Question about 2004 Chevrolet Silverado 1500 Crew Cab

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02 chevy 2500hd 6.0 ses light flashing at40mph an gose out at 75mph

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The SES light flashing means the engine management software has detected a misfire condition resulting in exceeding 3 times the federal limit of emissions. Under heavy load such as acceleration one or more cylinders are misfiring and once cruising speed is reached the engine is under a lighter load (10 to 20 percent ) that is why it stops flashing several causes of misfires are worn spark plugs ,spark plug wires, faulty ignition coil or coils fuel injector or fuel pressure problems a quick check of the computer to retrieve trouble codes should identify the problem cylinder or cylinders and will direct you in the right direction to find the faulty component but will not tell you exactly what is wrong certain test must be performed to isolate the cause.

Posted on Dec 05, 2012

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  • chris everett Dec 05, 2012

    its is a p0300 code

  • Brian Johnson Dec 05, 2012

    to diagnosis a 300 series code check compression on each cylinder, check for good spark ,good spark plug,good spark plug wire ,good injector electrically and mechanically check for injector pulse and check for power and grounds to the coils and injectors

  • chris everett Dec 05, 2012

    will do thanks

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SOURCE: I have a 2003 Chevy Silverado 2500HD. When I

heated seat eliment needs replaced. or unplog

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SOURCE: 2005 chevy silverado v8, some hesitation, rough

Black smoke could mean it is running rich, have a scan done, it is probably an engine misfire code and it will tell you which cylinder is misfiring. the last digit is the cylinder, unless it says random missfire, It may be time for a good tune up and don't forget the fuel injection system, Clean out the intake and do an induction cleaning on the injectors.

Posted on Aug 16, 2009

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