GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

DEFINITION: High Line Pressure

Actuator Feed Limit Valve

Stuck open

Calibrations

Not updated or incorrect platform

Checkballs

Missing

Final Drive Internal Gear Snap Ring

Missing

PCS Feed Valve

Stuck

Pressure Control Solenoid (PCS)

    • Failed OFF, intermittent short
    • Loose connector

Pressure Reg. Boost Valve

Stuck open

Pressure Reg. Valve

Stuck at high torque signal due to undersized bore, sediment or Pressure Control Solenoid failure

Transmission Wiring Harness

Loose connection at vehicle harness