My DD has no power and has the following codes. It is stock with a stock tune.
Any Ideas from you LLY Gurus would be appreciated.
PO299
PO401
po404
Any Ideas from you LLY Gurus would be appreciated.
PO299
PO401
po404
LLY codes
- Thread starter 02freighttrain
- Start date
401 and 404 are EGR codes and the 0299 is Turbo underboost. What happened when the codes appeared.
It did not do anything wierd. The only noticable thing is it's down on power. When I clear the codes it will run normal for a few miles, then it throws the codes and go's back to the problems.
I had that same issue the other day. I think it was a bad tank tank of fuel for me. 
It run fine now no issues.
It run fine now no issues.
How dare you not put a tune on that truck!
Here's how to fix: Put a 50 hp tune on it and block the EGR, problem solved.
Here's how to fix: Put a 50 hp tune on it and block the EGR, problem solved.
Got it fixed..
Disabled the EGR and changed the underboost value limits.....Thanks Pat. and the other Team sald members that chimed in.
Disabled the EGR and changed the underboost value limits.....Thanks Pat. and the other Team sald members that chimed in.
wonder what caused the problem though
That's the trucks way of telling Steve "Give me more power now! and quit feeding me my own exhaust! YUK."