Test Description

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.

The numbers below refer to the step numbers on the diagnostic table.

3. This step tests the indicated range signal to the actual selected range. A faulty TFP manual valve position switch could set DTC P1810.
4. This step tests for proper ratios in each commanded gear state.

Fig 1: DTC P0730 (Steps 1 - 7)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC P0730 (Steps 8 - 9)

Courtesy of GENERAL MOTORS CORP.