Conditions for Running the DTC

WARNING: This page is about a different car, the 2009 GMC Yukon and 2009 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.

P150A

The TCM indicates the transmission output speed signal is valid.
Transmission output speed is 1,200 RPM or greater.

P150B

Transmission output speed is greater than 300 RPM for 2 seconds.
Transmission output speed has changed less then 500 RPM for 2 seconds.