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.

Verify that the transmission meets the specifications in the Shift Speed table. Refer to Shift Speed .
Other internal transmission failures may cause incorrect gear ratios to occur in 3rd gear.
The customer may have concern of an engine over-rev condition or neutral condition in 4th gear. Refer to Shift Solenoid Valve State And Gear Ratio .
DTC P0757 defaults to an elevated line pressure condition which may result in partial TCC apply. This may produce an idle surge that could stall the engine.