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OBD does not connect to truck so I can access codes. Service engine light is on. I have tried two different scanners neither would connect. Is there a fuse?

Vehicle: 2004 Chevy Silverado Z71 5.3V8 auto 4x4 Ls ext cab 125,000 miles

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Yes there is it is in the engine fuse box, this is also the cigarette lighter fuse which also powers pin 16 of the DLC(diagnostic link connector) connection,when this fuse blow open it usually caused by overloading the cigarette fuse of accesories such as cell phones Ipods,and other neat toys, It is fuse number 30 which is a 15 amp fuse

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Reynaldo, Thanks for the answer. That was exactly what was wrong.

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