Conditions For Running DTC

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

No Transmission Fluid Pressure (TFP) manual valve position switch DTC P1810.
The engine speed is greater than 450 RPM.
The time since the last gear range change is greater than 6 seconds.
The transmission output speed rise does not exceed 600 RPM within 2 seconds.