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09-28-2008, 04:52 PM
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#1 (permalink) |
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Diesel Fanatic
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P0401 & P0404 Code
My truck through these codes for the first time today. Hauled my drag car last night and when I started up the truck this morning it ran real rough. No engine light came on but I checked it with my predator and it gave me these codes. What is the best way to fix this. It seems to have cleared up for now.
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Mike 2005 GMC 2500HD LLY/CC/SB/SLE/4x4/SILVER BIRCH METALLIC/NERF BARS/285-60-17 Toyo Proxy STII/17X8.5 WELD RACING EVO VELOCITI 8's/BILSTEIN SHOCKS/DIABLO PREDATOR/EDGE JUICE WITH ATTITUDE/MBRP CATBACK EXHAUST/ Belltech 3" Dropped Shackles and Torsion Bars turned down. |
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09-28-2008, 05:00 PM
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#2 (permalink) |
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Diesel Specialist
Join Date: May 2006
Location: Grand Rapids, MI
Posts: 970
iTrader Score: 0 reviews
Michigan Oil Burners Member |
The P0401 is - Exhaust Gas Recirculation (EGR) Flow Insufficient
The P0404 is- Exhaust Gas Recirculation (EGR) Open Position Performance Here is the DTC Lookup tool- http://www.dieselplace.com/forum/dtc.php (it's located in the LB7 Forum in a sticky. I think they should put it in every engine section). Do you have your EGR Blocked or unplugged?
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2005 Duramax ECSB, T-bars cranked up, 2" block in the rear, Bilstein 5100 shocks, all on headlight mod, Diablo Predator set on 85hp, Silverline 4'' stainless turbo back with 5'' tip, Tint, 33x12.50R17 Mickey Thompson MTZ mounted on MKW-27 17x9 wheels..few other thingsLast edited by MAX Attitude; 09-28-2008 at 05:01 PM. |
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09-28-2008, 05:01 PM
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#3 (permalink) |
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Diesel Specialist
Join Date: Aug 2008
Location: Gainesville,Florida
Posts: 901
iTrader Score: 2 reviews
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I just clear them, I have a st8t piped exhaust and my egr is blocked. It usually only happens when i turn the HP up.
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2004.5 LLY,2500,CC,SB 4X4 LS,BLACK, Getting Ready for the teardown! Full Built Motor Big Twins Dual Fueler etc,etc,etc.:help |
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09-28-2008, 10:35 PM
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#4 (permalink) |
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Diesel Tuner
 
Join Date: Apr 2008
Location: Marengo, Illinois
Posts: 2,526
iTrader Score: 1 reviews
Illinois Diesel Power (IDP) Member Midwest Smokers Member |
Get a blocker plate and fingerstick from Kennedy Diesel. That will stop those codes from coming up.
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Dan Clarke 2005 Chevy 2500HD Duramax LLY CCSB 2.6 Puller "Mistress"
2006 Dodge 3500 Cummins QCSB DD and Tow Rig "Beta" 2001 GMC 2500HD DD "Red Rocket" EFI-Live Tuned and Built By Dan's Diesel Performance. EFILive Beta Tester  |
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09-29-2008, 12:28 AM
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#5 (permalink) |
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Diesel Specialist
Join Date: Jul 2005
Location: Sacramento, CA
Posts: 818
iTrader Score: 0 reviews
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you should be able to turn off the egr with your predator. i know i can with mine. same truck as yours.
your egr could be failing, if you block it and unplug it (when cold) and disable the codes with your predator, it won't matter if it is failing or has failed. good luck
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'05 D/A, Crew, short, 4x4. loaded. |
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09-29-2008, 09:46 AM
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#6 (permalink) |
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Diesel Specialist
Join Date: Aug 2007
Location: South Florida
Posts: 562
iTrader Score: 0 reviews
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If you can shut it off with the predator then no finger stick needed. But a blocker plate is what you need. With the HP up you can force the EGR open without the plate. Is your truck a cali emissions? Ive gotten those codes from my stock tune before but never a change in performance.
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2004.5 2500HD LLY/Allison Crew Cab 4WD Black on Black - Leveled with Bilsten Shocks - EGR Blocker Plate and resonator delete - Roll and Lock Bed with a 60 Gal. custom auxilary tank - Cognito Idler and Pitman Steering Braces - Jotto Laptop Mount - MBRP SS 4" Turbo back exhaust - SD Stainless Steel Tie Rod Sleeves - All on Headlight Mod - Quick release Oil drain valve - EFI Live V2 with DSP5 from SoCalDiesel - PCV Reroute - 3 Gauge A-Pillar with Pyro, Boost and Aux Fuel - LBZ Air Intake MP - 10 and 2 micron in line fuel filters - KD Lift Pump - KD Pump Rub Fix - 
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09-29-2008, 12:48 PM
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#7 (permalink) |
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Diesel Fanatic
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I am going to order a blocker plate and no finger stick if I can turn it off with my predator. Would this cause the truck to miss at an idle?
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Mike 2005 GMC 2500HD LLY/CC/SB/SLE/4x4/SILVER BIRCH METALLIC/NERF BARS/285-60-17 Toyo Proxy STII/17X8.5 WELD RACING EVO VELOCITI 8's/BILSTEIN SHOCKS/DIABLO PREDATOR/EDGE JUICE WITH ATTITUDE/MBRP CATBACK EXHAUST/ Belltech 3" Dropped Shackles and Torsion Bars turned down. |
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09-29-2008, 03:21 PM
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#8 (permalink) |
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Diesel Tuner
Join Date: Apr 2008
Location: Marengo, Illinois
Posts: 2,526
iTrader Score: 1 reviews
Illinois Diesel Power (IDP) Member Midwest Smokers Member |
No it wouln't cause that. That may be a case of harness rub or may need to ice pick # 2 and #7 injector connectors. Do a search for ice pick and injector harness rub. Thats probably what is causing the miss at idle.
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Dan Clarke 2005 Chevy 2500HD Duramax LLY CCSB 2.6 Puller "Mistress"
2006 Dodge 3500 Cummins QCSB DD and Tow Rig "Beta" 2001 GMC 2500HD DD "Red Rocket" EFI-Live Tuned and Built By Dan's Diesel Performance. EFILive Beta Tester |
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09-29-2008, 07:55 PM
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#9 (permalink) |
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Diesel Master
Join Date: Aug 2005
Location: South Carolina
Posts: 1,027
iTrader Score: 1 reviews
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Mine did that as soon as I put exhaust on. I can turn my EGR "off" but I still get the P0401 code............as far as I can tell it has no effect on performance. I can clear it and it runs the same but will come back after a few minutes of running. No CEL light.......and like I said.......doesn't seem to affect anything. Been running around throwing that code for 3 years !! LOL
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2010 GMC CC LB 2500HD LMM WT 4X4-White: -295/70R17 Toyo MT on 08 H2 wheels,cognito braces, SD tr-sleeves,Yellow Bilsteins,LML manifold,Dmaxtuner-Optimized stock tune, added DIC and leather wheel w/ radio/CC 2013 GMC RC LB 2500HD 6.0 WT 2WD-white:- stock just -GI headache bar,GI airflow tailgate, nerf bars, t-bar crank, good truck so far(just not quite a dmax  )Sold- 2009 GMC CC SB 2500HD LMM Z71 4X4-Silverbirch: 295/70R17 Toyo MT ,cognito braces,SD alum.sleeves, Stock tuned ECM swap with deletes,50K miles Sold-2005 GMC CC SB 2500 LLY 4x4-Black: SCIII/1056, 285/H2's,Pred. 2.02(100hp), CAI,MBRP 4" ,KD Twins,SD Sleeves, AM Z gauges,Cognito braces, Bilstein 5100's, 85k miles |
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09-30-2008, 07:55 PM
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#10 (permalink) |
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Diesel Fanatic
Join Date: Dec 2005
Location: Beautiful Downtown Burbank
Posts: 71
iTrader Score: 0 reviews
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mine threw these same two along with 0299, turbo boost. I'm 100% stock except a cat back 4". This is the third time, bad EGR?
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'12 Duramax CC 4WD SB LT |
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