8L90 Reference

OEM 24262026 GM 8L90 EPC Pressure Control Solenoid: Symptoms, Specs & Install

Name: GM 8L90 EPC Pressure Control Solenoid (OE# 24262026)
SKU: 24262026
Availability: InStock

If you searched for 24262026, this is the part. GM 8L90 EPC Pressure Control Solenoid for the 8L90. Below: failure symptoms, electrical specs, install procedure.

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What it does

Main line pressure regulator for the 8L90. Critical wear item — replace at every rebuild.

Fitment

2014-present GM Silverado 1500, Sierra 1500, Tahoe, Yukon, Suburban, Escalade with 8L90 eight-speed.

Common failure symptoms

P0796, P0962, harsh shifts, line-pressure fault, transmission slipping at highway speed under load

Electrical / install specs

Variable bleed solenoid.
PWM controlled by TCM.
Resistance 3-5 ohms.

Run a resistance check before condemning. Bad wiring, corroded harness pins, or a failing PCM driver can cause identical symptoms.

Replacement procedure

Drop pan and filter
Remove valve body
EPC solenoid sits at front of valve body
Disconnect harness pin
Remove retaining bracket
Lubricate O-rings with Dexron HP
Torque to 89 in-lbs
8L90 uses Dexron HP — NOT Dexron VI. Wrong fluid causes shudder.

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