Diagnostic Codes

[Got Diesel]

What are these can't find them in the Wiki.

P0541
P0640

I am reading these using my Evolution. It says the are Air intake Heater, or something like that for both of them. Help. By the way this is the first time that I have gotten these, and tonight I installed my 4 position Wildman Chip if that helps. Thanks.

 

[95_stroker]

P0541 Intake Air Heater "A" Circuit Low
P0640 Intake Air Heater Control Circuit

 

[Got Diesel]

What do those mean? Why would they just show up now after the chip install. Before I have always had the same three or four codes. How do I fix them?

 

[Tail_Gunner]

The chip you installed likely has a tune that is based on a 99.5 program. The 99.5 trucks have an air intake heater where as the early 99's do not.

Basically it's saying the AIH is not working, but that's because it ain't there. Don't worry about it, mine does the same thing.