(2006 cobalt s/c ) When I was getting on the freeway today I gave it a full throttle. A few seconds later my car lost power and I read power engine reduced. What does mean? Now my car won't go pass 50mph, and it stalls in the city with a weird rattling noise.

 

Check ur cel lights, it could be anything that put it
Limp mode.

 

The rattling is what I'd be worried about. Limp mode could be something simple. Is the rattle coming from the engine itself or just something in the engine bay?

 

augievelas,

Just wanted to chip in what I could: the Engine Power Reduced message informs you that the vehicle has reduced engine power to avoid damaging the engine. I unfortunately don't have any information behind what would trigger the vehicle to do this to share with you.

Were you planning on getting this looked into? I'm here to assist in whatever way I can!

Sarah
GM Customer Service

 

Have you had any work done to the car in the past week or so. After I had my clutch and flywheel changed my car went into limp mode and all I did was disconnect the neg battery cable for about 30 minutes then plug it back in. After that I haven't seen the message again.

 

IIRC limp mode is usually caused by a whole ass load of knock occuring in a short period of time. Did you recently fill up with some bad gas? Have you done anything that would adversely affect your AFR?

 

same thing happened to me a while ago i got some PM's from a few people on the forum and actually found a fix. Ill forward you the convo's we had and see if you can diagnose it like i did.

 

that is only one of a bunch of things that will cause limp mode and knock is not the main one

 

U should post that in this thread too man

i got limp mode one time when i started my car after cleaning the throttle body. whole engine was shaking teribly the exhaust was sputtering... so i turned it off. unplug/replug batery cable and tried again. no issues. wierd

 

Check ur intake sensor , if its come out of the hole, unplugged or becomes damaged this will happen. Happened to my 06ss.