Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Engine Light ON (or Service Engine Soon Warning Light)
Serial Communication Problem With Device 6 is the generic description for the P1606 Buick code, but the manufacturer may have a different description for your model and year vehicle. Currently, we have no further information
about the P1606 Buick OBDII code.