Faulty Cooling Fan Relay
Faulty Cooling Fan
Cooling Fan harness is open or shorted
Cooling Fan circuit poor electrical connection
Engine Light ON (or Service Engine Soon Warning Light)
Cooling Fan Control Circuit is the generic description for the P1660 Buick code, but the manufacturer may have a different description for your model and year vehicle. Currently, we have no further information
about the P1660 Buick OBDII code.