4L60E Solenoid Kit 1993-02

Owners of 1993-2002 Chevy and GMC pickups, Tahoes, Suburbans, S10s, Blazers, Camaros and Corvettes tend to find this page after the same handful of complaints: the transmission takes off in 2nd, skips a gear, never shifts into overdrive, slams the 1-2 shift, or lets the rpm wander on the highway because the converter will not stay locked. When the electrical side of a first-generation 4L60E is to blame, a new solenoid kit puts known-good parts on the valve body instead of guessing which one failed. This kit is new, sold for 1993-2002 units, and backed by a 1-year warranty.

What the solenoid kit does in a 1993-2002 4L60E

Gear selection in the 4L60E comes down to two on/off solenoids, A and B, which shift the 1-2 and 2-3 valves in four combinations. Line pressure, and so shift firmness, is set by the pressure control solenoid, which the computer drives with a varying current. The torque converter clutch is enabled by an on/off TCC solenoid, and the 3-2 solenoid manages downshift timing. The trick with this year range is that the early transmissions were not all wired the same. The 1993-1994 units used an on/off TCC solenoid only and a PWM-style 3-2 downshift solenoid. In 1995 GM added a PWM TCC solenoid to control how smoothly the converter applies, and in 1996 the 3-2 solenoid became an on/off type.

Those changes matter when you buy a kit. Putting an early-style transmission or solenoid set into a later truck is a known cause of PWM TCC and 3-2 solenoid codes even when every part is new.

Symptoms of worn solenoids in early 4L60E units

• Second-gear starts or no upshift until the truck is restarted
• P0753 or P0758 shift solenoid circuit codes
• Slamming or slipping shifts and P0748 from a failing pressure control solenoid
• Converter that will not apply or that cycles in and out, with P0740 or P1860
• A thump on coast-down or a late kickdown with P0785

How to confirm the problem before you buy

Start with the codes, then measure each solenoid at the transmission case connector. The shift solenoids should read about 20-40 ohms and the pressure control solenoid about 3.5-8 ohms. On trucks this old, check the connector and harness too: ATRA has documented a poor terminal crimp on the shared solenoid power circuit setting P0740, P0753, P0758, P0785 and P1860 together. Our 4L60E solenoid symptoms and testing guide shows the pin layout, and the 3-2 downshift solenoid and P0785 guide explains that code in detail. If the electrical checks pass, look at valve body wear before you spend money on solenoids.

Fitment

This kit is listed for 1993-2002 4L60E transmissions. Because the TCC and 3-2 solenoid types changed in 1995 and 1996, compare the solenoids in your pan and the connector shapes to the product photos before ordering, or send us your year and VIN and we will check the match. A 2003 or newer transmission uses a different internal harness and is not covered here. Every part we carry for this unit is on the 4L60E parts page, including the 1993-2002 master kit with harness, filter and gasket if your harness is also cracked.

Install notes

• Drop the pan and filter and inspect the debris before anything else; heavy clutch material means the hard parts need attention.
• Unplug the case connector from inside and remove the solenoids one at a time so each new one goes back in the same bore.
• Oil each new O-ring with ATF and push each solenoid fully home before installing its retainer.
• Inspect the internal harness for heat-hardened insulation and the connector for green corrosion at the pins.
• Refill with Dexron VI, the current replacement for the earlier Dexron fluids, then clear codes and drive the truck through several full shift cycles.

If the range indicator or the start circuit acts up too, the external 4L60E transmission range switch is a common partner repair. Worn valve body bores call for a remanufactured 1996-2000 valve body.

Will this kit work in my 1994 truck?

It is listed for 1993-2002, but 1993-1994 units used a PWM 3-2 solenoid and no PWM TCC solenoid. Compare your solenoids and connectors to the photos or send us your VIN so we can confirm the match.

Why do I have TCC PWM and 3-2 codes after swapping transmissions?

An early 1993-1994 style transmission installed in a 1995 or 1996-up truck is known to set PWM TCC and 3-2 solenoid codes because the solenoid types changed. Make sure the solenoids match the truck's year.

Does it come with a harness?

This listing is the solenoid kit. If your internal harness is cracked or brittle, the 1993-2002 master kit with harness, filter and gasket replaces everything at once.

Is there a warranty?

Yes. The kit is new and carries a 1-year warranty.

What fluid goes in after the install?

Use Dexron VI. It replaces the earlier Dexron fluids these transmissions were filled with. Check the level hot with the engine running.

• 4L60E Shift Solenoid Symptoms, Testing and Replacement
• 4L60E 3-2 Downshift Solenoid and Code P0785: What It Really Means
• 4L60E EPC (Pressure Control) Solenoid: Function and Failure
• 4L60E Common Problems, Symptoms, and What to Actually Do About Them