Conditions for Running the DTC

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

DTC P1626 is not active.
The powertrain control module (PCM) is not in password learn mode.
The VTD Passlock system is enabled.
The fuel enable decision point has been reached, or the engine is cranking.