Conditions for Setting the DTC
WARNING: This page is about a different car, the 2017 GMC Yukon XL, 2017 GMC Yukon, 2017 Chevrolet Tahoe, 2017 Chevrolet Suburban 3500 HD, and 2017 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
P0872
The Transmission Control Module detects that the Transmission Fluid Pressure Switch 3 signal voltage remains LOW after the 2-6 clutch transitions from a HIGH pressure state to a LOW pressure state. The Transmission Control Module counts each incident. The DTC sets when 10 counts are accumulated.
P0873
The Transmission Control Module detects that the Transmission Fluid Pressure Switch 3 signal voltage remains HIGH after the 2-6 clutch transitions from a LOW pressure state to a HIGH pressure state. The Transmission Control Module counts each incident. The DTC sets when 15 counts are accumulated.