2004 gmc envoy_slt
Hi All... I have an intermittent problem with my 04 Envoy L6. Every so often, when I'm driving my SES light blinks one time, very quickly, like the blink of an eye. Several theories have been presented to me, one of which is a malfunctioning crankshaft sensor. The questions are: 1) Can I do this myself without the need for dealer flash programming or does it need to be done by a dealer? 2) Does anyone else know of anything else that might cause this?