The listing covers 1993-2005 GM 4L60E and 4L65E transmissions, with the Tahoe, Yukon, Roadmaster and Fleetwood applications named above. Be careful around the middle of that range: GM changed the harness style in 2003, so the harness and pressure switch manifold on a 2003-2005 unit may not match one from 1993-2002. Before ordering, pull up the product photos and compare the case connector and pressure switch manifold to what is in your transmission, or send us your year and VIN and we will confirm. Browse every version we stock on the 4L60E parts page.
If the old harness was cooked, look hard at what made it hot. A shift kit such as our 4L60E shift kit firms up apply pressure while the pan is off, and a 6AN braided cooler line kit is worth adding if you are plumbing in a larger cooler for towing.
| Fits | 1993-2005 GM 4L60E, 4L65E (confirm harness style) |
| Includes | Shift A/B solenoids, 3-2 solenoid, TCC solenoids, EPC solenoid, internal harness with pressure switch manifold, filter, pan gasket |
| Weight | 3 lb |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is listed for 1993-2005, but the harness style changed in 2003. Compare your case connector and pressure switch manifold to the product photos, or send us your year and VIN to confirm before ordering.
Yes, the listing includes the 1994-1996 Buick Roadmaster wagon with the 5.7L and the 1993-1996 Cadillac Fleetwood, both of which use the 4L60E.
No. A filter and pan gasket are in the box, so the only other thing you need for the job is Dexron VI fluid.
If the cause is a sticking solenoid or a damaged harness, yes. Those are performance codes, so also rule out low fluid and worn valve body bores, which can set the same codes.
Clear the codes and drive through every gear and into lockup several times. Shifts may feel slightly different until the computer adapts to the new parts.
