My 2007 Ram 4.7L has the code P0122. I have tried to reset code but it keeps bogging down. Initially the code came on and the rpms would bounce between 1800 and 2500. The truck shifted hard if it shifted at all. I replaced the TPS and cleaned the air control valve and throttle body (originally I replaced the AIC, but surprise, surprise it was defective and could be blown through right out of the box). Started the truck after replacing/cleaning everything and idle is now at about 800 rpms but when I press the accelerator the truck goes to 2500 rpms, sputters, and then bogs down. Even if I press petal to the floor it won't go above 2900 rpms, but it will bounce back and forth between 2500 and 2900 rpms. Code for P0122 has yet to go away and is the only code present. Any ideas? ***** UPDATE **** So it was suggested to test the electrical circuits. After testing I had 3.5v at the connector before being plugged in at the signal wire. Once plugged in the voltage went down to .82v (which was ok). So installed turned throttle and everything went up smoothly to roughly 4.52v. Slowly released throttle and everything went down. Started truck everything the same as before. It idled at 800 rpms and would not go above 2500 rpms. Plugged in scanner and found that even though tack was reading 2500 pcm was only reading 1300 rpms. I removed the New TPS from the truck and found that the spring inside the sensor was broken. Currently in process of getting my hands on yet another TPS.
Test for shorted electrical wiring or open .
https://www.autocodes.com/p0122_dodge.html
SOURCE: no acceleration
I had the same problem with one exception. It would rev higher than 3500 but the higher it revved the more it bogged. I had the catalytic converter replaced. I thought I bought a new car. Acceleration is just like new. It was easy enough to test. My mechanic cut a hole in the exhaust pipe in front of the catalytic converter. It sounded like a truck but the acceleration difference was immediate. Easy diagnosis.
The car is hard to shift because the more you press on the accelerator the more the computer for the transmission won't let it shift. Which in turn causes the car to bog more sending more unburned fuel into the catalytic converter. Which in turn causes more carbon build up and more back pressure. Vicious cycle. It will only get worse.
My thermostat caused the entire problem. Thermostat was stuck open, engine never got to operating temp most days. Car burned rich. Bad gas mileage. A lot of unspent fuel being dumped into the converter. Probably have some underlying cause that needs to be addressed. Bad plugs, wires, coil, fuel filter.
SOURCE: 2003 Lincoln Navigator error code
Please check voltage at the crank sensor with key turned on. Should be at least 4.5 volts. Also check tone ring at sensor. rotate engine to observe all teeth. There should be one tooth missing and no chipped teeth, debris, or other issue that could corrupt the signal. Backprobe the signal wire and measure the signal with your voltmeter set to AC. The AC voltage should increase with engine RPM.
Sorry, but I cannot find the wiring diagram for the crank sensor. If possible and especially if the reference voltage at the sensor connector is wrong, trace the sensor wires back to the PCM to see if there is an open or short in the wiring. Please let me know what you find out.
SOURCE: 1999 Dodge Ram 1500 - Cranks fine, idles good, but
For one you can't time that vehicle it's all controlled by the PCM, I have the same issue currently, changed all ignition and sensors, I am now checking for faulty PCM ground wires, fuel pump (it has no fuel filter, great dodge idea lol) and last resort will be check for clogged catalytic. I will post the answer when I find it, don't listen to all the generic answers for this particular issue, it's something very off the wall for sure
P0232....Fuel Pump Secondary Circuit High
P0230....Fuel Pump Primary Circuit
P0215....Engine Shutoff Solenoid
P0122....Throttle/Pedal Position Sensor/Switch A Circuit Low Input
P0522....Engine Oil Pressure Sensor/Switch Low Voltage
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