08 Yukon denali air ride. I have the service suspension msg on the dash. I was told by a local shop my compressor was bad so i replaced it.

[Camaro71]

08 Yukon denali. Service suspension msg on the dash. I was told by a local shop my compressor was bad. So I replaced it. Not the problem. It doesnt cycle when the key is turned on. Both rear level sensors have been replaced a yr ago. If I jump the relay plug it will run. Anyone have this issue? Thanks

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

What brand of compressor did you buy?

 

[Camaro71]

I put a doorman compressor in.

 

[Doubeleive]

08 Yukon denali. Service suspension msg on the dash. I was told by a local shop my compressor was bad. So I replaced it. Not the problem. It doesnt cycle when the key is turned on. Both rear level sensors have been replaced a yr ago. If I jump the relay plug it will run. Anyone have this issue? Thanks

need more details...
do the rear shocks hold air? they should inflate and stay inflated for days or even weeks, they should also still be inflated after a drive and not cycling the key
there are other specific things the pump will do like release some pressure after sitting parked for a minute or so and it will also release some pressure just before it turns on to inflate the shock bladders. It should also kick on if you have the key on or engine running and add a good amount weight to the rear end.
also to be more specific the service suspension message usually comes on because of a shock sensor or maybe a ride height sensor, you might want to check all 4 corners on both.
a tech2 or other ""high end" scanner like a snap on, etc will give you the specific code that is triggering the error otherwise it's a guessing game, a run of the mill obd scanner will not read the code, the code is a bcm code.

 

[Camaro71]

The shocks hold air. I havent found any leaks. I dont have a scanner. So trying to do this on my own. I guess I need to go back to the local shop. Thanks for the reply.

 

[Joseph Garcia]

The Dorman compressor does not cycle on/off in a test mode function every time that you start the truck, like an OEM compressor does.

 

[Camaro71]

Hmm, I didnt know that. Thanks !

The Dorman compressor does not cycle on/off in a test mode function every time that you start the truck, like an OEM compressor does.

 

[Camaro71]

I just checked the bags & both are flat so it has to be calling for inflation. Not sure what to check next?

 

[Tahoe14]

Could have something to do with the Doorman compressor since it operates like Joseph was explaining. Was there a big difference in price between Doorman and GM part. Do not pay Dealer prices, check Rock Auto, Ebay and Amazon. Good luck.

 

[wjburken]

I have ran both Dorman and Arnott compressors on my vehicles with no issue.

Have you ever heard the new one run? Have you checked the fuse?
When I’ve swapped compressors, they came with a new relay that goes under the hood. Did that get swapped?

 

[Camaro71]

I have ran both Dorman and Arnott compressors on my vehicles with no issue.

Have you ever heard the new one run? Have you checked the fuse?
When I’ve swapped compressors, they came with a new relay that goes under the hood. Did that get swapped?

I didnt get a relay with the new compressor. I have bench tested the original one & it's functional. All fuses are good.

 

[Joseph Garcia]

I did not receive a new relay with my Dorman air compressor purchase, and while it does not go through the test cycle each time that I start the truck, it is functioning as it should with respect to inflating the shocks as needed.

Just to be sure... Do you have the electrical wires connected to all 4 shocks?

 

[Camaro71]

I did not receive a new relay with my Dorman air compressor purchase, and while it does not go through the test cycle each time that I start the truck, it is functioning as it should with respect to inflating the shocks as needed.

Just to be sure... Do you have the electrical wires connected to all 4 shocks?

Yes & I did discover today the bags are leaking. So new shocks are on the way. Hopefully 1 of the shock sensors was messed up & not letting the compressor run. Who knows. Time will tell. Thanks for the reply.

 

[George B]

There is some helpful info here.

Autoride suspension help

I have a 2009 Yukon Denali Xl. For the past few months the Autoride compressor has been super noisy and running constantly. 2 weeks ago, I decided to replace the rear shocks with Arnott rebuilt units. After replacing the compressor was still noisy which is knew it would be, but it would run as...

www.tahoeyukonforum.com

 

[Camaro71]

I replaced the relay today. Still no luck. My new gm shocks will be deliverd tomorrow (ouch ! $$$). Does anyone know if the electronic sensors in the shocks can cause an issue with the compressor not turning on?

 

[Joseph Garcia]

I replaced the relay today. Still no luck. My new gm shocks will be deliverd tomorrow (ouch ! $$$). Does anyone know if the electronic sensors in the shocks can cause an issue with the compressor not turning on?

It is the difference in reference voltage readings between the front and rear ride height sensors (on the suspension arms) that control whether or not the suspension system calls for the air compressor to turn on to adjust rear ride height.

The electronics within the shocks are not related at all to the ride height adjustment. The yaw sensor provides most of the input for the electronic control system that connects electronically to the shocks and adjusts their stiffness.

 

[Camaro71]

Well the saga of my air ride suspension is solved. I replaced both shocks & now the pump cycles when I turn the key on. $700.00 later & Finally its working! Thanks everyone for the help, greatly appreciated !

 

[Tahoe14]

Good to hear and glad you got it working.

 

[Joseph Garcia]

Thank you for posting the solution to your issue. Much appreciated.

If you have a bi-directional scanner, reset the automatic level control (ALC), just to be sure that your reference points are correct for level operation.

 

[Doubeleive]

The Dorman compressor does not cycle on/off in a test mode function every time that you start the truck, like an OEM compressor does.

mine does 99% of the time, just like oem