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2013 Chevrolet Suburban
Platform: GMT 400, 800, 900

Check Engine Light on constant but flashes above 25mpg

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Old December 15th, 2012, 7:57 PM
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Default Check Engine Light on constant but flashes above 25mpg
While I am idling the service engine light stays on. Once I speed up to 25-30 mph and faster it flashes. Also the car started to run rough when this started.


it just came back from an auto body shop so i have no idea what they did to it.
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Old December 15th, 2012, 8:02 PM
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the car is misfiring. The flashing light is a warning not to drive it or the catalytic convertors will be damaged.

Get the misfire fixed asap.
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