Diagnostic Aids

WARNING: This page is about a different car, the 2003 GMC Yukon XL, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. 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, See Shift Speed .
Other internal transmission failures may cause incorrect gear ratios to occur. Refer to Shift Solenoid Valve State and Gear Ratio, See Shift Solenoid Valve State And Gear Ratio .
DTC P0751 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.