P0401 engine code - Chevy and GMC Duramax Diesel Forum
07.5-2010 LMM Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 12-05-2011, 03:28 PM   eBay Motors  #1 (permalink)
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P0401 engine code

Hey got a quick question if anyone has an answer. I was recently driving my truck and the check engine light came on. Buddy of mine has a scanner so I scanned it and the P0401 code came up for low exhause gas flow. I brought it to the dealer ship and they said they need to do an injector clean for 300 bucks and load a new program in to the computer for another 400 dollars also regenerate the DPF. Does any of this sound strange to anyone else. I dont understand why all this has to happen. The truck never started running poorly and the check engine light went off in about 15 minutes. Any suggestions would be welcome. Thanks
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Old 12-05-2011, 03:38 PM   eBay Motors  #2 (permalink)
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That's an EGR code for low flow....which doesn't hurt anything.
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Old 12-05-2011, 05:05 PM   eBay Motors  #3 (permalink)
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Should I be concerned also the guy at the dealship told me i should have my injectors cleaned every 30k miles to the tune of 300 bucks per cleaning. I run an additive in every tank and I always have.
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Old 12-05-2011, 05:09 PM   eBay Motors  #4 (permalink)
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I'd say that dealer was low on their quota and needed to make some money. You do not have to have your injectors cleaned every 30k, some of the bs people come up with is amazing. Your doing a good thing running additive, not much more you can do. Other than be picky where you get your fuel from
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Old 12-05-2011, 05:16 PM   eBay Motors  #5 (permalink)
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^ I agree.. the dealer is trying to take advantage of you.

Personally id get a tuner and exhaust to remove the dpf, block the EGR off and then never worry about it again
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Old 12-05-2011, 06:14 PM   eBay Motors  #6 (permalink)
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If the light turned off on its own then apparently what ever happened has corrected itself.
Have your buddy scan it again and check for codes.

If your using a additive every tankful then you should be ok, one thing you could check if you know someone with the proper equipment is the "Fuel injector balance rates". This would tell you if your having injector issues.
I had mine checked last week,@55K and all was good, I use Diesel Kleen and Lucas every tankful. I would have to think your dealer is hungry for business.

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This appears to be pretty nice and almost comparable to the Tech II for monitoring Fuel Injector Balance Rates in real time, with your own PC or Laptop.
I searched for several days and this was the best price that I have found for something like this around $ 250.00 for everything except the PC/Laptop and vehicle to test.
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Old 12-05-2011, 06:27 PM   eBay Motors  #7 (permalink)
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Quote:
Originally Posted by Jddriver6 View Post
the guy at the dealship told me i should have my injectors cleaned every 30k miles to the tune of 300 bucks per cleaning. I run an additive in every tank and I always have.
Did they happen to reveal/show you what the balance rates were that would necessitate the cleaning? Or did they just randomly throw out that 30k mile figure?
If youre regularly running an additive, Id doubt you have issues on an LMM.
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Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
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Old 12-05-2011, 06:53 PM   eBay Motors  #8 (permalink)
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If the truck it totally stock, and no mods have been done to it, then it sounds like the EGR valve or the EGR cooler is plugged. To clean the valve, take the intake tube and the EGR valve off and clean the heck out of the valve. If the valve is not too bad, then the EGR cooler is plugged. Take the EGR cooler off and soak it in a 100% solution of Simple Green for 24 hours. That should take care of it. If you were a northern truck, I would almost guarantee this is your problem. Being a southern truck, you will have to dig around. If you spend a lot of time idling, then this is likely your problem. I would also look around for another opinion and try to find a dealer that has a real diesel tech working there.
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Last edited by lugnut; 12-05-2011 at 07:00 PM.
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