Incredible 2016 Gmc Yukon Check Engine Light Flashing References. A flashing light reveals that the problem is remarkably serious and if not taken care of immediately may result in major and significant damage to the car. Web 1 check engine light on problem.
I have changed out the spark plugs and wires, also the ignition coil. Web for the second time this week i start my car in the morning and immediately it has a rough idle, the check engine light is flashing and the traction control light is steady on. I did a scan of the vehicle and the code i got was p0303 which is for a cylinder 3 misfire.
