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homemade87 · 09-15-2017, 08:22 AM

Gm set the mill light to flash when things need immediate attention . Like a dead cylinder . Not just a miss fire . There are other codes for that and if the mill light is steady on there is a problem and needs to be looked at soon but not urgent .

My 06 did this and turned out to be a bad plug wire had burned in the boot and made that cylinder dead and I had a flashing light continuous .

Your problem is intermittent and will make it harder to find . Could be plug wire or a coil , or even a injector . You may have to get someone with a tech2 and plug up and go for a ride to see what is going on since it is only happening when you are driving . This could tell you what cylinder is .

If you are still running original wires its time for new ones anyway . I would start there .

09-15-2017, 08:22 AM	#4
homemade87 Registered User Join Date: Apr 2010 Location: Guntersville Alabama Posts: 1,073	Re: flashing check engine light Gm set the mill light to flash when things need immediate attention . Like a dead cylinder . Not just a miss fire . There are other codes for that and if the mill light is steady on there is a problem and needs to be looked at soon but not urgent . My 06 did this and turned out to be a bad plug wire had burned in the boot and made that cylinder dead and I had a flashing light continuous . Your problem is intermittent and will make it harder to find . Could be plug wire or a coil , or even a injector . You may have to get someone with a tech2 and plug up and go for a ride to see what is going on since it is only happening when you are driving . This could tell you what cylinder is . If you are still running original wires its time for new ones anyway . I would start there .