Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
Hi There, I'm Clayso a certified master automobile technician with 30 years of automotive repair and diagnostic experience.
I wouldn't go as far as saying the grill shutters are not important. The active grille air shutter actuator closes louvers at the front bumper to enhance vehicle aerodynamics in driving situations where cooling and A/C loads are relatively low and high levels of front end airflow are not required. If high levels of airflow are required the active grille air shutter actuator opens the louvers. The control signal from the fuel pump control module, ignition and ground circuits enable the active grille air shutter actuator to operate. If the conditions for opening the louvers are reached the fuel pump control module commands the active grille air shutter actuator to open the louvers. Cadillac has 2 service repair bulletins for this DTC P059f. Basically make sure there is no debris an or obstructions in the front grill louvers and that none of the flaps are overlapping and stuck.
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If the unit is bypassed you will still have a check engine light unless these parameters in the vehicles computer can be reprogrammed.
Dealer level software is required for any programming.