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There are 4 DTCs that tell you to either replace or reprogram the Suspension Control Module and then 8 DTCs for the actuators and the ride height sensors. It would be helpful if you could tell which DTC it is. If any of the DTCs are present you should get the DIC message "SERVICE SUSPENSION SYSTEM"
An Opel or Vauxhall dealer could read the DTCs but they would have to load Chevrolet onto their scan tool (laptop) and they may not be able to do that. I forget how it works for dealers. But they have the correct equipment and program. There are just different downloads for different purposes. They would also have a similar ability to program the suspension module.
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