Code Enable Criteria

WARNING: This page is about a different car, the 2001 GMC Savana, 2001 Chevrolet RV Cutaway, 2001 Chevrolet Cutaway, and 2001 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

Engine speed is more than 450 RPM.
Engine is not in fuel cutoff.
Time since last gear range change is more than 6 seconds.
Transmission output speed rise does not exceed 600 RPM within 2 seconds.
No Transmission Fluid Pressure (TFP) manual valve position switch DTC P1810.

DTC sets when transmission output speed drop is more than 1300 RPM for 3 seconds when transmission is not in Park or Neutral. Transmission output speed drop is greater than 8129 RPM for 409 seconds when transmission is in Park or Neutral.