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Diagnostic Aids

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Incorrect ratio codes typically indicate mechanical problems 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.

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