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Subjects>Auto>Commercial Vehicles

What causes a emissions light to come on in a 2012 GMC Terrian?

Anonymous

∙ 7y ago

Updated: 9/27/2023

It is on because the ECU has detected a problem with the emissions system on the vehicle. A scan of the ECU with an OBD2 scanner will tell you where to start looking for the problem.

Wiki User

∙ 7y ago

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