To reset the check engine light in Your 2012 GMC Terrain vehicle, disconnect the battery cables for 10-15 minutes and then reconnect. The problem can be anything from a momentary hiccup, something like a loose gas cap or a change in humidity, to the failure of a major component like a bad catalytic converter. The list of things that can trigger the check engine light is pretty lengthy. First things first, if the light comes on, You should first check to see if the gas cap is loose. If the gas cap is loose, tighten it and continue driving. Even after tightening, it will take some time for the light to go off.
Lisa J
July 16, 2020
To reset the check engine light in your 2012 gmc terrain vehicle, try disconnecting the battery cables for 10-15 minutes and then reconnecting them, or turn your ignition key to the "on" and then "off" position twice, followed by starting the engine and the light should disappear.
The Questions and Answers on this page are the statements and opinions of their respective authors and not VehicleHistory.com. VehicleHistory.com
does not research or authenticate any of the Answers provided.