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post #1 of 11 Old 11-17-2012, 12:36 PM Thread Starter
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P401

P 401 code on after I did the IPR gen 2 delete. The truck is a 03 I thought the 03 wouldn't throw a code? And the egr valve doesn't come out with those kits so I'm kinda confused.
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post #2 of 11 Old 11-17-2012, 01:30 PM
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I bet it doesn't set the check engine light though. That's the difference

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post #3 of 11 Old 11-17-2012, 01:31 PM
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It will throw a code but doesn't usually set the check engine light.

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post #4 of 11 Old 11-17-2012, 02:10 PM Thread Starter
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Ya it set the light off, cleared it and and took it for a quick spin and it hasn't come back on yet. Just wondering why it would set the light off with the valve still in?
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post #5 of 11 Old 11-17-2012, 02:23 PM
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It's not checking that the valve is there or not. The code is for insufficient flow to valve. Has insufficient flow because the cooler is gone.

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post #6 of 11 Old 11-17-2012, 03:50 PM
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I've never heard of an 03 setting light for EGR. I know a guy who runs with the latest calibration and the valve completely unplugged and it doesn't even set a light.

Any other codes besides insufficient flow?

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post #7 of 11 Old 11-17-2012, 03:57 PM
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My cooler is blocked and ill get a 401 randomly like once a year. Cooler and valve installed. No big deal.

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post #8 of 11 Old 11-17-2012, 04:13 PM Thread Starter
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No other codes yet! Wonder if I should get a block off kit and take it out?
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post #9 of 11 Old 11-17-2012, 04:31 PM
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A block off would do the same thing. I wouldn't worry about it.

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post #10 of 11 Old 11-18-2012, 04:05 AM
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my 04 chucks an 0401 and an 0403,never a cel.,I have a blockoff plate,but leave the valve plugged in,'cause I was having problems with clutch fan kicking in and out alot.

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