Conditions for Running the DTC

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

No transmission serial data DTC U0100.
No vehicle speed DTC P0722 or P0723.
No engine torque DTC P0101, P0102, P0103, P0106, P0107, or P0108.
No throttle position DTC P0120-P0123, P0220, P0222, P0223, or P2135.
The ignition voltage is 9-18 volts.
The transmission gear selector serial data message has been received and is valid.
The engine speed is greater than 400 RPM.