Solenoid set for 1996-2002 GM 4L60E trucks, SUVs and cars: shift A and B, EPC and TCC solenoids to fix harsh shifts, slipping and P0750-P0770 codes.
This kit is for 1996-2002 GM trucks, SUVs, and vans with the 4L60E. Typical complaints include a Silverado that starts in second gear, a Tahoe that will not shift into overdrive, an Astro van that slams into gear, or a Sierra with high revs on the highway because the converter will not lock up. The kit replaces the four solenoids responsible for most of those problems: shift solenoid A (1-2), shift solenoid B (2-3), the EPC pressure control solenoid, and the TCC solenoid. Each is built to the original flow rate, coil resistance, and body dimensions, so line pressure and shift timing return to factory spec. It is also listed for the 4L65E and 4L70E from those years. The manufacturer part number is QMP-P12T0006, and the complete kit weighs 1.1 lb.
The 4L60E shifts all four gears with just two on/off solenoids. The PCM turns them on and off in a fixed pattern: both on for first, A off and B on for second, both off for third, and A on with B off for fourth. Because both solenoids are off in third, losing power to the solenoid circuit leaves the transmission stuck in third gear. The EPC solenoid operates differently. It is a variable-force unit that the PCM uses to raise or lower line pressure based on throttle and load, so it controls how firm each shift feels. The TCC solenoid applies the torque converter clutch for lockup at cruise speed. If one of these four fails, the transmission does exactly what the solenoid commands, even when that is the wrong thing.
Test the solenoids at the transmission case connector before buying parts. According to ATRA's resistance chart for this unit, shift solenoid A measures across pins E and A, shift solenoid B across E and B, and the TCC solenoid across E and T, all between 20 and 40 ohms. The EPC solenoid measures across C and D at 3.5 to 8.0 ohms. An open or shorted reading confirms a bad part. A reading within spec does not guarantee a solenoid is good, since some fail only under load, so match the symptom to the shift pattern above. Our 4L60E shift solenoid symptoms and testing guide explains that process in detail. For pressure problems, see the P0748 pressure control solenoid guide, and for lockup problems, see the TCC solenoid and P0740 diagnosis guide. If a vacuum test shows worn valve body bores, new solenoids alone will not fix the problem.
This kit is listed for 1996-2002 4L60E applications. That includes the 1996-2002 Silverado and Sierra 1500-3500, Suburban 1500-2500, Tahoe and Yukon, Astro and Safari vans, Bravada and Firebird, the 1999-2002 Escalade ESV and EXT, the 1997-2000 Isuzu Hombre, and the 1996 Roadmaster, Fleetwood and Brougham. For 2003 and later, GM changed the solenoids, so use our 2003-2007 4L60E solenoid kit instead. This kit has four pieces and does not include the 3-2 downshift solenoid. If you have a 3-2 problem or code P0785, check the 7-piece master solenoid kit. If you are not sure which unit you have, compare the old solenoids side by side with the new ones, or send us your year and VIN. You can find all other 4L60E parts on the 4L60E parts page.
All four solenoids are accessible with the transmission in the vehicle. Drain the fluid, then drop the pan and remove the filter. Unplug the internal harness at each solenoid. Shift solenoids A and B come out after you pull their retaining clips. The EPC and TCC solenoids are held in by bolts. Coat each new O-ring with fresh ATF and seat the solenoids by hand so the seals do not roll. Inspect the internal harness as you go. Heat-cracked insulation or loose terminals can cause the same codes, so replace the 1993-2002 internal wiring harness too if yours is brittle. Install a new filter and pan gasket, refill with Dexron VI, check the level hot, clear the codes, and road test through all four gears and lockup. A light coat of assembly lubricant on the new parts is normal.
| Transmission | GM 4L60E, 4L65E, 4L70E (1996-2002) |
| Includes | Shift solenoid A, shift solenoid B, EPC solenoid, TCC solenoid |
| Weight | 1.1 lb |
| Manufacturer part number | QMP-P12T0006 |
| Condition | New aftermarket |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Shift solenoid A (1-2), shift solenoid B (2-3), the EPC pressure control solenoid and the TCC solenoid. The 3-2 downshift solenoid is not included.
No. This set is for 1996-2002 4L60E applications. GM changed the solenoids for 2003, so later trucks need the 2003-and-up solenoid kit.
Check resistance at the case connector. Shift and TCC solenoids should read 20-40 ohms and the EPC 3.5-8.0 ohms. If the readings are fine at the solenoid but not at the case connector, the problem is in the internal harness. A whole group of codes setting at once often points to a fuse, ground or crimp problem.
Usually not both. The 4L60E defaults to third with both shift solenoids off, so a stuck-in-third truck usually has lost power or ground to the solenoid circuit. Check the fuse and harness before replacing parts.
Dexron VI ATF. It replaces the earlier Dexron III that originally came in these trucks and is the current GM specification.
Clear the stored codes, then road test through all four gears and converter lockup. Check the fluid level hot and look for leaks at the pan gasket.
