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Idle air control valve? Where its location, code P0506 Limp mode

Tiny
FITO112
  • MEMBER
  • 2006 CHEVROLET TRAILBLAZER
  • 80,000 MILES
Got engine code p0506, I what to fix limp mode myself?
Saturday, November 12th, 2011 AT 2:09 PM

18 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
This code is becasue the throttle actuator is dirty and needs to be cleaned here is a guide that will help

https://www.2carpros.com/articles/reduced-power-limp-mode

This car does not have a IAC valve it is drive by wire and has a throttle actuator here is a guide to explain.

https://www.2carpros.com/articles/how-a-throttle-body-works

Roy
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Saturday, November 12th, 2011 AT 2:17 PM
Tiny
BIGDAWG718
  • MEMBER
  • 1 POST
Thank you for this post I was able to fix my car for almost nothing. I love this site.
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Monday, February 4th, 2019 AT 5:47 PM
Tiny
JOJOGSXR1000
  • MEMBER
  • 1 POST
  • 2004 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 40,000 MILES
Where is my idle air control valve located on my 04 trailblazer?
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Monday, February 4th, 2019 AT 5:48 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the throttle actuator control motor located on the throttle body nothing on the IACV
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Monday, February 4th, 2019 AT 5:48 PM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
  • 2002 CHEVROLET TRAILBLAZER
  • 180,000 MILES
Where is located the idle air control valve, thanks
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Monday, February 4th, 2019 AT 5:48 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
This car does not have a IAC valve it is drive by wire and has a throttle actuator here is a guide to explain.

https://www.2carpros.com/articles/how-a-throttle-body-works

Roy
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Monday, February 4th, 2019 AT 5:48 PM (Merged)
Tiny
PALMER123437
  • MEMBER
  • 6 POSTS
I’m having the same issue. Rough idle. Replaced all plugs and coils. Cleaned the throttle body. Did all the things I’ve seen on this thread and nothing has worked. Could it be the cat converter or O2 sensor?
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Monday, December 23rd, 2019 AT 12:38 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
No to either. If you still have rough running, I would start by doing a compression test.

https://www.2carpros.com/articles/how-to-test-engine-compression

Roy
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Monday, December 23rd, 2019 AT 12:51 PM
Tiny
PALMER123437
  • MEMBER
  • 6 POSTS
So a clogged cat wouldn’t cause it to run rough? I trust your input 100% and will try the compression test. Just trying to have all options on the table if that’s not the cause
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Monday, December 23rd, 2019 AT 1:04 PM
Tiny
ASEMASTER6371
  • MECHANIC
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I understand.

Keep me updated.

Roy
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Monday, December 23rd, 2019 AT 1:06 PM
Tiny
PALMER123437
  • MEMBER
  • 6 POSTS
Will do. Thanks
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Monday, December 23rd, 2019 AT 1:08 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
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Monday, December 23rd, 2019 AT 1:11 PM
Tiny
PALMER123437
  • MEMBER
  • 6 POSTS
Compression is good. What else should I look for? At this point I’m kinda at a loss on what it could be. It’s actually running worse now that I changed the plugs and coils. I read the plug gap is suppose to be 0.40. That’s what I set them at. Unless that’s wrong idk what else could be causing it to run worse now. The old plugs were set at that as well so not sure that’s the problem.
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Wednesday, December 25th, 2019 AT 12:53 PM
Tiny
ASEMASTER6371
  • MECHANIC
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What was the compression on all the cylinders?

Roy
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Wednesday, December 25th, 2019 AT 2:04 PM
Tiny
PALMER123437
  • MEMBER
  • 6 POSTS
Sorry for late reply. They were all around 150
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Tuesday, December 31st, 2019 AT 10:41 AM
Tiny
PALMER123437
  • MEMBER
  • 6 POSTS
The computer says there’s a misfire in cylinder 4. I figured that would be the one that had lower compression. I started out just changing that coil pack. But that didn’t help so I changed all of them as well as plugs.
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Tuesday, December 31st, 2019 AT 10:45 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I would look for vacuum leak, check the plugs and coils as well.

Are there any other codes stored?

Roy
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Tuesday, December 31st, 2019 AT 10:46 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Did you respond? I got an email but nothing came through.

Roy
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Tuesday, December 31st, 2019 AT 11:27 AM

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