Conditions for Running the DTC

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

No 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 time since the last 4WD/AWD low state change is greater than 6 seconds.
The transmission output speed rise does not exceed 600 RPM within 2 seconds.