Duramax LML Sticking EGR Valve Causing Reductant Fluid Quality Warning 

That’s a nice find. Damn Diesels can be head scratchers.

Hi wondering if you could help me with some information on how to sort out my problem and what the procedure is. I have regularly getting to codes coming up PO234 and POO3a I can delete the codes but reappears arfter driving for a while. Regards Brent

Can I just replace my egr valve? Or does it need to be recalibrated with that one of those expensive scanners?

I have a2007 chevy diesel With this code PO402 What is it ??