Review Of Gmc Check Engine Light Flashing References. And if you gmc is going in for emissions inspection, a lit check engine light always results in an automatic failure of the test. Web #1 · nov 29, 2019 my check engine light has been coming on and flashing.
This happens because the engine detects a leak in the evaporative emissions system, which exists when the gas cap isn’t tightened until it clicks. Web a loose gas cap is often the reason the check engine light turns on. Web if you have a flashing or blinking check engine light, continuing to drive the gmc can potentially cause further damage, and may result in costly repairs.
