Action Taken When the DTC Sets

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.

P2728

DTC P2728 is a Type C DTC.
The TCM freezes transmission adaptive functions.

P2729

DTC P2729 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 engine braking.
The TCM inhibits neutral idle.
The TCM cancels Tow/Haul mode function.
The TCM inhibits auto grade braking.
The TCM commands neutral gear if output speed sensor signal is 1, 350 RPM or greater.
The TCM commands 2nd gear if output speed sensor signal is less than 1, 350 RPM.

P2730

DTC P2730 is a Type A DTC.
The TCM forces TCC OFF.
The TCM commands maximum line pressure.
The TCM inhibits TAP Up/Down function.
The TCM turns OFF the high side driver.
The TCM inhibits engine braking.
The ECM commands a reduction in engine torque based on input form the speed sensor.
The TCM inhibits neutral idle.
The TCM inhibits manual shifting.
The TCM inhibits auto grade braking.
The TCM inhibits Tow/Haul function.