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Home > Diesel University > Diagnostic Trouble Codes
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Dodge Chevy/gm Ford
So many times we have customers that call in with "my truck has a code in it". As technicians, this is a pretty vague statement. There are several things as technicians we can do to help customers when they call with a CEL light illuminated on the dash.

Being able to get a definition of a CEL light is fairly easy. If you have a 1994 or newer Dodge if you use the key off-on cycle three times the code number will pop up in the odometer, or in the diagnostic center, or on some of the early models there will be a flashing CEL light once you cycle the key three times. On Fords and Chevrolets this is not possible. So if the customer has a CEL light on these trucks and they do not have a programmer or scan tool that is able to pull codes, then what they can do is visit a local auto parts store. Most auto parts stores will hook up to the OBD 2 port and will retrieve the codes for you for no charge.

Once you have retrieved your code and noted it, then we suggest to clear the code and see if it returns. If it does, then it is a constant failure and not an intermittent one.

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