I have a 2011 Denali with the air suspension. Last year we had a rear shock fail. It wasn't a leak but rather a sensor or check valve failed. It wasn't a case where the compressor was running constantly though. I only knew about the issue because I had the Service Suspension message in the DIC. I ended up replacing both of them.
Fast forward a year and half or so and we were hitching up our camper and noticed that the compressor never kicked in to level out the truck and even with the weight distribution bars in place it is low in the back so it should be doing something. The camper isn't that heavy probably around 6000 lbs with a GVWR of 6750. The odd thing is there is no warning messages in the DIC about a suspension issue. In the past with my code reader when there was a detected fault I couldn't read it. I had to go to the local Chevy dealer where my cousin works as a tech so he could read it for me. I know that the compressor failure is fairly common in these trucks but in asking my cousin if it that would throw a Service Suspension message and he felt that it would. I checked the fuse and it is good. In thinking about it I am wondering if it is possible that the sensor that detects the rear being low might have an issue. That might explain why the rear end is low and the compressor isn't kicking in. Also why there isn't a warning message.
For those that had compressor failures, did it throw a message or is it like my symptoms where it thinks everything is fine but it isn't doing anything? Anyone know where the sensors are for this system? It seems to me that my father had a similar issue many years ago with the Autoride in his 03 Tahoe. It was a sensor on the front suspension somewhere if I remember. That was probably 10 years ago though and a different generation truck so the system might be completely different. I also don't really know when it stopped working. We don't tow much for trailers in the winter. It worked last fall though.
Thanks
Fast forward a year and half or so and we were hitching up our camper and noticed that the compressor never kicked in to level out the truck and even with the weight distribution bars in place it is low in the back so it should be doing something. The camper isn't that heavy probably around 6000 lbs with a GVWR of 6750. The odd thing is there is no warning messages in the DIC about a suspension issue. In the past with my code reader when there was a detected fault I couldn't read it. I had to go to the local Chevy dealer where my cousin works as a tech so he could read it for me. I know that the compressor failure is fairly common in these trucks but in asking my cousin if it that would throw a Service Suspension message and he felt that it would. I checked the fuse and it is good. In thinking about it I am wondering if it is possible that the sensor that detects the rear being low might have an issue. That might explain why the rear end is low and the compressor isn't kicking in. Also why there isn't a warning message.
For those that had compressor failures, did it throw a message or is it like my symptoms where it thinks everything is fine but it isn't doing anything? Anyone know where the sensors are for this system? It seems to me that my father had a similar issue many years ago with the Autoride in his 03 Tahoe. It was a sensor on the front suspension somewhere if I remember. That was probably 10 years ago though and a different generation truck so the system might be completely different. I also don't really know when it stopped working. We don't tow much for trailers in the winter. It worked last fall though.
Thanks
