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Duramax 6600 Discussion Forum for the Duramax 6600 Diesel Engine, including the LB7, LLY, LBZ & LMM engine specific topics.

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  #1  
Old 04-03-2008, 10:58 AM
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Default Check engine code.. PO234

I have towed in all three settings, about 5000-5500 pounds with a three stage Super Chip.. On both higher settings I have tripped my engine light.. Code number PO234.. Looked it up at all data, excessive boost.. According to the article, that code will only trip if the turbo exceeds 35 lbs of boost.. I was under the impression that the Dmax turbo wont excess 25 lbs... ??? I have had the light 3 times out of 6 trips.. On each occasion, it felt like the truck reverted to stock settings until I cleared the code... Have never had a code while daily driving.. Even on the higher setting...

Any input on the code would be appreciated.. Is the "excessive boost" gonna cost me bucks????

Thanks in advance for all your help guys
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Old 04-03-2008, 11:51 AM
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Let me guess: 2001 model?
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  #3  
Old 04-03-2008, 02:05 PM
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Quote:
Originally Posted by Kennedy View Post
Let me guess: 2001 model?
2002 2500 HD Silverado.. Just turned 100K... Well, in a couple days it will...

You make it sound like a common code???
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Old 04-05-2008, 01:30 PM
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Nate, I have an 01' and it was doing the same thing. Try searching "overboost" and you might find that thread. I installed an airaid intake and suddenly was getting an overboost code while attacking hills pulling my 30' 5'er. Never happend except when under big load. Took it to the dealer and asked for an ECM update to the 2002. (reccommended by some on this site) Of course they(dealer) said there is no way to do that. Not sure what they did but it has never happend again. Talk to John Kennedy on here he has the knowledge and the tuning capabilty to take care of it and you could get rid of the super chip. Make sure your filter is clean and the MAF is clean and oil free. Not positive what the max boost pressure is for the 02'.
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  #5  
Old 01-28-2009, 02:58 PM
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I thought I could revive this thread.. I didnt have any problems for the longest time.. Then four times towing, got the code each time.. PO234.. Didnt change the way the truck ran or anything and the code light shut it self off after the next start up.. This is driving me nuts, my buddys scan tool doesnt show any other codes tripped, only the PO234..

So, since it shuts itself off after the next start up, is this something I can ignore or what?
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Old 01-28-2009, 03:58 PM
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You are getting this on a 2002 model because of your freeflowing intake and exhaust, allowing higher boost pressures.

Run it on a lower setting, or live with the code. Just because you aren't limping, don't think you aren't putting extra stress on your torque converter and tranny clutches, you are.

Why tow under high power settings? Its asking for a big fat repair bill down the road. Head gasket repair is the most likely outcome of overboost. 2002 LB7 should be limited to +40hp when towing, in my experience.

Good luck!
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Last edited by Mark Rinker; 01-28-2009 at 05:17 PM.
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Old 01-30-2009, 01:45 PM
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Thanks for the input Mark.. It tripped the code on the lowest setting which I think is 25 hp and 75 ft lbs.. Ill tow it stock and see if it pops the code again.. It does concern me that its doing it tho, just trying to figure a remedy
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