4L60E Master Solenoid Kit, 2003-Up, 6-Piece Refurbished

This six-piece refurbished set is for owners of 2003-and-newer GM trucks and SUVs with the 4L60E, 4L65E or 4L70E who want to renew everything electrical that bolts to the valve body in one job. Beyond the usual five solenoids it includes the transmission fluid pressure switch manifold, the part that tells the computer which gear range the shifter has selected. If you are chasing a mix of shift, pressure and range complaints on a high-mileage Silverado, Sierra, Tahoe or Yukon, this is the box that covers all of them.

What this solenoid kit does in a 4L60E

Think of the late 4L60E valve body as having two kinds of electrical parts: outputs and an input. The outputs are the solenoids the computer drives. Shift solenoids A (1-2) and B (2-3) work as an on/off pair to select the four forward gears, the pressure control solenoid sets line pressure by varying current, the 3-2 control solenoid manages the overlap on kickdowns, and the TCC PWM solenoid feathers the converter clutch on. The input is the pressure switch manifold. As the manual valve moves, it routes fluid to different switches on the manifold, and the open or closed pattern of those switches is how the computer knows you are in Park, Reverse, Neutral, Drive or a manual range. A solenoid that sticks gives the wrong output; a manifold switch that leaks or sticks gives the computer bad information, and it will schedule shifts and pressure for the wrong range.

Symptoms this kit addresses

• Shift solenoid A or B codes (P0751, P0753, P0756, P0758) with a truck stuck in one gear
• P0748 or harsh, slipping or delayed engagements from a worn pressure control solenoid, a known 4L60E weak point
• Converter clutch that will not apply or shudders at light throttle, with P0740 or P0741
• P0785 or a bind on 3-2 downshifts
• Range-switch complaints from the pressure switch manifold, such as a P1810 code on many of these trucks, wrong range on the dash, or no fourth gear and no lockup because the computer thinks it is in a lower range

How to confirm before you order

Start with a scan tool: note every stored code and watch the pressure switch range reading while you move the shifter through each position with the engine running. A range that does not match the lever points at the manifold or its circuit. Next, check solenoid resistance at the case connector against the published values; ATRA's bulletin lists the shift solenoids at 20-40 ohms and the pressure control solenoid at 3.5-8.0 ohms. Our P0748 pressure control solenoid guide covers how to separate a worn EPC from a low-pressure mechanical problem, and the TCC solenoid and P0740 guide covers lockup faults.

Fitment

Listed for GM 4L60E, 4L65E and 4L70E units from 2003 and newer with the late-style connectors. It is not for 1993-2002 early-connector transmissions; those need a set like our refurbished 1996-2002 master solenoid kit. Later trucks that switched to an internal mode switch on the manual shaft no longer carry a pressure switch manifold on the valve body, so confirm yours has one before ordering. When in doubt, compare the connector shapes on your old parts with the photos or send us your year and VIN. All 4L60E parts are on the 4L60E collection page.

Install notes

• These are refurbished, cleaned and tested units, not new GM parts. Expect light cosmetic marks.
• Swap one part at a time so no connector ends up on the wrong solenoid.
• Clean the valve body face where the pressure switch manifold seats, use its gasket, and run the bolts down evenly in steps. An uneven manifold leaks pressure between ports and causes false range readings.
• Lube every O-ring with clean ATF, then fit a new filter and pan gasket and refill with Dexron VI.
• Clear codes and perform the shift adapt relearn, then road test through every range.

If you are in the pan because the truck also slips or flares, solenoids will not fix burned clutches. In that case plan on a rebuild with a kit such as the 2004 4L60E master rebuild kit and use this set to finish the valve body during reassembly.

What does the pressure switch manifold do?

It reads which gear range the manual valve is in. Fluid from the manual valve opens or closes the switches on the manifold, and the computer uses that pattern to know whether you selected Park, Reverse, Neutral, Drive or a manual range. A failing manifold can cause wrong shift timing, no fourth gear or no lockup.

Is this the same as a new GM set?

No. These are refurbished parts that have been cleaned and tested. They are a lower-cost way to renew all six pieces at once. If you want brand-new parts, look at our new 2003-and-later solenoid sets on the 4L60E collection page.

Will it fit a 1999 Tahoe?

No. This kit is for 2003 and newer units with the late connector style. A 1999 Tahoe needs a 1993-2002 or 1996-2002 early-style kit.

Should I replace the internal wiring harness too?

Inspect it while the pan is down. If the insulation is cracked or hard, or a connector lock is broken, replace the harness, because a bad terminal can set the same codes as a failed solenoid.

What fluid does a 2003-up 4L60E take?

Dexron VI automatic transmission fluid. Check the level hot with the engine running after the install.

• 4L60E P0748: Pressure Control Solenoid Failure - Causes, Diagnosis, and Fix
• 4L60E TCC Solenoid and Code P0740: Diagnosis and Replacement
• 4L60E Shift Solenoids A and B: Codes P0753 and P0758
• 4L60E Common Problems, Symptoms, and What to Actually Do About Them