All five electrical solenoids for a GM 4L60E, 4L65E or 4L70E valve body: 1-2 and 2-3 shift, 3-2 downshift, EPC and TCC/PWM, 1993-2006.
This is a set of five factory GM solenoids, cleaned and checked after being pulled from 4L60E-family transmissions, for owners of 1993-2006 Chevrolet and GMC trucks and SUVs who want original-equipment parts back on the valve body without paying for every piece new. It covers the A (1-2) shift solenoid, the B (2-3) shift solenoid, the 3-2 downshift solenoid, the EPC pressure control solenoid and the TCC PWM lockup solenoid. If your Silverado, Sierra, Tahoe, Yukon, Suburban, S10 or Blazer is stuck in second or third, flares on the 3-2 downshift, shudders on lockup, or is showing P0751, P0756, P0748 or P0742, these are the parts that control those functions. Expect a little residual fluid on them; that is normal for OE pulls.
The A and B shift solenoids are simple on/off valves. The computer switches them in four combinations to select 1st through 4th, and when power is lost both go off, which leaves the unit in its failsafe gear. That is why a dead circuit so often shows up as a truck that only pulls away in a higher gear. The EPC solenoid is the variable one: it regulates line pressure and therefore shift firmness, and it is the part most often worn out on this transmission. The TCC PWM solenoid controls how quickly the converter clutch applies and releases, while the 3-2 solenoid times the downshift when you push the throttle at speed. All five are fed from a regulated solenoid supply circuit in the valve body, so a sticking regulator valve or contaminated fluid can affect several of them together.
Start at the case connector with a meter. ATRA's resistance chart for this transmission puts both shift solenoids at roughly 20-40 ohms and the pressure control solenoid at 3.5-8.0 ohms. A reading outside the range points to a specific part; a good reading does not clear the hydraulics. Transmission Digest documented a 4L60E that had its solenoids and then a complete valve body replaced without fixing a second-gear start, because the real cause was elsewhere, so check line pressure and fluid condition before spending money. Our 4L60E shift solenoid symptoms and testing guide lays out the pin tests, and the 3-2 downshift solenoid and P0785 guide covers the downshift circuit.
The listed fitment is GM 4L60E, 4L65E and 4L70E, 1993-2006. That is a long span, and GM changed the solenoid lineup inside it. The 1993-1994 units used a PWM-type 3-2 solenoid and had no PWM converter solenoid; the PWM TCC solenoid arrived in 1995 alongside the on/off TCC solenoid; and from 1996 the 3-2 solenoid became an on/off type. Fitting the wrong style sets codes even though the part is good. Compare each solenoid in this set to the one you are removing for body shape, connector and mounting before installing, and keep your original on/off TCC solenoid in place, since it is not one of the five pieces here. If you would rather we check, send your year and VIN. Browse everything we carry for this unit on the 4L60E parts page.
Drop the pan, remove the filter and unplug the internal harness. Work one solenoid at a time so none ends up in the wrong location: pull its clip or bolt, compare the old and new parts side by side, wet the new O-rings with clean Dexron VI and press it in square. Inspect the harness while you are there; this set does not include one, and a heat-cracked harness will undo the repair. If yours is brittle, a kit such as the master solenoid kit with harness, filter and gasket may be the better buy. Fit a new filter and pan gasket, torque the valve body and pan bolts to spec, refill with Dexron VI and clear codes before road testing. If line pressure was the complaint, pair this set with a new 1997-2005 pressure control solenoid rather than relying on a used EPC.
| Includes | 1-2 (A) shift, 2-3 (B) shift, 3-2 downshift, EPC pressure control, TCC/PWM solenoids |
| Condition | Refurbished (OE pulls) |
| Fits | GM 4L60E, 4L65E, 4L70E 1993-2006 |
| Weight | 1.96 lb |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. They are refurbished original GM solenoids removed from factory transmissions, which is why they cost less than a new full set. A small amount of residual fluid is normal.
Check carefully. 1993-1994 units used a PWM 3-2 solenoid and no PWM converter solenoid, which differs from 1996-up parts. Match each piece to your originals or send us your VIN before ordering.
No. The five pieces are the two shift solenoids, the 3-2 solenoid, the EPC solenoid and the TCC PWM solenoid. Reuse your on/off TCC solenoid and inspect the harness before reinstalling it.
If the cause is a dead shift solenoid circuit, yes. Check the fuse, the solenoid feed and the resistance of each solenoid first, because the same symptom can come from wiring, a pressure problem or the valve body.
Dexron VI automatic transmission fluid, which is also what you should use to lube the new O-rings.
