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I recently purchased a brand new 2023 GMC Sierra duramax diesel <br /> it has only 4200 miles on it and it has been at the dealer service department 2 times due to errors with rear parking sensors and the biggest issue is the check engine light comes ON.<br /> brought to dealer and they don't know what the issue is. according to the diagnosis from GMC APP is a emission problem but dealer states they cant figured out issue because is history codes when they run the diagnosis on it. this is so frustrating 62k+ truck and has issue service department cant figured out. GMC corporate hope you see this since non one is willing to help me with issue.


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