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Engine shuts off at high speed, code P0404

Tiny
ZAMBONI888
  • MEMBER
  • 2000 BUICK LESABRE
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 124,000 MILES
I purchased a second hand work vehicle. The engine light comes on code P0404 comes up on my hand computer. Car shuts off at high speed but after a while it seems something warms up and it runs without shutting off. EGR valve and body control module. Can you help?
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Friday, March 23rd, 2018 AT 9:23 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,416 POSTS
Hello,

It sounds like the EGR valve is shorting out causing he engine to stall. unplug the EGR and take it for a drive to see if the engine stalls? If it runs okay then the EGR valve is to blame.

Here is the location of the EGR valve.

You might what to test the valve as well. Here is a video:

https://youtu.be/DqUCbbKdWf4

Check out the diagrams (below).

Please run some tests and get back to us.

Cheers, Ken
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Sunday, March 25th, 2018 AT 11:47 AM

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