XC chassis / 300 ISB Cummins Check Eng light??

I would check with Freightliner/Gaffney to see if there is a built in code function (such as blinking lights when certain sequence followed).

If you have a coolant level sensor, that is one of the higher failure rate items.

Mr. GSF,

Seems like everything has a sensor now. I've always wondered too exactly what that noise is when you turn the key to the acc. position. You can hear a clicking under the coach that runs the whole length. (Both of our coaches made the same clicking noise).

You will need to have the codes deciphered to see what the cause of illumination. Could be a sensor somewhere.

Good luck,
MM.