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Rodric30 4/6/2015

2004 GMC T7500 T7F042 6 Cyl 7.80L


Hi my name is Rodric Friendly and my truck two check engine lights come on when I drive over 65

I changed 3 filters so I'm not sure if it's a fourth one, the oil in the primary fuel filter the air filter and you please help.

1 Answer


Jimm 4/6/2015

The check engine light is located on the dash and stays on if the computerized engine control system detects an engine performance or emissions problem.

First step - have the stored fault codes or check engine light scanned - for free - at any local auto parts store; Advance Auto, Auto Zone, NAPA. Then, post a reply as 'add answer' with the specific code for more assistance. There may be a fault code stored in the OBD memory which may not be displayed as a check engine light.

Do not skip this important first step - there are literally hundreds of possible fault codes. Avoid wasting/ throwing money at the problem.


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