P1446 is a vent control valve code. The valve that attaches to the vaor cannister under the truck. There is a bulletin for this that includes repalcing the valve and installing a filter kit.
P1615 is a Nats malfunction code. could be voltage, unprogramed key, remote start issue, etc etc etc.....
P1615 is a Nats malfunction code. could be voltage, unprogramed key, remote start issue, etc etc etc.....