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Old 11-21-2010, 09:16 PM   #1 (permalink)
JasonJ
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Trouble code P0401 EGR system fault, is it a big deal?

My check engine light comes on very randomly, but will sometimes go for months in between. It happens most frequently on long trips, but always goes off after 3 or 4 short trips afterward. I cant tell any difference in the way it runs when the light is on. It came on today during a 3 hour trip and i had enough of wondering , so i stop at an AutoZone and have the hook the scanner thing up to it and it was this P0401 code that said:

EGR system fault
The ECM has detected too little flow on the EGR system. Probable causes: Blocked passage on EGR system, Failed EGR valve, EGR solenoid faulty, Failed EGR pressure sensor where applicable, Failed EGR position sensor where applicable. So the counter monkey types the code into the magic AutoZone computer and it said my truck didnt have an EGR valve, did not apply. Ok, what gives???

Is this anything i need to be worried about? Im not an expert but ill list the few little things i have done to the truck in case it matters.. but ive had this problem ever since i bought the truck stock with 14k on it. The truck is an 06 LBZ, 45k miles, Edge Juice, exhaust kit no cat, and larger wheels 22.5".

Thx for any advice you guys can provide.
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Old 11-21-2010, 09:19 PM   #2 (permalink)
JasonJ
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One quick note if this matters:
The VatoZone guy did ask me if it was the 6.6 HO or the regular one??? I told him the HO... because i didnt know, and figured it didnt matter anyway.
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Old 11-21-2010, 09:46 PM   #3 (permalink)
shookme
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P0401 is setting because you are missing the catalytic converter. I'll bet you a beer I'm right.
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Old 11-22-2010, 12:06 AM   #4 (permalink)
Drumaniac3000
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Quote:
Originally Posted by JasonJ View Post
One quick note if this matters:
The VatoZone guy did ask me if it was the 6.6 HO or the regular one??? I told him the HO... because i didnt know, and figured it didnt matter anyway.
The 6.6 HO is LBZ (VIN D) the other version is the 06LLY (VIN 2) and no it doesn't matter.
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Old 11-22-2010, 10:44 PM   #5 (permalink)
JasonJ
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Ok, good to know. Thx for the info fellas.
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Old 11-23-2010, 06:52 AM   #6 (permalink)
axlenut
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EGR code is usually P 0403, at least mine was.
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