4L60E Remanufactured Master Solenoid Kit with Pressure Switch

A remanufactured kit is the budget way to refresh every solenoid in a GM 4L60E, 4L65E or 4L70E without buying a valve body. It is aimed at the owner of a Blazer, Astro, Safari, Trailblazer, Colorado, Canyon or full-size GM truck from the mid 1990s through 2012 that has gone into limp mode, lost its 1-2 or 2-3 shift, or set more than one electrical code at a time. In the box: the EPC pressure control solenoid, the TCC PWM solenoid, the 3-2 downshift solenoid, the A and B shift solenoids and the pressure switch manifold (often called the TFP switch).

What these parts do in a 4L60E

The A and B solenoids are on/off valves that choose the gear. The EPC solenoid is a variable valve that sets line pressure, the TCC PWM solenoid feathers the converter clutch on, and the 3-2 solenoid controls the 2-4 band during a kickdown. The pressure switch manifold reports manual valve position back to the PCM. Together they are the whole electrical control of the transmission, which is why a fault in any one of them can drop the truck into a fixed gear with high line pressure, the fail-safe that drivers call limp mode.

Symptoms this kit is used for

• Limp mode: the truck takes off in a higher gear and shifts firmly or not at all
• Two or more codes at once, such as P0753, P0758 and P0785 together
• P0748 with a harsh engagement into drive or reverse
• Converter that will not apply, or shudders when it does
• Range codes like P1810, or a shift indicator that disagrees with the lever

How to confirm it is the solenoids

A group of solenoid codes at once often points to something they share, not five parts failing on the same day. ATRA's bulletin on 4L60E limp mode with an inoperative cluster and multiple solenoid codes points to a shared circuit fault as the most likely cause, and a separate ATRA bulletin traced the same code group to one bad crimp. Test the circuits at the case connector before you drop the pan: ATRA lists 20 to 40 ohms for the shift solenoids and 3.5 to 8.0 ohms for the EPC. If one circuit reads open or shorted and the rest are fine, the kit is the right fix. If the 3-2 downshift is harsh with no code, check the valve body too, because Sonnax notes that the 3-2 control valve spring on late units often breaks and causes a 3-2 bind. Our 3-2 solenoid and P0785 guide and shift solenoid testing guide go deeper.

Fitment and what to check

This kit is listed for GM 4L60E, 4L65E and 4L70E applications from the mid 1990s through 2012. That span covers more than one connector and solenoid generation, so treat the listing as a starting point, not a guarantee for your exact truck. Compare the connector colors and shapes in the photos with what is on your valve body, and confirm year, engine and the OE part numbers on your old solenoids before ordering. If you want a second set of eyes, send us your year and VIN. If your truck is a 2003-on and you would rather have all new parts, see the new 5-piece 2003-on kit; for 1996-2002 trucks there is also a refurbished kit built for that range. The full lineup is on the 4L60E parts page.

About the remanufactured condition

Every solenoid and the pressure switch is checked before it ships. Expect light surface marks on the bodies; they do not affect function. What matters is that the coils, valves and switches work, and that is what is tested.

Install notes

• Drop the pan and filter, then unplug and remove one part at a time so every connector returns to its own component.
• Coat each O-ring with clean ATF and push each solenoid fully into its bore before fitting the retainer.
• Bolt the pressure switch manifold down evenly and to factory torque so its seal is not crushed on one side.
• Replace the filter and pan gasket, refill with Dexron VI, and set the level hot with the engine idling.
• Clear codes and run an adaptive relearn. If the 1-2 shift was soft before the failure, a 4L60E shift kit can go in during the same service.

Is this kit new or used?

Remanufactured. Each solenoid and the pressure switch is checked before it ships. There may be light cosmetic surface wear that does not affect function.

Which trucks does it fit?

It is listed for GM 4L60E, 4L65E and 4L70E applications from the mid 1990s through 2012, including Blazer, Astro, Safari, Trailblazer, Colorado and Canyon. Connectors changed during that span, so match the photos to your valve body or send us your year and VIN.

My truck is in limp mode with several codes. Will this fix it?

Possibly, but check the shared power and ground circuits and the case connector first. Several solenoid codes at once are often a wiring fault rather than several failed solenoids.

Does the kit include the TCC enable solenoid or the internal harness?

No. It includes the TCC PWM solenoid, the four other valve body solenoids and the pressure switch manifold. The harness is sold separately.

What fluid do I use?

Dexron VI ATF. Refill what was drained and check the level hot with the engine running in park.

• 4L60E 3-2 Downshift Solenoid and Code P0785: What It Really Means
• 4L60E Shift Solenoid Symptoms, Testing and Replacement
• 4L60E P0748: Pressure Control Solenoid Failure - Causes, Diagnosis, and Fix
• 4L60E Common Problems, Symptoms, and What to Actually Do About Them