Question about 2003 Chevrolet Silverado 2500HD

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Check engine light flashing at 65 mph 2003 silverado 200HD

Check engine light flashes at 65 mph then stops when I slow down to just below 60 and then stays off until after 5 minutes of driving at 65 again. any ideas to what I should be looking at. Truck has 93,000 miles on it

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Posted on Jan 02, 2017

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  • 1779 Answers

SOURCE: Chevy truck running rough 150,000 miles

Find out why the engine light is coming on, it is the info u probably need to fix the running rough problem. Most auto parts stores will read the codes stored in your trucks computer for free, write them down, and ask what they mean and how to correct the problem. If u need more info, return to this site w/ codes for further help.

Posted on Dec 30, 2008

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  • 1 Answer

SOURCE: 2003 Silverado rough idle, idles good after "check engine" light

Check your o2 sensor voltage, those trucks are real bad for o2 sensors, and yes if one sensor is reading 0mv, the others will start to drop out, and the vehicle will run very, rough. You also may check fuel system pressure, should be almost 60p.s.i. If its alot lower, Id be looking into a fuel pump. If that vehicle is drive-by-wire (no throttle cable), the throttle bodies get very dirty and cause that concern also. Id start by having the vehicle scantested.

Posted on Feb 07, 2009

  • 131 Answers

SOURCE: '99 chevy Silverado Z71,5.3 engine.....will not rev when hot.....

try replacing your EGR Valve, or your Oxygen Sensor

Posted on Feb 10, 2009

SOURCE: 91 Chevy Silverado stalls

it sounds like the fuel pump

Posted on Jan 07, 2010

  • 7353 Answers

SOURCE: Truck check engine light flashing on and off,

Flashing is BAD, that means its running/ misfiring enough to damage the catalytic converter. Have it checked by a repair shop ASAP.

Posted on Jan 23, 2010

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