Code P140c, EGR valve

Tiny
GUTIERREZ LUIS
  • MEMBER
  • 2015 GMC SIERRA
  • 6.6L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 90,000 MILES
I installed a new EGR valve and check engine light is still on with same code P140c.
Friday, December 10th, 2021 AT 1:11 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

The code indicates a slow response decreasing flow. Often times this isn't related to the EGR but instead the MAF sensor (mass air flow). Also, a restriction in the air inlet tubes can be an issue as well.

Remove the MAF sensor (see pic 1 below) and inspect it for dirt. I would service it and see if that makes a difference. Here is a link that shows how to service it:

https://www.2carpros.com/articles/mass-air-flow-service

Let me know what you find or if you have other questions.

Take care,

Joe
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Friday, December 10th, 2021 AT 8:34 PM

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