Recurring EGR codes P1404 and P0404?

Tiny
JR47
  • MEMBER
  • 1999 PONTIAC GRAND PRIX
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 304,922 MILES
Have two reoccurring codes P1404 and P0404. Leaving work this morning the car hesitated a bit while accelerating and about 30 minutes later the car stalled while driving at a low speed. I replaced the EGR about 2 years ago and the codes have been coming back on and off over the past few months but that's the first time it's ever shut off while driving. It started up just fine after and I was able to drive home but any idea on where to start?
Tuesday, April 11th, 2023 AT 2:46 AM

4 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,622 POSTS
The P1404 and P0404 codes are related to the Exhaust Gas Recirculation (EGR) system in your vehicle. These codes could indicate that there is a problem with the EGR vacuum solenoid or the EGR pressure sensor or you have a clogged passage. I would remove the EGR and clean the passages. Please let us know what happens.
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Tuesday, April 11th, 2023 AT 12:02 PM
Tiny
JR47
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Removed the EGR and cleaned the passages, there wasn't really any build up at all anywhere but haven't had any symptoms like the other day. Drove for quite some time yesterday and everything seemed fine, and the service engine light hasn't come back on yet.
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Wednesday, April 12th, 2023 AT 5:32 AM
Tiny
JR47
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The service light came back for the p0404 and the CAT and EVA symbols on my scanner where blinking red if that helps but I did feel a little hesitation again when accelerating.
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Wednesday, April 12th, 2023 AT 4:29 PM
Tiny
KEN L
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I would replace the EGR valve even though I know you replace it a couple of years ago. They had problems with this particular valve.
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Thursday, April 13th, 2023 AT 11:20 AM

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