2002 GMC C2500 eng.light

2002 GMC C2500
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K HAMMERLE
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Electrical problem
2002 GMC C2500 V8 Four Wheel Drive Automatic

Why does the service eng light come on at 45-65 mph.Goes out when off hyway ?
Feb 21, 2010 at 9:48 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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