Diagnostic Aids
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Incorrect TCM calibration will cause this DTC to set.
Incorrect ratio codes typically indicate mechanical conditions with specific clutches.
Incorrect ratio code could indicate hydraulically failed solenoid. Check DTC information for specific solenoid.
Drive the vehicle if necessary to experience fault. Clutch test mode can be used to check stall speed.