I have a 2011 Chevy Cruze. My car would not go over 50 mph on the highway. The CEL came on the next day and the diagnostic code was P2099. I took it to the Chevy dealer and was told it was the catalytic converter. It cost me $935 to fix it. Seven days later I got a call saying that they replaced the cat, but that didn't fix the problem. They said I would need to replace the rear one as well. Can both go bad at the same time with no symptoms at all? It ran fine prior to all that.
That P2099 trouble code indicates that the powertrain control module (PCM) is malfunctioning. In particular, that code refers to the PCM’s failure to control fuel trims to keep the air/fuel ratio correct. You wasted your money changing the catalytic converter.
Don't trust the mechanic giving you a code. At least look it up before spending any money. That’s why I recommend getting your own diagnostic tool as the one I mentioned in my article. It will save you from making these mistakes.
Updated on February 7, 2020
By Glenn Stok