GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

ATF temperature sensor

Refer to DTC 17 .

Line pressure solenoid

Refer to DTC 48 .

Throttle position sensor

Refer to DTC 54 .

Throttle angle

Throttle angle out of adjustment. Refer to Symptoms - Engine Controls .

Transmission control module (TCM)

Refer to Diagnostic System Check - Automatic Transmission .

High clutch

Burn or wear of the high clutch. Refer to High Clutch Disassemble .

Servo release accumulator

Malfunction of accumulator

Broken or damage oil pump

Seized or broken pump gears

Control valve spool

Control valve spool error

Control valve

Missing steel ball in control valve

A/C signal circuit to TCM

Harsh shift with open A/C signal circuit when A/C is requested ON