'Service Suspension System', 2010 Yukon Denali

[Tim907356]

Same on the other side: 4.3-4.4 ohm. Quite a mystery then.

 

[George B]

Do you mean a 3157?

Yup, fixed it.

 

[George B]

Same on the other side: 4.3-4.4 ohm. Quite a mystery then.

Need a scanner to find out whats up.

 

[Doubeleive]

Same on the other side: 4.3-4.4 ohm. Quite a mystery then.

was the error there before the rear shocks were done?, if so check the front ones.
if nothing obvious then you need a scanner that can read body codes because the code will point you too to it

 

[Tim907356]

Nope: Before the shock replacement there was no message. New with the new shocks. Strange; I would think a code would come up (with a msg.) if they failed to inflate. And they did inflate when I first installed them. Question is, will they continue to work even with the message?...

Edit: I dropped my travel trailer on the hitch, which dropped the rear end ~2.5" Interestingly, the bladders stayed inflated from when they originally blew up, giving a little bit of height adjustment. However, with the message onscreen every time I fire up the Yukon, the compressor will not start to re-inflate the shocks. So that answers that; No ALS.

 

[Doubeleive]

Nope: Before the shock replacement there was no message. New with the new shocks. Strange; I would think a code would come up (with a msg.) if they failed to inflate. And they did inflate when I first installed them. Question is, will they continue to work even with the message?

they should, I would try and find a way to get the code regardless

 

[Tim907356]

O.K....Riddle me this Batmen!! I read somewhere to disconnect the battery (which I didn't do when installing the new shocks) so I just went out and pulled the positive for about 10min. Hooked it back, jumped back in and turned the key. No message, and the compressor fired up for ~5s., and jacked it back up. So I turned off the key, waited a minute, turned it back on, and Service Suspension returns. So it works, it just doesn't work.
I'll get the code.

 

[adventurenali92]

I very well could have misunderstood. if he's still getting codes. you're probably right.


I know money is tight for everyone, but the oem shocks that keep the mag ride are the best option. shame they are so expensive

FYI this generation of Denali did not come with mag ride suspension setup. The only SUVS in the GMT900 lineup that got that option was the Escalades. The Denali trimmed SUVs will have virtually the same Z55 autoride suspension setup just like the previous gen trucks, although from what I understand they’re a bit beefier then the previous gen and some tweaks were made that I can’t remember off the top of my head.

 

[Tim907356]

The only code showing is c0045 rear wheel speed sensor. That with an Actron at advance auto.

 

[gooffeyguy]

FYI this generation of Denali did not come with mag ride suspension setup. The only SUVS in the GMT900 lineup that got that option was the Escalades. The Denali trimmed SUVs will have virtually the same Z55 autoride suspension setup just like the previous gen trucks, although from what I understand they’re a bit beefier then the previous gen and some tweaks were made that I can’t remember off the top of my head.

It's not mag ride, which is adjustable with a switch/dial, but auto ride. The shocks contain a magnetic fluid that is controlled by a computer. That's why both the front and rear struts/shocks have wires that plug into them

 

[gooffeyguy]

@Joseph Garcia
I know you recently went through some problems with your autoride system and you replaced the controller. I can't remember exactly what it's called. Did you have error messages beforehand and if so, which ones?

 

[Joseph Garcia]

The part is the Active Suspension Control Module, and it did not generate any codes. My concern was the when tracking the activity of the 4 level sensors in real time while driving on rough surfaces (washboard dirt road), I did not see a corresponding change in the % damping of the four shocks. Some damping was there, but not enough, IMO. When I inspected the Module, by loosening the bolts holding it in place, the frame of the Module literally disintegrated in my hands. So, I decided to replace it.

 

[Tim907356]

Is the circuit in the shock simply a resistor, or is there some variable feedback from it, like pressure, or position?

 

[gooffeyguy]

Is the circuit in the shock simply a resistor, or is there some variable feedback from it, like pressure, or position?

Reading the post above yours suggests that there is feedback

The Autoride and Autolevel kind of work in conjuntion. The Autolevel is the air shocks and ride height sensors. The Autoride is the fluid in the shocks being softened or stiffened to give the best damping for the road conditions

 

[Tim907356]

So the connector goes to a heater then, that should be a certain resistance, if that’s the functionality.

 

[Tim907356]

So, the codes have been read, and here’s what I have:

C0660 - level control exhaust valve circuit short to ground or open circuit.

I suppose since the old shock never pumped up, they never needed to exhaust. Now the valve is frozen. Mystery solved, but problem remains…the decision to repair or replace is next.

 

[gooffeyguy]

If replacing the pump, The Dorman model has good reviews and a lifetime warranty

 

[Tim907356]

So to finalize the thread, I went back to the same guy with the $89 shocks and bought the matching compressor. Alls well now; no message and the system worked fine. So we load up the 27’ camper for a week on the road, and 5mi. out, the wife says ‘What’s that noise?’ It was the shocks evacuating. So we drove 250mi. Squatting the rear. I thought the cheap bags had blown. However, it was the cheesy littler retainer clips on the plastic manifold that holds the airlines in! A pair of pliers and some quick bends on the clips, and it’s working again.
I now know way more than I should about the ALS in my Denali!