4L60E Master Solenoid Kit, 5-Piece EPC and Shift Set 2003-Up

Later GM trucks and SUVs with the 2003-up 4L60E, 4L65E or 4L70E tend to come in with the same complaints: a converter that shudders at a steady cruise, late or soft upshifts, a truck stuck in one gear, or a code like P0751, P0756, P0748 or P0741. When the valve body is coming down anyway, this five-piece set lets you renew every solenoid that bolts to it with new parts, each matched to its GM number.

What is in the box and what each part does

• Two shift solenoids, 24230298: the 1-2 (A) and 2-3 (B) solenoids. Together they select all four gears.
• EPC pressure control solenoid, 24248893: the later-style variable-force solenoid that sets line pressure. When it wears, shifts go soft or harsh and P0748 can set.
• TCC PWM solenoid, 24227792: modulates converter clutch apply so lockup is smooth. A tired PWM solenoid is a classic source of lockup shudder and P0741.
• 3-2 downshift solenoid, 24212327: controls 3-4 clutch release timing on a kickdown, so a weak one shows up as a flare or bind on 3-2.

What it does not include matters too. There is no internal harness, no pressure switch manifold and no TCC enable (on/off) solenoid in this set. If your harness is cracked or oil-soaked, choose a harness kit such as our 4L60E 9-piece master solenoid kit with harness for 2003-2006 instead.

Symptoms on a 2003-up unit

• Converter shudder or slip at light throttle, with or without P0741.
• P0751 or P0756 performance codes: the computer commanded a gear the transmission did not deliver.
• Harsh engagements or slipping shifts with P0748.
• A bang or flare on a 3-2 kickdown.
• Intermittent limp mode that only shows up hot.

Confirming it is the solenoids

Performance codes like P0751 and P0756 mean the gear ratio did not change as commanded, which can be a sticking solenoid, a worn valve bore or a slipping clutch. Measure each solenoid circuit at the case connector first, then decide. Our 4L60E shift solenoid testing guide covers the resistance checks, and if the complaint is converter shudder our TCC solenoid diagnosis guide explains how to separate a solenoid fault from valve body wear. Bore wear is common in this family, and a vacuum test of the valve body is the reliable way to tell. If the bores leak, new solenoids alone will not hold the shift.

Fitment

This set is for the 2003-up pattern of the GM 4L60E, 4L65E and 4L70E. The 1993-2002 units use a different EPC solenoid and TCC arrangement, so these parts are not a match there. Look at the numbers stamped on your old solenoids and compare them to 24230298, 24248893, 24227792 and 24212327 before ordering, or send us your year and VIN to check. You will find the rest of our parts for this transmission on the 4L60E collection page.

Install notes

• Drain and drop the pan, pull the filter and unplug the internal harness from each solenoid.
• Swap the solenoids one at a time so each new part goes into the bore the old one came from.
• Pre-lube every O-ring with ATF, and torque the valve body bolts in sequence if you pull the body.
• Inspect the harness while you are in there. GM bulletin PIP5009G directed technicians on certain 2012 models to replace the internal harness and TCC enable solenoid whenever transmission repairs are made, a sign of how often that wiring causes repeat trouble.
• Fit a new filter and pan gasket, refill with Dexron VI, check the level hot, clear codes and run the shift relearn.

If the pan is already down for shift-feel complaints, a 4L60E shift kit is a sensible companion, and a worn valve body can be replaced outright with our 4L60E valve body for 1998-2008.

Does this kit fit a 2002 or earlier 4L60E?

No. It is the 2003-up pattern. Earlier units use a different EPC solenoid and TCC arrangement. Check the part numbers on your old solenoids or send us your year and VIN.

Does it include the wiring harness or TCC enable solenoid?

No. The kit is five solenoids: two shift solenoids, the EPC, the TCC PWM and the 3-2 downshift solenoid. If your harness or TCC enable solenoid needs replacing, choose a kit that includes the harness.

Will this fix my torque converter shudder?

It can, if the TCC PWM solenoid is the cause. If shudder continues, the usual next suspects are valve body bore wear or the converter clutch itself, so diagnose before assuming.

Is it for the 4L65E and 4L70E too?

Yes. The listing covers 2003-up 4L60E, 4L65E and 4L70E units, which share these solenoid part numbers.

Do I need to relearn shifts after installing?

Yes. Clear the codes and perform the adaptive shift relearn with a scan tool so the computer starts fresh with the new solenoids.

• 4L60E Shift Solenoid Symptoms, Testing and Replacement
• 4L60E TCC Solenoid and Code P0740: Diagnosis and Replacement
• 4L60E EPC (Pressure Control) Solenoid: Function and Failure
• 4L60E 3-2 Downshift Solenoid and Code P0785: What It Really Means