GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

Shift solenoid A

Refer to DTC 53 .

Shift solenoid B

Refer to DTC 58 .

Shift switch

Refer to DTC 55 .

Transmission fluid level

Refer to Transmission Fluid Check .

Select linkage

Refer to Park/Neutral Position Switch Replacement .

Transmission control module (TCM)

Refer to Diagnostic System Check - Automatic Transmission .

Low clutch

Burn or wear of the low clutch-- Refer to Low Clutch Disassemble .

Low and reverse clutch

Burn or wear of the low and reverse clutch

Control valve spool

Control valve spool error