+18 2003 Chevy 2500Hd Check Engine Light Flashing References. Posted on feb 02, 2010 The ecm, or called the computor, moniters the cuircuit for the motor.
Could have bad plugs and wires.bad fuel injector.clogged fuel filter.water in gas fuel contaminated. Web get the truck check by a pro to see why the light is on. Web 2003 chevy 2500hd 6.0l engine light flashes over 60 mph, codes says multi cylinder misfire.
