torres-ss

Had the same problem you experienced man. I don't know if I can help but here's what I learned from my balt.

p0069 = manifold absolute pressure sensor
p0121= throttle body position sensor
p1101= voltage correlation throttle position sensor (the one in your foot pedal assembly)

When Chevrolet built our cars, they included 2 tps sensors to monitor engine performance. also it acts as a back up in case one fails. The issue with you going into limp (if you are already tuned, and yes this happens to me often) is not based on your tune, nor do I believe it is an airleak.

I experience "red engine power" on days when the weather gets really really cold very quickly. It even happened to me on spring break. The atmospheric pressure sensor (which is located as a plug at the top of the supercharger) is what I DISCONNECT, WAIT 10 Secs and then RECONNECT and it always solves my problem with limp mode. Computer will clear itself after a few start ups.

I wouldn't worry too much about it. It is a pain in the ass, but I would check to see if you have any leaks or anything affecting your wiring from the tps sensor or check to see if your pcm is still good. I was the victim of buying a lemon SS and now it has turned out to be a terrific car. Hope this helps. Don't go out and buy a new engine or pay for someone to throw a bunch of parts on your car. This happens often and you just need to know the trick to diagnose your limp mode without wasting your money.

blue05ss/sc

So what fixed your problem buying a new pcm?......where is the second tps located i was told it was built in the throttle body

BlackCobaltsssc

So do I disconnect map sensor while running or off?

DC4LIFE

Or just take it into chevy they will figure it out and fix it.

Red05SS/SC

iTrader: (2)

The barometric pressure sensor is located by the end of the fuel rails not on top of the supercharger. The sensor on top of the supercharger measures airflow. It's used to protect from problems like toyota was having with the engines "running away". The computer will run a test every once in a while to make sure the airflow before and after the throttle body is correct. Use a can of carb cleaner and spray around the throttle body, the sensor on top of the supercharger and all a long your intake. If you have a leak of somewhat the engine rpm will bounce around. If you don't find any vacuum leaks you need to see if the sensor on top of the supercharger is working properly. You can tune that sensor out and it won't run the tests anymore but you do run the risk if something goes wrong with your throttle body of having the car run away on you.

blue05ss/sc

Been there tryed that.......didnt work they said it was the throttle body changed that and all i get are idk's from the dealerships

CobaltArmyDude

im having the same issue.. codes are p0068 and p2228. replaced my map and MAF sensors.. checked wires and fuses, and took off my TB gave it a good cleaning.. still having issues and its getting frustrating

shadowfaxss

iTrader: (3)

I suppose you don't have access to a scan tool, HPT, or an Interceptor? You're really going to need to to look at some parameters.

CobaltArmyDude

i have interceptor gauge if thats what you mean

shadowfaxss

iTrader: (3)

yes.....some of the diagnostic trees are pretty lengthy