Conditions for Running the DTC

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. 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 is running for greater than 7 seconds.
The system voltage is between 8-18 volts.
No TFP manual valve position switch changes for greater than 6 seconds.
No 4WD low switch change within 2 seconds.
No AT OSS increase greater than 250 RPM within 2 seconds.