2008 Denali "Service Suspension System" message

[Snicklefritz303]

I was receiving a "Service Suspension System" message on the dash of my 2008 Yukon Denali for a while, I took it into the dealer who said that I needed to replace the rear shocks and wanted $1200 for it. I decided to replace the shocks myself with the Arnott AS-2708 re-manufactured shocks. After replacing the shocks I am still getting that "Service Suspension System" message on the dash. Any thoughts on what may be causing that or anything I should check before taking it back to the dealer?

 

[OHSIXX]

Easiest way is to have it scanned to see what is tripping the message...can be a multitude of things from compressor to sensors to module....have you heard the compressor kick on since the rears were replaced? Autoride is nice but can be a PITA if problems occur....

 

[Snicklefritz303]

The Service Suspension System msg only comes on intermittently with no real rhyme or reason for doing so. I have not heard the compressor come on but have been the only one in the truck since replacing the rear shocks and have not had any weight in the vehicle.

 

[02Burgundybeast]

Make sure your leads are plugged in tight to the shocks and are not crimped. They could be loose.

 

[08grey]

Lay under the truck squeeze the bladder on the shocks. Are they hard? Ie full of air. Start there.

 

[Snicklefritz303]

The shock bladders are not firm. Would the bags inflate if there was no load on the vehicle causing the compressor to switch on?

 

[1clean08denali]

When mine did thay it was the little levelers qhere off it will kick a service suspension on the dash and in return cut the compressor off. Took it to the dealer and had my buddy put it up on the rack to figure it out. Took him about 4 min to fix.

 

[08grey]

Yes they will always be firm.

 

[ulakovic22]

You need to check all the connections underneath and make sure everything is hooked up. Air bladders should have air in them all the time, so check compressor and leveling sensors

 

[K9Caddy]

More than likely it's the compressor. You can purchase new on Amazon for about $250 and instal in less than 30min.

 

[Snicklefritz303]

Is there a way to test the Compressor before I go out and buy a new one?

 

[ulakovic22]

I'm sure there are several ways to do this, but I would just grab the +12V lead and run a jumper to it and see if it kicks on at all. When mine died it was a slow death and when it would kick on you could just hear it getting louder and running slower until it just stopped turning on.

 

[Snicklefritz303]

So I jumped the ALC relay pins 30 to 87 (YouTube link below showing how) and the compressor works and now there is some pressure in the air bladders. Still receiving the intermittent Service Suspension System on the dash.

https://www.youtube.com/watch?v=0ub_AdR7pTY

 

[ulakovic22]

Did you get under there and check all your connections? Something isn't sending a signal to the compressor to turn on and air up the bags. It could be the leveling sensors are not reading that it needs to be leveled out or the electronic dampening connector is not hooked up or the wires are crimped or shorted out.

 

[08grey]

Follow the strut all the way up to the frame. The plug at the top of the strut likes to come loose when rebooting in the strut. Especially on the passenger side. Grab the plug and squeeze it, see if it clicks. I've seen this happen a couple times.

 

[Snicklefritz303]

Follow the strut all the way up to the frame. The plug at the top of the strut likes to come loose when rebooting in the strut. Especially on the passenger side. Grab the plug and squeeze it, see if it clicks. I've seen this happen a couple times.

I actually did run into this when installing the new shocks and my dash lit up with ABS warnings as well as Traction Control warnings. I got under the car again last night and checked all the connections, all connections are good and plugged in. I'm afraid at this point I might be making another trip to the dealer to get them to run the codes unless anyone has any other suggestions.

I'd also like to thank everyone who has commented and tried to help with this issue, I really appreciate the help everyone!

 

[t.stimpson]

seems like i read somewhere that there is some connection on top of the frame rail near the compressor that people have bumped and caused the air ride light to come on???? Or am I crazy? lol. Anyways maybe you bumped that when installing the shocks, dunno. I dont think you can see it, but you can feel it.

 

[NORCAL SS]

give me a call. Ill walk you thru it over the phone

 

[JennaBear]

Just got mine back from the dealership. I was throwing code C0585 #4, and we were unable to fix it at home. They had it for less than a day, and replaced the left rear shock absorber. There was an open circuit.

Hopefully that helps anyone else with this issue!