2003 GMC Yukon V8 All Wheel Drive Automatic 117000 miles
yes my denali is saying service ride control on the dash. I dont think the air compressor is coming on. I have checked the fuse and it is good. Could there be a faulty relay? Is this a comman problem with these denalis? If relay, where is it located.
The automatic level control (ALC) compressor relay is near under hood fuse block.
If the relay is not the problem, the system will need to be diagnosed.
Check power at the compressor when relay is energized.
If there is power, the problem might be in the motor.
If there is no power, check for open between the relay and the motor.(red wire)
If there is no continuity, replace the wire. If there continuity, the relay is bad.