Five replacement solenoids for the GM 4L60E, 4L65E and 4L70E: A and B shift, 3-2 downshift, EPC and TCC PWM, for 2003-up trucks and SUVs.
If your 2003-or-later Silverado, Sierra 1500, Yukon, Express 1500 or Colorado has started shifting late, holding one gear, banging into gear or shuddering at a steady 45 mph, and the scan tool shows codes like P0751, P0756, P0748, P0785 or P0741, this five-solenoid set covers every solenoid most likely to be behind it. It is a solenoids-only kit for the later GM 4L60E, 4L65E and 4L70E: no harness, no pressure switch, just the five valves that do the electrical work on the valve body.
The 4L60E has no throttle valve cable or governor. The PCM runs everything through solenoids fed by AFL oil, which Sonnax describes as regulated to roughly 115 psi before it reaches the shift, pressure control, TCC and 3-2 solenoids. Each of the five parts in this box has its own job:
Keep the known 4L60E failures in mind. Worn valve body bores can cause TCC slip and P0741 even with a new solenoid installed, and a burned 3-4 clutch pack or stripped sun shell will not be fixed by any electrical part.
Do the electrical checks before you buy. ATRA's resistance bulletin gives the shift solenoids at 20 to 40 ohms and the pressure control solenoid at 3.5 to 8.0 ohms, measured at the case connector. A reading in range does not clear a solenoid completely: Transmission Digest documented a 4L60E that kept setting P0758 with a B solenoid in spec that simply reacted too slowly. ATRA also warns that a single bad crimp can set several solenoid codes at once, so check the connector and wiring first. Our 4L60E shift solenoid testing guide walks through the full sequence, and the TCC solenoid and P0740 guide covers lockup codes.
The listing covers the GM 4L60E, 4L65E and 4L70E from 2003 and newer, including the Sierra 1500, Yukon, Express 1500 and Colorado. GM changed the EPC solenoid and pressure switch arrangement for 2003, so this set is not for 1993-2002 transmissions. Hold your old solenoids up to the product photos before you order, check connector shapes, and if you are unsure send us your year and VIN. You can see every other part we carry for this unit on the 4L60E parts page.
This is a pan-drop job. Drain the fluid, remove the pan and filter, and unplug each solenoid from the internal harness. The A, B and 3-2 solenoids come out after you pull their retaining clips; the EPC and TCC PWM are held by brackets. Wet each new O-ring with ATF and push the solenoid straight into its bore, because a rolled O-ring leaks pressure and brings the codes right back. Since there is no harness in this kit, inspect the old one for brittle insulation and loose pins while the pan is off. Refill with Dexron VI, clear the codes, and run a shift adapt relearn so the PCM stops correcting for the old parts.
A new filter and pan gasket go on with it; our 4L60E solenoid and filter service kit pairs well. If you only need the shift pair, the 4L60E shift solenoid A and B kit is the cheaper way in.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It is for the 2003-and-newer 4L60E, 4L65E and 4L70E. The 1993-2002 transmissions use a different EPC solenoid and pressure switch layout. Send us your year and VIN if you are not sure which you have.
No. It contains five solenoids only: A shift, B shift, 3-2 downshift, EPC and TCC PWM. If your harness is cracked or the pressure switch is leaking, choose one of our harness kits instead.
On a high-mileage unit the rest are usually close to the end too. Once the pan and filter are off, swapping all five costs less than coming back for each code later.
Use Dexron VI ATF and check the level hot, engine running, following the procedure for your vehicle.
You should have one. Clear the stored codes and run a shift adapt relearn so the PCM resets the shift pressure it learned around the worn solenoids.
