Action Taken When the DTC Sets

WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

P0842

DTC P0842 is a Type B DTC.
The TCM commands maximum line pressure.
The TCM commands the TCC ON at maximum capacity.
The TCM freezes transmission adaptive functions.
The TCM inhibits 4th gear if the transmission is in Hot Mode.

P0843

DTC P0843 is a Type B DTC.
The TCM forces the TCC OFF.
The TCM inhibits TCC engagement.
The TCM freezes transmission adaptive functions.
The TCM inhibits 4th gear if the transmission is in Hot Mode.