Hi,
I have a 2011 Malibu LS with a 2.4l ecotec engine. I was driving a short distance and the check engine light came on and the car lost alot of power. Wouldnt go past 10mph. I limped it home and hooked up my code reader and it had a "P2135 Throttle Position Sensor 1-2 Not Plausible error". I looked it up on the internet and it pointed to the Throttle Position Sensor. Looked up the part and I found out that the throttle body had to be replaced due to the fact that the sensor is part ot that. Cant just buy the sensor. I replaced the throttle body and tried to do the "Re-Learn" steps. Which are idle the car for 3 mins, shut off for 60 seconds, and than idle again for 3 minutes. I did tihs and the car now runs up to speed but the RPM's are flukey. WHen first start it revs up to about 3k RPM's and than settles down to about 8-900 Rpm's once I put it in gear. But when I'm driving the RPM's go up and down between 1K and 2K. The gas mileage seems to be a little worse also. Is there anything else I can do tho it to reset the RPM's back to normal? I've put almost 200 miles on it since I replaced the throttle body.

Thanks in advance!

Chris...

 

This problem has been fixed. It took about 250 miles until it "smoothed" out. Runs good now.