DTC U1152: CCP Loss Of A/C-Heater Programmer Serial Data Communications: Notes
WARNING: This page is about a different car, the 1998 Cadillac Eldorado and 1998 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
DTC U1152 will set if ignition switch is in ON position and CCP has lost data communication with A/C-heater programmer. Diagnosis of this code is dependent upon other system symptoms (DTCs) present with DTC U1152.