Conditions for Running the DTC

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

DTCs P0005, P0192, P0193, P0336, P1207, P1432, P1433, or P2665 are not set.
The compressed natural gas (CNG) fuel tank pressure (FTP) is more than 1 723 kPa (250 psi).
The engine coolant temperature (ECT) is more than 20° C (68° F).
The engine speed is more than 100 RPM.
The mass air flow (MAF) is less than 200 g/s.