P0401 code fix

Tiny
MIKE MAREI
  • MEMBER
  • 2008 CHEVROLET UPLANDER
  • 200,000 MILES
I drove it fine the next day I heard noise then the engine light came on code number p0401?
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Friday, March 16th, 2012 AT 1:28 PM

1 Reply

Tiny
BORIS K
  • EXPERT
Hello,

P0401 relates to insufficient flow from EGR valve. This can be caused by a faulty EGR valve or a blocked EGR passage from the valve to the inlet manifold.

How to access and clean the EGR passages in the inlet manifold.

https://youtu.be/Xh9ieHEfUB4

See picture below how the EGR valve looks like.

Please let us know how you get along.

Cheers, Boris
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Tuesday, October 12th, 2021 AT 9:04 AM

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