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Error Code P2122 – Throttle Position Sensor D

Embarrassed? He does not know what to do. Don’t worry, here’s everything you need to know about the error code P2122. When the P2122 error code is stored, it indicates a low voltage that has been identified by the TPS.

This detection often leads to a forced engine stop, forced idling, or forced power reduction to prevent overloading of the circuits, depending on the condition. make model vehicle.


The list of potential causes That trigger a P2122 error code includes faulty – the throttle position sensor, the throttle actuator control motor, the throttle position actuator, or the pedal position sensor.

Damaged cables, connectors, or grounds should be suspected if all four components can be seen to be functioning properly.

Learn more about OBD error code P2122

Well, the opening of the throttle valve is regulated by the electronic throttle control system. (ETCS).

It can be seen that each time the driver presses the accelerator pedal, the installed accelerator pedal position (APP) sensor transfers a signal to the engine control module (PCM) telling the PCM how much power the driver is requesting from the engine. .

Read: Error Code P0411 – What Does It Mean and How to Fix It?

So accordingly, the PCM commands the throttle plate to open. When the PCM registers that the APP sensor does not change as required when the accelerator pedal is depressed or released, it sets the code P2122.

Additionally, the PCM can put the engine in “clean home mode” thus limiting the power supplied by the engine to avoid unnecessary accelerations.

What causes this problem with the Low Input Throttle Position Sensor D Circuit?

  • A damaged throttle position sensor
  • A faulty throttle actuator control motor
  • A malfunction of the throttle position actuator
  • A stuck or unusable throttle position sensor
  • Faulty wiring, connectors, or ground

Replace/repair these parts to resolve the P2122 code

  • Throttle position actuator connector – Are you facing error code P2122? A substandard throttle position actuator connector can always be dangerous to the system, it is also one of the primary causes behind the occurrence of error code P2122. It causes problems such as the inability to shift gears and decreased fuel economy.
  • switch circuit – A malfunctioning switch circuit can always be problematic. Problems such as battery drain and loss of voltage are likely to follow a faulty switch circuit.
  • Intake manifold tuning valve – A damaged intake manifold tuning valve can end up being the main host that invites the P2122 error code.

In addition to the error code, it also invites the problems of poor engine performance, weak acceleration and engine stalls. So replacing one can be one of the wisest decisions to avoid a problematic system.

  • Powertrain control module – Numerous unexplained symptoms are likely to be experienced as soon as the PCM is damaged. The powertrain control module allows the system and transmission to work together. Therefore, a defective PCM can affect not only some parts but the operation of the entire system.
  • Accelerator pedal position sensor – The accelerator pedal position sensor essentially tells the engine how fast or slow to drive when the accelerator pedal is depressed. If it is defective, it can definitely lead to a higher risk of accidents.
  • engine control module – A no-start condition, engine stalling, and engine performance problems are likely after a bad engine control module.

Symptoms of OBD error code P2122

It is vital to know the symptoms of a problem, as only then will you be able to solve the problem. That is why we have listed here some of the main symptoms of OBD code P2122:

Common symptoms

  • First, the driver may notice an illuminated check engine light
  • Black smoke comes out when the engine starts
  • Strong acceleration
  • Sometimes misfires
  • Difficulty starting or a no-start condition
  • The engine stalls

How to Fix Throttle Position Sensor Problem P2122 Circuit D Low Input

Do you want to correct the P2122 fault code? Read the points mentioned below:

  • Now that you have seen and identified the error code P2122, we advise you to perform certain steps using a specialized scan tool
  • Replace or repair a faulty ground wire
  • Replace or repair damaged wiring and/or connectors in the CAN bus harness or throttle actuator motor
  • Replace or repair the throttle position sensor, throttle actuator control motor, throttle position actuator or pedal position sensor as required

Easy Diagnosis of Engine Error OBD Code P2122

It is essential to diagnose this error code. Here are some steps a mechanic should follow to diagnose the problem that triggered a code P2122 to be stored:

  • To diagnose, it is first essential to confirm its presence. With the help of a certified mechanic, a scan tool should be used to collect data regarding the vehicle’s performance and its anomalies in the form of OBD-II trouble codes.
  • Now that the mechanic has scanned and the P2122 code has been recorded, you must proceed to the tests and inspections that are essential to limit the possible causes.
  • Next, a thorough visual inspection of all connectors and wiring should be performed. All defective connectors or cables must be replaced immediately.
  • Next, the code must be erased from the computer’s memory using the scan tool. If the P2122 code does not appear again, the problem is likely resolved. Conversely, if the code reappears, additional diagnostic steps must be performed.
  • The mechanic should check the voltage readings across the throttle position sensor, throttle actuator control motor, throttle position actuator, and pedal position sensor using a digital voltage gauge. volts/ohms.
  • This will help determine if any of these components mentioned above are responsible for the low voltage reading. If necessary, they must be replaced. The voltage must be checked across the wiring, grounds and CAN bus network. Repair or replace all worn parts immediately.

Now that all repairs have been made, it is advisable to delete the OBD-II fault codes. Rescan the anomalies. And finally, the vehicle should be tested to ensure that the codes have been addressed accurately.

Common errors when diagnosing the P2122 code

Here we have listed some common mistakes that need to be avoided to clear the P2122 code:

  • Codes must be treated in the order of appearance (when multiple codes are registered)
  • Failure to confirm the existence of error code P2122
  • After repairs have been carried out, an unsuccessful attempt to clear the error code from the on-board computer

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If you want to know other articles similar to Error Code P2122 – Throttle Position Sensor D Circuit Low Input you can visit the category Fault Codes.


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