Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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The odometer runs off of what the speedometer says.If your gauge/speedometer is off or an internal electrical fault in the instrument cluster this will cause higher mileage readings.A failing vehicle speed sensor can also cause this but you would see a check engine light and traction or abs lights on the dash if this was the cause as the vehicle speed sensor data wouldn't match the wheel speed sensor data.
I havent seen this as an issue on this model here but it is possible the instrument cluster has a fault internally needing repaired or replaced.I would have this checked over under warranty at a GM dealer to see if this needs repaired or replaced.They will have to check the speedometer signal against another vehicle to see if it matches as well as make sure the odometer is registering properly for every mile driven.If a fault is found they will correct it at no charge to you.
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