Russtoy
Junior Member
Hi, guys, I'm having an issue with engine codes, caused by the grid heater. First, the heater bolt is tight. Changed the relay, still getting codes. Pulled the wires from relay. Cleared codes. Drive truck 20 minutes, get a code. p0542, p0381. Both are voltage to high. How can that be with trigger wires on relay disconnected. I have not disconnected the main power to the grid heater. That's next. Thanks. I seem to get the weirdest issues.lol