Where is the air compressor for the ride control on 06 gmc denail

Anonymous wrote the right answer.

Anonymous Jan 02, 2022

What kind of scan tool ? Will it scan all the modules on the vehicle or is it just OBD2 type ? Did you check wiring diagrams an test electrical circuits for air ride an test with a DVOM - digital volt ohmmeter ? Do you know how to test ALC relay circuits . You replaced a bunch of parts that probably were not needed (,air ride compressor, fuses and ALC relay and the compressor still won't work ) ?

Which of these does your vehicle have

Automatic Level Control
Electronic Suspension Control (ESC)
The vehicles rear leveling compressor motor is switched on and off via a compressor motor relay which is controlled by the suspension control module. The suspension control module provides a switched path to ground whenever compressor activity is required. The suspension control module continually monitors the compressor motor relay circuitry to determine if the voltage level agrees with the commanded state.

DTC C0655 Level Control Compressor Circuit

DTC C0660 Level Control Exhaust Valve Circuit

The exhaust solenoid valve is switched on and off via the suspension control module. The suspension control module provides a switched path to ground whenever exhaust activity is required and during a compressor "head-relief" sequence which occurs at compressor start-up if system pressure is lower than 68.95 kPa (10 psi). The suspension control module continually monitors the exhaust solenoid valve circuitry to determine if the voltage level agrees with the commanded state.

DTC C0711 Level Control Air Pressure Sensor Circuit

Circuit Description
The suspension control module uses a 5-volt analog air pressure sensor to determine the amount of air pressure in the automatic level control (ALC ) system. The valid signal voltage range of the sensor is 0.15-4.85 volts. The sensor signal voltage will increase and decrease within the valid voltage range as system pressure increases and decreases.


Your best bet ,take it to a qualified repair shop that knows what they are doing .

First you need to have Suspention Control Module scanned to retvieve troube codes.
The common code is C0660 exhaust solenoid fault.
The exhaust soleniod in the rear suspention air compressor and is a common problem for having an open circuit internally.
The solenoid is not serviced seperate, will need an air compressor assembly if this is found to be the problem.

It is the compressor to the shocks. It hapens when the shock has a leak. It's called air ride system. it's very annoying disconnect the power going to the motor behind the driver rear wheel or fix the air leak

Seems like a common problem with these trucks. I thought I was the only one. I just posted this comment for someone who has a 2003.....I'm not an expert and not sure how widespread the warning message can be, but in my personal case: I have a 2001 Yukon Denali.....I have the same problem and have for many months. I took it in a few times and the GMC Dealership finally told me that It's the ride air bags. In my case they are leaking. Its not the same safety airbags in the front dash to prevent injury...but these models have air bags under the truck that automatically adjust to level when weight shift...you might hear the occasional sound coming from the back while driving or when more people are in your Denali. To me it sounds like a power tool. The Service tech told me it's not harful nor will it damage anything, but it costs about $2000 to fix, because they have to replace the whole thing. He said you may notice the sound coming on from the airbags more often because of this..because the system is working harder to adjust the weight due to the leak/loss in air. So occasionally for about a year...the light comes on....but it has done nothing else.

I hope this helps.

On your 2003 yukon denali, the air ride compressor is located on the driver side rear frame rail on the outboard side, near the fuel filler neck and behind the left rear wheel. Hope this helps!

if your engine starts up and dies right away the you probably have a fuel pump problem and the service ride control mean that your air ride compressor has gone bad just turn your key to the on position and wait about 30 seconds you will here buzzing from the left rear wheel area if the compressor is working

That is an indication that your air shocks at the rear needs to be replaced or there is a sensor that may have gone bad, event the air pump mey not be working. Most owners replace the more expensive air shocks with good conventional shocks like Monroe Reflex Shocks if there not towing heavy trailers. You can have the conventional shocks installed and have the ride control system deactivated. First check your fuse just t make sure the fuse to the air compressor has not gone bad, and the air ride leveling sensor, wire harness has not been damaged due to corrosion. 

leaking suspension air bags is the most common cause, but the system can be tested for trouble codes, I suggest u do so, only the dealer can do this, but guessing about what the problem is can get very expensive very fast.

The fuse is called RTD 30 amp under the hoodfuse box. That is for the Air Compressor.

Parts.com has the best price for:

Rear Suspension:
Shock W/auto level control - 1500 series

and under
electrical:
then ride control components
then compressor

it has to do with your air ride suspension best bet is take it to the dealer there is probably a problem with a level sensor. hope this helps you