OEM 24225825 4L60E EPC Pressure Control Solenoid: Symptoms, Specs & Install

If you searched for 24225825, this is the part. 4L60E EPC Pressure Control Solenoid for the 4L60E. Below: what fails, what the symptoms look like, resistance specs to test before replacing, and the step-by-step install procedure.

What it does

Controls main line pressure. Critical for shift quality across all gears. Replace on every rebuild — the spring fatigues.

Fitment

1993-2008 GM trucks, SUVs, and cars with 4L60E or 4L65E.

Common failure symptoms

P1810, P1811, harsh shifts, slipping, intermittent line-pressure faults, soft shifts under load

Electrical specs

Run a resistance check before condemning the solenoid. Bad wiring, corroded harness pins, or a failing PCM driver can cause the same symptoms as a bad solenoid. Eliminate cheap causes first.

Replacement procedure

1. Drop pan and filter
2. EPC solenoid is on the rear of the valve body
3. Disconnect 2-pin harness clip
4. Remove 8mm retaining bolt
5. Pull straight out
6. Lubricate O-ring with fresh ATF
7. Torque to 8 ft-lbs
8. ALWAYS replace on a rebuild — it is the cheapest insurance against a comeback

Estimated time: 1 hour for someone who has done this before, 2-3 hours for first-timers. Tools needed: 8mm and 10mm sockets, snap-ring pliers (if removing the valve body), torque wrench, drain pan, fresh ATF.

Related diagnostics on Gearbox Insider

4L60E rebuild parts guide • Shop by transmission symptom • Solenoid testing without a factory scan tool