Action Taken When the DTC Sets

WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.

P0601, P0603, P0604, or P062F

DTCs P0601, P0603, P0604, and P062F are Type A DTCs.
TCM limits the transmission to Reverse and 5th gear operation.
TCM commands maximum line pressure.
TCM forces the torque converter clutch (TCC) OFF.
TCM freezes transmission adaptive functions.
TCM commands the high side driver OFF.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.

P0602

DTC P0602 is a Type C DTC.
TCM limits the transmission to Reverse and 5th gear operation.
TCM commands maximum line pressure.
TCM forces the torque converter clutch (TCC) OFF.
TCM freezes transmission adaptive functions.
TCM commands the high side driver OFF.
TCM inhibits Tap Up/Down function.
TCM inhibits manual shifting of forward gears.