Smokymance
Boosted
I know few people have had "check suspension system" codes and their rear shocks dont air up anymore. This happened to my 2008 Yukon Denali with auto ride rear suspension.
It has Tonys Belltech kit with the 2/4 drop on it. I installed the kit about exactly one year ago (I remember cause it was cinco De Mayo last year, if you get the relation, lol).
About a month or two ago it started giving me an error code "check suspension system" and it wouldn't air up. Rear shocks were soft with no air at all. The rear started sagging and id hear some rubbing around some sharper turns. Scanned the codes with the BCM scanner and it gave me C0660 Exhaust valve circuit fault.
After some research on All Data and my engineer friend at GM, we figured out that a possible cause could be what some people were stating as " a white wire was rubbing against the frame and corroded". Figured this might be the scenario as it would randomly work once in a while. By looking under the truck it wasnt obvious where this white wire was, but after removing the compressor, it was pretty obvious. Here are some pics i took
You could tell truck had the rear down a bit. measured Driver 34.5 and pass 34.25 on the rear.
On the pass side behind rear wheel the compressor hides...we noticed that the bushings were pretty loose and worn out...still have to replace or come up with something sturdier.
http://www.youtube.com/watch?v=e3A-LOYgtik
Here is the compressor removed, and you can see the white wire exposed and corroded...it literally was about 1/2 of corrosion under the wire coating.
We opened the little assembly to the right...it was sealed and had an oring at the bottom...not sure what this does, but we were careful not to damage anything.
..and the wires ran inside...
We basically just extended the wire, sottered, resealed with rtv and put it back together.
Put everything back together with more protection around the wiring so it doesnt rub again.
Started it and aired right up. Stance with air up: 35.5 and 35.25 on rear fender heights
Hope this saves someone some money on a new compressor if its just a tiny wire corroded.
Id like to thank my friend Don for all the help, Mike for the scan codes and Tony for all the quick replies.
It has Tonys Belltech kit with the 2/4 drop on it. I installed the kit about exactly one year ago (I remember cause it was cinco De Mayo last year, if you get the relation, lol).
About a month or two ago it started giving me an error code "check suspension system" and it wouldn't air up. Rear shocks were soft with no air at all. The rear started sagging and id hear some rubbing around some sharper turns. Scanned the codes with the BCM scanner and it gave me C0660 Exhaust valve circuit fault.
After some research on All Data and my engineer friend at GM, we figured out that a possible cause could be what some people were stating as " a white wire was rubbing against the frame and corroded". Figured this might be the scenario as it would randomly work once in a while. By looking under the truck it wasnt obvious where this white wire was, but after removing the compressor, it was pretty obvious. Here are some pics i took
You could tell truck had the rear down a bit. measured Driver 34.5 and pass 34.25 on the rear.
On the pass side behind rear wheel the compressor hides...we noticed that the bushings were pretty loose and worn out...still have to replace or come up with something sturdier.
http://www.youtube.com/watch?v=e3A-LOYgtik
Here is the compressor removed, and you can see the white wire exposed and corroded...it literally was about 1/2 of corrosion under the wire coating.
We opened the little assembly to the right...it was sealed and had an oring at the bottom...not sure what this does, but we were careful not to damage anything.
..and the wires ran inside...
We basically just extended the wire, sottered, resealed with rtv and put it back together.
Put everything back together with more protection around the wiring so it doesnt rub again.
Started it and aired right up. Stance with air up: 35.5 and 35.25 on rear fender heights
Hope this saves someone some money on a new compressor if its just a tiny wire corroded.
Id like to thank my friend Don for all the help, Mike for the scan codes and Tony for all the quick replies.
It just sounds like it is showing its age and needs to be replaced down the road. In my job...as our power supplies age they get louder and louder as well until we replace them. As long as it doesn't bother you-put it on the future to-do list...
