GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

Line pressure solenoid

Refer to Diagnostic System Check - Vehicle.

Lock-up solenoid

Refer to Diagnostic System Check - Vehicle.

Transmission fluid level

Refer to Transmission Fluid Check.

Line pressure out of range

    • Damage or wear to the oil pump gears
    • Operation of the control valve spool