When my cooling fan kicks on so does the check engine light.. when the fan goes off so does the light. Anyone have any ideas of what the problem could be? let me know thanks

 

For a precise answer, you need to provide info about your car - year, model, engine, trans and major mods. The "Signature" field is useful for that purpose.

Its not the fans turning on the check engine light - its the other way around. In many cases when a trouble code sets, the PCM turns on the fans to protect the engine. You need to scan the PCM to determine the trouble code that is being set.

 

sorry about that.. its a 95 z28 camaro. how do you check the codes if the light is not on unless the car is running and the fan is on?

 

You will need either a code reader, a scan tool, or pc software to pull the codes. The '95 is different in that it is OBDI, but has an OBDII connector port. That fools a lot of people, including some at garages. No matter what you decide to use, it has to be OBDI capable, with the proper cable. An OBDII cable will not work.

The PCM should have stored the codes.