2003 2500hd 6.0
 

Im having the Reduced Engine Power. I have been researching and have checked wiring, cleaned carbon from throttle body and all the obvious. My new question is I ran across a forum that suggested my cooling sensor. I have an idea that could cause this. My truck idles in my driveway and operates fine for almost exactly 30 minutes then it comes back on. I try something else.....restart it and in 30 minutes it acts up again. THOUGHTS?!?!?

post the code that is setting.
link the forum article.
imo most reduced engine power faults are caused by throttle actuator or accelerator pedal position sensor faults.

I have not had a code read yet, will not run long enough to get it someplace, but soon as I do I will post it. I am new to posting here so what do you mean by link the forum article? Thank You for the reply!!

you were referencing a forum that said the fault was a coolant sensor...post the web address so i can read the forum article to see if it is relevant.