Suspension error code C0590

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al2fast

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I have an iCarsoft i900 scan tool and I'm getting a C0590 Right Rear Solenoid Circuit Malfunction DTC Status: Open error code. The service suspension message comes up on the DIC when I start the truck.

I have an 09 Yukon Denali. Can anyone tell me if this solenoid is in the shock itself or if it's located in the compressor assembly? I replaced the compressor with an Arnott almost 2 years ago. Just trying to figure out what to do to correct. Thanks.
 

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