Conditions for Running the DTC

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.

No VSS P0502 or P0503 DTCs.
No DTC P0730.
No TPS P0121, P0122, or P0123 DTCs.
The engine is running greater than 60 seconds.
The commanded gear is 3rd or 4th.
The system voltage is 6-18 volts.
PTO mode is not active.