99 international 8100

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by jeffl0123, Dec 19, 2021.

  1. jeffl0123

    jeffl0123 Light Load Member

    60
    14
    Jan 18, 2018
    0
    Hey guys,
    Have a 99 international 8100. Can you tell me how to use the diagnostic switch on the truck. I truck holding it on with key on and then holding it on while turning key on and neither does anything. Thanks
     
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  3. Old dirty trucker

    Old dirty trucker Bobtail Member

    41
    47
    Oct 24, 2021
    0
    Mine u just turn the key but don’t start it, wait a second and hit the switch. It should give you a flash code. Mine is a Detroit (96)
     
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