new diesel owner

lupo1904

New member
Mar 10, 2014
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So i have wanted one for years and finally found the right deal, i bought a 2007 gmc duramax with 64,000 miles and the truck is in show room condition. I have owned it for 2 weeks and it seems to run really good but my engine light came on and the codes are p003a and p2563. I have read about the codes but everyone seems to say different stuff. The truck is stock and has never had a tuner hooked up to it. Lets hear what some of you have to say.
 

Hot COCOAL

May the farce be with you
Jun 9, 2012
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So, what were the results of your research? What did the codes mean? I know, but I want to hear what you think..
 

Hot COCOAL

May the farce be with you
Jun 9, 2012
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Well, since there hasn't been a response I guess for good fodder, I'll spill the beans, but for future reference telling us "I searched" and not providing the info found during your search seems like your fishing for answers without searching:D

Clean or replace the vane position sensor:thumb:

Both codes you are getting are due to that sensor failing in some way or another...
 

lupo1904

New member
Mar 10, 2014
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Forgive me for not answering back to a reply at 11:00am i have to work for a living. The info i read had said the vanes in the turbo could be stuck or not opening all the way. I also read that vane position sensor is failing or is not working properly. Some people are saying they have symphtoms and me being new i cant pin point them cause the engine light has been on since i bought the truck. Others that are throwing the same codes say they have loss of power until engine temp reads 170. I idle my truck in the morning for 10 mins to warm up. It reads 100 when i leave. If i drive it hard sometimes the light turns off but will turn back on. I just pulled the sensor and the plunger seems to depress just fine. There was a little black stuff on it but i cleaned it with brake cleaner and sprayed WD in the electical side. Are the turbo vanes suppose to open and close during a cold start idle? In my exhaust i can hear it hiss then stop, but only once inawhile. Dont beat me up to bad, im new.
 

Harbin_22

Active member
Dec 4, 2010
3,858
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Southern Indiana
It really is hard to tell which it is, could be sensor or vanes. Most people try the sensor first just for ease of replacement. If that doesn't do it then it is time to pull the turbo. I think EGR is the culprit to stuck vanes IMO.
 

Harbin_22

Active member
Dec 4, 2010
3,858
7
38
Southern Indiana
Well, since there hasn't been a response I guess for good fodder, I'll spill the beans, but for future reference telling us "I searched" and not providing the info found during your search seems like your fishing for answers without searching:D

Clean or replace the vane position sensor:thumb:

Both codes you are getting are due to that sensor failing in some way or another...


Chill out CoCo. There really isn't a definitive answer to the codes.
 

lupo1904

New member
Mar 10, 2014
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Chill out CoCo. There really isn't a definitive answer to the codes.

Thats what it sounds like to me, to many different symptoms and to many could be's. Ill drive around and see iff it comes on again. I also tested the volts to that sensor and seems to check out at 4.9 volts which i read is correct.
 

Harbin_22

Active member
Dec 4, 2010
3,858
7
38
Southern Indiana
The vanes can stick for just a couple seconds and set the code. If the truck isn't running bad or sluggish and is getting decent mileage, it isn't going to hurt to run it that way.
 

lupo1904

New member
Mar 10, 2014
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The vanes can stick for just a couple seconds and set the code. If the truck isn't running bad or sluggish and is getting decent mileage, it isn't going to hurt to run it that way.

Is 11.2 in town decent milage for a stock dmax? I put a 4" mbrp down pipe on and thats it. Gunna put a muffler on cause it to load and i dont really like the jet airplane sound.
 

TexasRob

New member
Dec 19, 2012
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Canyon Lake Texas
Is 11.2 in town decent milage for a stock dmax? I put a 4" mbrp down pipe on and thats it. Gunna put a muffler on cause it to load and i dont really like the jet airplane sound.

11 isn't bad for town driving that is about what I get. Don't trust the truck to be accurate on the MPG's though. They have been known to be less than trustworthy. Manually calculating is the most accurate way.
 

Hot COCOAL

May the farce be with you
Jun 9, 2012
4,433
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0
Chill out CoCo. There really isn't a definitive answer to the codes.
Ouch, ok, I was trying to save the guy from future grief, as more often than not, you'll see "do a search" or "read more" as an answer when questions are proposed like that:hug:

I ended in a :D for goodness sake
:rolleyes:

lupo1094; said:
Forgive me for not answering back to a reply at 11:00am i have to work for a living.
Dbl. ouch, I'm sorry I missed your window, you were still logged in when I replied, which was only 29min after your last post...:angel:

lupo1094; said:
The info i read had said the vanes in the turbo could be stuck or not opening all the way. I also read that vane position sensor is failing or is not working properly. Some people are saying they have symphtoms and me being new i cant pin point them cause the engine light has been on since i bought the truck. Others that are throwing the same codes say they have loss of power until engine temp reads 170. I idle my truck in the morning for 10 mins to warm up. It reads 100 when i leave. If i drive it hard sometimes the light turns off but will turn back on. I just pulled the sensor and the plunger seems to depress just fine. There was a little black stuff on it but i cleaned it with brake cleaner and sprayed WD in the electical side. Are the turbo vanes suppose to open and close during a cold start idle? In my exhaust i can hear it hiss then stop, but only once inawhile. Dont beat me up to bad, im new.

Sometimes they don't open because of the sensor, codes can be tough, they don't always pin point the issue, sometimes because the vanes are all sooted up and sticking, others cuz the vanes themselves fail, typically it's the first two, iirc there is a way to test the solenoid, I don't know how tho:eek:

Hmm, if driving it hard causes the light to go off, I almost wonder if the vanes are sooted up and sticking...just may be time to pull the turbo and inspect them, delete the egr or block it and see how that treats ya...;)

Good luck :hug:
 

lupo1904

New member
Mar 10, 2014
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If i block off the egr wont it throw a bunch of codes? Would i need to get a tuner?
 

lupo1904

New member
Mar 10, 2014
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I have not researched this but a buddy says inorder to get my turbo out, if thats the case i have to pull the cab off the truck. Looking down on the turbo that doesnt seem true. Can someone answer that for me.