Action Taken When the DTC Sets

WARNING: This page is about a different car, the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban 3500 HD, and 2018 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.

P2719

DTC P2719 is a Type C DTC.
The TCM freezes transmission adaptive functions.

P2720

DTC P2720 is a Type A DTC.
The TCM freezes transmission adaptive functions.
The TCM commands maximum line pressure.
The TCM inhibits TAP Up/Down function.
The TCM inhibits manual shifting of forward gears.
The TCM inhibits engine braking.
The TCM inhibits neutral idle.
The TCM inhibits auto grade braking.
The TCM inhibits Tow/Haul function.
The TCM commands neutral gear when the output speed sensor signal is 1, 350 RPM or greater.
The TCM commands second gear when the output speed sensor signal is less than 1, 350 RPM.

P2721

DTC P2721 is a Type A DTC.
The TCM freezes transmission adaptive functions.
The TCM commands maximum line pressure.
The TCM inhibits TAP Up/Down function.
The TCM inhibits manual shifting of forward gears.
The TCM inhibits engine braking.
The TCM inhibits neutral idle.
The TCM inhibits auto grade braking.
The TCM inhibits Tow/Haul function.
The TCM commands 3rd gear.