GM Service Manual Online
For 1990-2009 cars only

High Line Pressure

Checks

Cause

Pressure Regulator Valve (231)

Valve is stuck at high torque signal due to an undersized bore or sediment

Reverse Boost Valve (228)

Valve is stuck at high torque signal due to an undersized bore or sediment

Retainer Pin (211)

Pin is broken

Orificed Plug (210)

Plug is blocked

Pressure Control Solenoid Valve (320)

    • Valve has failed Off
    • Loose connector

PCM

Loose connector

Check the PCM for current DTCs