I’ve got a 2007 Chevy Cobalt Ls 2.2 I4, I’ve got the trouble code “P2135 Throttle Position Sensors Not Plausible”. It will drive a mile or two down the road and will trigger “Engine Power Reduced” and it will drive dangerously slow. I’ve replaced the throttle body which has the throttle position sensor on it and to no avail it still kicks it into “Engine Power Reduced”. I can unplug and reconnect my battery or clear the codes and can get by for slightly longer (5-25 miles) but will come right back. Help!
This is what happens when you throw parts at a problem without testing and verifying.
The meaning of the code is:
"P2135 throttle/pedal position sensor/switch A/B voltage correlation"
That means
A) the throttle is not doing what the pedal tells it to do, or
B) the pedal is giving nonsense.
Did you do a relearn procedure after replacing the throttle body? Did you measure the pedal sensor to see if it was malfunctioning?
More info @ https://www.obd-codes.com/p2135
I did do the relearn process. Is there a good way to test the pedal sensor?
Google my friend. Great tool. First result:
https://easyautodiagnostics.com/gm/4.8L-5.3L-6.0L/app-sensor-diagnostic-tests-1
Okay, will do. Shouldn't it have read the codes for the pedal sensor instead of the throttle body if the pedal sensor could be bad?
It's not always that simple. The computer's main job isn't to tell you "hey lunkhead sensor X is broken". It's job is to crunch a lot of numbers, really fast, to keep the engine running. When it runs into numbers that don't make sense, it tries to narrow down the problem the best it can. In this case it's saying, If switch A is doing this, then switch B shouldn't be doing that, or the throttle should not be doing that. And that's all it can say with the information it has. The computer just sees sensors as numbers. It doesn't know what those number mean. it's up to you to do the rest.
Short story long, code P2135 is an electronic throttle control error. The pedal is part of that system. It's not for any particular sensor.