I went to the codes section but these are not listed over there 0628 0529 0541 0483 I was just told that all this # start with a P so I guess they are pcm codes

I went to the codes section but these are not listed over there 0628 0529 0541 0483 I was just told that all this # start with a P so I guess they are pcm codes

0628 - low voltage detected at the fuel lift pump 0529 - ? 0541 - low voltage on the no. 1 intake air heater relay 0483 - Fan speed

On the 0529 could that be the 0629 - High voltage detected at lift pump.0628 - Low voltage detected at lift pump.These codes might be in relation to each other.

Problem is that OBDII standard where suppose to be generic from 0000-0999 then model specific from 1000-9999. But it didn't quite work that way. So without knowing a lot about the truck or vehicle the codes are coming from make it hard for me to look up. Basically did a search on my site for the codes and they popped up in the 3rd Gen (assuming this is the vehicle)

Sorry about all that, my friend called and said he had a customer broke down outside his gate and was just trying to get him going. We didnt know much until now, it is a 02 dully 5 speed but anyway I think they did something with it.

Really odd... The error codes you provided are of 3rd Gen code list more so than 2nd Gen...