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Check engine light

Tiny
JOANIE0716
  • MEMBER
  • 2004 DODGE RAM
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 126,388 MILES
The check engine light keeps coming on. My son changed all four sensors and the EGR valve and a code comes up P0405. He also cleaned the carbon out we change the air filter and still comes on. I sometimes drive it for a day with out it coming on. And pop here it comes. Need to get my truck inspected please help.
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Sunday, February 11th, 2018 AT 9:33 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,752 POSTS
The code indicates an EGR issue. Here is a video on how to check it:

https://www.youtube.com/watch?v=DqUCbbKdWf4

I have also attached a picture of one to help you locate it. Note: The code is generic. However, I would recommend confirming it works properly. Also, make sure the wiring to the EGR is in good condition, not damaged, corroded. A poor connection can cause a false reading to the ECM.

One last thought, remove the EGR and make sure there is not a carbon build up.
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Sunday, February 11th, 2018 AT 8:21 PM
Tiny
JOANIE0716
  • MEMBER
  • 2 POSTS
Hi guys, well my son checked everything. Repaired what needed to be repaired. Last night he took it for a ride and check engine light stay off. I get in it this morning to go to work and it is back on. Please help. Do not know what else to do.
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Tuesday, February 13th, 2018 AT 10:19 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Did you replace the EGR valve?
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Tuesday, February 13th, 2018 AT 10:21 AM
Tiny
JOANIE0716
  • MEMBER
  • 2 POSTS
How many miles do I have to drive after the check engine light is off? Before I get it inspected?
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Tuesday, February 13th, 2018 AT 10:11 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Once the codes are cleared you will need to drive it long enough for the monitors to reset which is about 50 miles.
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Wednesday, February 14th, 2018 AT 10:15 AM

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