Conditions for Running the DTC

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

DTC P2670 and P2671 are not active.
The components are powered and ignition voltage is greater than 9.0 volts and less than 18 volts.
Engine speed is greater than 200 RPM and less than 7,500 RPM for 5 seconds.
TCM initialization is in process.
Engine crank time is not extended.