It started about two weeks ago, first with the TPS needing to be replaced. So i got the pedal replaced and some of the wiring harnesses replaced by the dealer, then two days after i get it back, eng pwr reduced again. so i took it back to the shop and they said it was my ecm this time, so they replaced it for free. Now its about 4 days later and its doing again. Ive been resetting the battery to get the code to go off so i can still drive it, havent gotten this code read it. Anybody know what it could be? Im tired of putting my car right back in the shop as soon as i get it back.

 

What codes are coming up?

Is it when you hit a certain RPM? Go into boost?

Joel

 

Without getting the code read, we really can't help you, there's a million things that can cause epr

 

its just real random when it comes on, never while im driving, at least this time since ive gotten it "fixed". It will randomly come on when i start it up, and i havent been able to get it read yet cuz i dont have a pocket scan or anything.

i have been driving it around today to try to get it to throw it so i can go get it read, but it only comes on at the most inconvenient times.

Im thinking it may be the TB, only thing i can really think of after everything has been replaced.

 

A clogged cat will give you engine power reduced. What pulley do you have and what is your boost at
wot

 

I had the same problem. Replaced my throttle body and I was good to go.

 

I'm having the same problem as well. Car runs fine if I keep giving it gas every 10 seconds or so but if i just let it idle like normal in about 15 seconds it will go into pwr reduced and run like ****. Turn it off, start it back up and its fine. Went through all the troubleshooting and last option is bad T/B. I have been trying to find a used one, but I think I'm finally gonna break down and get the LS4 with spacer from crateenginedepot.com for $200.

 

Im puttin money on it being your throttle body sounds like what happened to me. Got a throttle body from a buddy of mine and it solved my problem.

 

threw the code again today, turned it off, and 20 min later the code was still on but no eng pwr reduced. went and got the code read and the code was p2135, still think it could be my TB? idk what else it could be if its not my TB.

 

Yeah same code I was getting. Probably the T/B gone bad. Seems to be a common problem, I've come across alot of people who had this same problem while researching a solution. I made a mistake in my previous post, I am getting the LS4 t/b through ZZP not crateenginedepot.com sorry. For $200 its not bad, and alot of the used ones i've been seein on the internet were alittle over a $100 plus shipping, so its not a bad deal, especially when you get the adapter for the price as well.

Cobalt & Ion ---> ZZ Performance

 

That happened to me once and it was just a unplugged sensor from the TB...

 

take it back and let them figure it out
/profit

 

TB. Had the same code. got the used one from my buddy and it solved the problem