GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

Line pressure solenoid

Refer to Diagnostic System Check - Vehicle.

Transmission fluid level

Refer to Transmission Fluid Check.

Select linkage

Refer to Park/Neutral Position Switch Replacement.

Throttle angle

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

Low and reverse clutch

Burn or wear of the low and reverse clutch

Reverse clutch

Burn or wear of the reverse clutch. Refer to Reverse Clutch Disassemble.

Control valve spool

Control valve spool error