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.
DTC may set if a forward or reverse gear range is selected immediately after the engine is started and before the TCM detects pressure at the switches (2 to 6 seconds after engine start).
A plugged control main filter may cause this DTC to set. The control main filter is to be changed after the first 5000 miles. Failure to change the filter at this interval may cause this DTC and other pressure switch DTCs to set.