Diagnostic Aids
WARNING: This page is about a different car, the 2002 GMC Cab & Chassis Sierra and 2002 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 shift speed specifications. See SHIFT SPEED SPECIFICATIONS under PERFORMANCE TESTS.
Other internal transmission failures can cause more than one shift to occur. See SHIFT SOLENOID VALVE STATE & GEAR RATIO table under DESCRIPTION & OPERATION.
DTC P0751 defaults to an elevated line pressure condition which may result in TCC partial apply. This may induce idle surge and engine stall.