So I ran the trouble codes. Had six different codes. Odd thing is I have never seen a check engine light on in the truck ever.... maybe they were not codes that would set a light off? Kinda new to the 6.0L

I just got an edge CTS 2 last week and hooked it up to check the codes.

P0269- crank sensor not recieving an acceleration of the crank shaft from cylinder number 3.

P0299-throttle intake pressure less then desired throttle intake pressure.

P0403/P0405 which are EGR codes and I dont have one of those (probably why I have the code) haha

P0478- exhaust pressure not matching intake manifold pressure

P2290- insufficient oil pressure to control high pressure fuel injection.

in the past few days I have noticed that the truck when warm drives like a slug, hardly any power. Happens intermittently. Yesterday afternoon drove the truck for maybe two hours. after the truck had set for about an hour started it up and it was idling real rough. Rougher in drive or reverse then in park or Neutral but either way you could still feel the miss.

I have been reading different forms and posts all morning. I have seen similar symptoms caused by anything from a ICP sensor or IPR valve, to an injector, or injector related issue, to even the HPOP.... so with all the codes I have it leads me to think that I may have one or more of these issues. Looking for advice on steps to follow to maybe narrow it down verses just throwing parts and hoping for the best...

thanks in advance for any help or advice.
- Shawn.

 

You are going to need to post some numbers to sort this out. Right off the bat the codes might indicate there is more than one issue. The most troubling is the P2290. some of the other relating to intake and exhaust pressure could be something simple. So, the first thing I would do is clear the codes and then inspect the hose that feeds intake manifold pressure to the MPG sensor ( manifold pressure gage) which is mounted on the ac evaporator case, this sensor is a black plastic part with a hose going to the intake manifold on the passenger side. Check the hose carefully for leaks it can get cracked. and put a probe in the intake manifold nipple to be sure it is not clogged.Go for a test drive see if that helps and see if some of the codes (P0299 & P0478) are still setting.
You will need to measure some things to address the other codes. You will have to monitor EOT, ICPv , ICP psi, IPR % dc. First do a KOEO looking at those three. V should be about 0.2, ICP psi, 0-15 psi, IPR ~15%. Post those numbers., That will be the first step in diagnosing the P2290. Just so you know in the worst case scenario the part to throw at that could be 4K -6K range. So it is best to narrow thing down. It could be just the ICP sensor or off spec IPR valve or if the pump is failing 4-5K, or a high pressure oil leak which isn't as bad, money-wise as the pump.
If the P0299 and P0478 were not caused by the hose or plug then post some numbers relating to this, for starters, post KOEO: MAP psi,BARO, psi, EBP , EOT deg f.
Post these and see where this will go.
Some of the monitors like STC ( I believe) don't come out of the box set up to test a wide range of PID's. If that turns into a hassle, you may want to download ForScan Lite on your cell phone free or about $5 and buy blue tooth OBD adapter about 30 bucks. The adapter that works is BAFX OBDII, usually avaible on Amazon.
Monoitoring the KOEO for ICP,IPR, and the other preeure related is just the first step, then no doubt you will be asked to do some KOER tests. Or it you are lucky, maybe not.
Throwing parts for these codes would be a really bad idea.IMHO

 

Thank you man for all that info, I am at work today. Currently working a 24hr shift. So when I get home tomorrow morning I will be sure to post all the numbers you suggested. I'll have to look over my CTS 2 I believe it will monitor all of those PID's but I will double check tomorrow in the morning when I get home.

 

Definitely a good idea to clear out old codes and see what new ones popup
P0478 could be a plugged CAT or bad EBP sensor
need to clear out the old and see the new

 

Alright so this morning I got some data.

KOEO:
(ICP V- 0.2) (ICP PSI- 0) (IPR%-14)

(EOT- 57°) (MAP PSI-14) (BARO PSI-14.2) (EBP- 0)

Now since the key had been in the on position for so long I knew it would crank a while before starting so I ran some numbers while cranking.

Engine Cranking:

(FICM V-48.5) (ICP V-1.7) (ICP PSI-1500)(IPR%-49%)

Engine Running:

(ICP V-1.5)(ICP PSI-1200)(IPR%-43%)

that is all I have for now. If there is anything further I need please let me know. thank you for all the help.

 

What did MAP and EBP do when the engine was running?

P0478 is typically either a stuck turbo or a bad EBP sensor. P0299 similarly indicates a stuck turbo, bad VGT actuator, leaks in the intake or exhaust, or something with the pressure sensors.

 

This is engine running but not at operating temp

 

This is after the truck has been idleing for about 20 minutes.

 

EBP looks ok, but can you get the MAP sensor to increase?

Also, it would be good to see FICM VPower and LPower

 

So far the P2290, low high pressure code, does not look like it should reset, at least at idle. You could drop ECT and FICM for now and add RPM and VGT %dc. Clear the codes and go for a drive, under full throttle the ICP should shoot up to at least 3500 psi +/- . You don't need to be going fast, just WOT for a few seconds. If you are at 2500-3000 RPM with WOT , the MAP should be 14+20 or about 34 psi, the EBP should be 40+ or something in that range.
There this the #3 cylinder code to worry about, but could be the cause of these other codes or the other codes are contribitoing to the it. So if there is nothing grossly wrong with the HP pressure and MAP and EBP then the cylinder accel code needs attention. It could but an injector, a dropped valve, broken rocker, broke piston ECT If it is injector related the the pressure numbers you are to get could be more or less normal or at lest not grossly off.

 

I see Mark is on this so, let him guide you, he a lot more knowledgeable than me, Good luck let's hope the cause of this is not engine damage.

 

Don't back out!! Your advice has been more thorough than mine has been!

 

WOT

Not WOT but truck seemed pretty slugish when pic was taken.

After i got home from my test drive only code to come back minus the EGR codes was the P2290.


I will say the loss of power is fairly intermittent, and I have only had the rough idle once.

I have noticed that my turbo seems to bark all to often. (Intermittently) sometimes i notice if after i let off with barely any throttle and then some times i drive it and dont hear it at all unless under a significant load pulling a hill.

i have factory exhaust as well.


Also noticed this on my garage floor after letting the truck idle in there for a few minutes. Never seen it do that like that before.

 

Im not sure what you mean be FICM V power and L power. Only thing the edge shows me is Ficm voltage which is 48.5 and the ficm sync which said 1.

 

If its significant engine damage im screwed... but I guess it just is what it is. But please dont stop with the advice I appreciate everyone's advice. I'm pretty green when it comes to these trucks. Had a duramax for 7 years and learned quiet a bit about the . But I just couldnt keep my eyes off this truck so I bought it. Been very happy with it so far!