Pesky code
Thread Starter
Melting Slicks
Joined: Feb 2008
Posts: 2,977
Likes: 4
From: Delmar Delaware
Pesky code
For the last couple of weeks,anytime I am riding with the AC on, I get a PC 0492 code in the DIC. I know it's got something to do with the AIR system. I just don't know how to fix it. Anyone have any experience with this?
Burning Brakes
Joined: Sep 2007
Posts: 860
Likes: 3
I did a quick search and it looks like the check valve may be sticking or bad. This post wil help you locate it - the most common suggestion seems to be spray so WD40 or carb cleaner into it to see if you can loosen it up - if not then replace it
http://forums.corvetteforum.com/c5-t...eck-valve.html
http://forums.corvetteforum.com/c5-t...eck-valve.html
Advanced
Joined: Jun 2007
Posts: 68
Likes: 0
From: Arlington Texas
I had the same code show up two weeks ago and was directed to the same post. After about a third of a can of carb cleaner and some compressed air, I reset the code on my daily driver and it has yet to return. Trust the forum........it works.
Tech Contributor
Joined: Jan 2004
Posts: 20,030
Likes: 289
From: Wylie TX --> Less is More, except under the hood !
I had a P0491 code last Sunday driving to work. I just turned around and left the car in the garage till today when I had a chance to look into it. I checked all of my work changing the oil and its perfect. Did some searching around and found people saying the check valve is the issue. I just started using my AC on the car recently... Maybe has something to do with the valve sticking? I am going to have to read that other post on how to figure this out how to do it... 
Thanks !
Toque
Thanks !
Toque
Advanced
Joined: Jan 2009
Posts: 66
Likes: 0
From: Klamath Falls OR
I had the same problem. Followed the thread instructions and cleaned the valve and cleared the code. Was okay for a week and then came back twice in the next week. Cleared the code and haven't seen it for six weeks. Still going to change the valve this winter.
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Tech Contributor
Joined: Jan 2004
Posts: 20,030
Likes: 289
From: Wylie TX --> Less is More, except under the hood !
Toque
