I bought a 2012 Chevy Cruze LS with 164000 miles, in an auction. It came with few problems, the obd codes listed below. I am trying to fix the easiest of these first the throttle body sensor ( No acceleration whatsoever). I replaced the throttle pedal as suggested by google search, cleared the codes, but no luck. Still no acceleration and p2122 code came back. Does anyone know what else could be a problem and way to fix it.

P2122 throttle body sensor
P00b4 coolant temperature thermostat sensor
P0452 fuel tank pressure sensor
P0463 fuel level sensor
P0597 thermostat

 

those aren't the entire codes. Trouble codes aren't just names of sensors, or recipes for the parts gun. They usually report a detected condition in a circuit. (low, high, etc.). A circuit isn't just a sensor. A circuit usually comprises of a sensor, the wiring harness, a computer and a power source. A failure in any of these components can lead to a triggered fault. Go through the step by step troubleshooting on obd-codes.com for each of these. Sensors don't go out that often. More often it's a janky connector or wiring, bad grounds, etc. Circuit schematics are pretty much required to troubleshoot electronics so try to find some of those.

 

Thank you @mountainmanjoe I did tried to look at the throttle pedal wiring harness and connection and found no issues so far. The obd code p2122 said Accelerator pedal position sensor/switch D - low input. From my research, the most common cause would be worn out throttle pedal and thought it would be easy to replace it. on further investigation, I connected to collect live data and seems to me the pedal is working fine, when I depress the pedal it does increase the Switch D position percentage, please see the image below for referrence. However I observe other abnormalities, the pedal position percentage itself fluctuating both in depressed and idle position. The Throttle position has no change co-relating to pedal position and it by itself fluctuating as well irrespective of the pedal position. I am guessing now that it might be a throttle body position sensor/wiring problem instead of pedal position sensor/wiring, am I guessing right? if so is there a chance the ECM throws P2122 even though its throttle body sensor problem.

throttle pedal idle position

throttle pedal depressed

 

in a throttle by wire system, the computer controls the throttle, so it will make continuous small adjustments to maintain a target RPM, even if your pedal position doesn't change. It's only changing by fractions of a percent.

But your pedal position values are bouncing a lot. I'm pretty sure these sensors are simply potentiometers ,so they should produce a smooth voltage output.
I'm not sure how much yours cost or what the availability is, but there are videos of people opening them up and cleaning off the contact surfaces.