Chevy and GMC Duramax Diesel Forum banner

p0403

  1. General Discussion
    Engine light kicked on the other day and I hooked up a scanner to it this morning. Turns out it's the P0403 code - which, when I look around on this site, and others, has been discussed ad naseum already. So, apologies in advance, but I'm a newb to all this... My truck is a 2007 with about...
Top