Diagnostic Aids
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 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 conditions with specific clutches, such as 1-2-3-4 clutch and 2-6 clutch for 2nd range.
- Incorrect ratio code could indicate a hydraulically failed solenoid. Observe DTC information for specific solenoid.
- Clutch test mode can be used to measure stall speed. Observe turbine speed signal. If the turbine speed signal does not return to zero or rises during the stall test, a leak or obstruction in a specific clutch apply circuit could be present.
- You may have to drive the vehicle in order to experience a condition.