"Check Engine Light" Code PO506 - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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  #1  
Old 02-15-2008, 09:42 PM
mmsmith2032 mmsmith2032 is offline
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2005 GMC Envoy SLT
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"Check Engine Light" Code PO506

Hoping someone can help me. I'm new to this forum and am having a problem with my 2005 GMC Envoy (42,000 miles). About two weeks ago, my check engine light came on and has stayed on most of the time since then. Anyway, I took it to Autozone and they ran a diagnostic test. They came up with code PO506. According to the printout this means low engine speed and probable causes could be:

1. Vacuum leak on engine.
2. Dirty throttle body.
3. IAC motor defective
4. Poor electrical connection to the IAC valve.

Can anyone give me on any guidance on what to do/look for? I took a quick look and didn't see any exposed vacuum hoses. Thanks in advance!
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  #2  
Old 02-15-2008, 10:00 PM
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RayVoy RayVoy is offline
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You may be the first to report code 506. But a lot of us, myself included, have had idle, or coming off idle, problems. The consensus, I am sure, will be a dirty throttle body. We have a very good article (Articles menu button) on cleaning the tb. I'd dig it out for ya, but I found most of the articles very interesting when I joined. Go in and take a look, there are maintenance topics and some nice mods. Very good reading.
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  #3  
Old 02-16-2008, 12:15 PM
TM600 TM600 is offline
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2004 Chevy TrailBlazer LT EXT
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Subject: SES Light Due To DTCs P0105 P0106 And/Or P0506 - Clean Throttle Body -

4.2L (VIN S - RPO LL8)




--------------------------------------------------------------------------------

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
On rare occasions, a SES light may be experienced due to DTCs P0105, P0106, and/or P0506. There may or may not be an idle complaint accompanying the SES light. This may be due to excessive carbon build up in the throttle body.
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  #4  
Old 02-16-2008, 02:21 PM
mmsmith2032 mmsmith2032 is offline
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I took the throttle body of as described in the article, cleaned it with carb cleaner and reinstalled. The light was off when I started it (I am assuming because I disconnected it) and came back in by the time I had backed out of the driveway. Now I don't know what to do.
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  #5  
Old 02-16-2008, 03:18 PM
JosueZQ8 JosueZQ8 is offline
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You might still have to have the light cleared out of your comp. GMT355's have the same problem all the time. Mine happened a few months ago, same symptoms, same code. I work at a body shop and we have a few scanners, so I just cleared the light when I left work, went straight home and cleaned out my TB. WHAT A DIFFERENCE!!! Light hasn't been on since and my truck runs 1000X better.....
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Old 02-16-2008, 08:34 PM
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Quote:
Originally Posted by mmsmith2032 View Post
I took the throttle body of as described in the article, cleaned it with carb cleaner and reinstalled. The light was off when I started it (I am assuming because I disconnected it) and came back in by the time I had backed out of the driveway. Now I don't know what to do.
Was the tb dirty? It could just be a reset problem as JosueZQ8 suggests, if it comes back after a reset, look for a loose/off/cracked vacuum line.
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  #7  
Old 02-18-2008, 09:10 AM
mmsmith2032 mmsmith2032 is offline
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2005 GMC Envoy SLT
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I drove the Envoy for about a half hour (mostly over 40MPH) and then disconnected the battery for about an hour. I then reconnected it and drove it for a half hour non-stop at mostly highway speeds. The light stayed off. However, when I went to drive the truck a couple hours later, the light was on again and has stayed on since.
The throttle body, when cleaned, had a light coating of black carbon but didn't seem to be gummed up. I looked for a loose vacuum hose initially but did't even really see any hoses. Everything that looked like it could be a hose seemed to be wrapped in a black corrogated tube and I think most of it was wiring. Any other suggestions? Thanks!
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  #8  
Old 02-20-2008, 09:35 PM
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gearjamminjake gearjamminjake is offline
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2005 Chevy TrailBlazer LT EXT
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Quote:
Originally Posted by mmsmith2032 View Post
I drove the Envoy for about a half hour (mostly over 40MPH) and then disconnected the battery for about an hour. I then reconnected it and drove it for a half hour non-stop at mostly highway speeds. The light stayed off. However, when I went to drive the truck a couple hours later, the light was on again and has stayed on since.
The throttle body, when cleaned, had a light coating of black carbon but didn't seem to be gummed up. I looked for a loose vacuum hose initially but did't even really see any hoses. Everything that looked like it could be a hose seemed to be wrapped in a black corrogated tube and I think most of it was wiring. Any other suggestions? Thanks!
did you ever actually have the code cleared. sometimes the whole unhook the battery for an hour trick doesn't work or will work for a short time as in your case. heck it could be a loose hose or something too. i know autozone wont actually "clear" a code for you. they aint supposed to. sometimes you can talk them into it though.
you might think about buying a code scanner. i got one like five years ago from auto zone, saved me alot of headaches. i think theyre like $80 maybe?
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  #9  
Old 02-20-2008, 09:38 PM
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Bodyslide Bodyslide is offline
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2006 Chevy TrailBlazer LT
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Quote:
Originally Posted by mmsmith2032 View Post
Hoping someone can help me. I'm new to this forum and am having a problem with my 2005 GMC Envoy (42,000 miles). About two weeks ago, my check engine light came on and has stayed on most of the time since then. Anyway, I took it to Autozone and they ran a diagnostic test. They came up with code PO506. According to the printout this means low engine speed and probable causes could be:

1. Vacuum leak on engine.
2. Dirty throttle body.
3. IAC motor defective
4. Poor electrical connection to the IAC valve.

Can anyone give me on any guidance on what to do/look for? I took a quick look and didn't see any exposed vacuum hoses. Thanks in advance!
Where are you located? Someone might be close to you that has a code reader that you can go and have them clear it for you for free....This might take care of the issue.....Good Luck
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  #10  
Old 02-21-2008, 11:08 AM
mmsmith2032 mmsmith2032 is offline
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2005 GMC Envoy SLT
Liquid Silver Metallic 4.2L I6 4X4
Join Date: Feb 2008
Location: Illinois
Posts: 20
Thanks for all the great info! I live in the far west suburbs of Chicago. I have an appointment to take the Envoy into the dealer next Monday but am hoping I can avoid it since it isn't under warranty anymore. Also, I read that it could be seal connecting the throttle body or that it may need a new IAC valve. Any feedback on either of these?
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