P0122 - How To Repair: Meaning, Causes, Symptoms, Fixes

P0122 - OBD2 Trouble Code Throttle/Pedal Position Sensor/Switch Circuit Low

Identical faults

The following faults are identical to P0122. For these, you can follow the information on this page:

P0123 – Throttle/Pedal Position Sensor/Switch “A” Circuit High

P0122 Code Definition

Throttle/Pedal Position Sensor/Switch “A” Circuit Low

What Does the Engine Code P0122 Mean?

Character "P" in the first position of Diagnostic Trouble Code (DTC) represents the powertrain system (engine and transmission), "0" in the second position means that this is a generic OBD-II (OBD2) DTC. "1" in the third character position in a DTC indicates that the fuel and air metering and auxiliary emission controls is experiencing a malfunction. The last two characters "22" is DTC number. OBD2 Diagnostic Trouble Code P0122 means that Throttle/Pedal Position Sensor/Switch Circuit Low has been detected.

Carly's expert mechanics have identified the following related fault codes. With the information for these fault codes it is often possible to identify and better repair your faulty part/system:


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    What Is the Cause of P0122?

    There can be several damages/failures causing the underlying problem of the OBD2 DTC P0122. To find the root cause of P0122, unlock the “Smart Mechanic" feature in the Carly app.

    What Are the Symptoms of the Code P0122?

    Symptoms of this error

      Engine jerks or stutters

      Poor throttle response of the engine/bad acceleration

      Increased fuel consumption

      Possibly the engine also starts worse

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    How much does it cost to diagnose P0122?

    Visiting a car repair shop and letting them perform a diagnostics check can cost you $60-$100. For almost the same price you can get Carly. Its advanced features can cover what a professional automotive scanner that costs over $3,000 would, and more!

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    How To Diagnose and Clear the Code P0122?

    Performing a diagnostics check with a diagnostic scanner helps you identify a particular problem area that is outside the normal range and shows where a fault might be occurring. This helps you to detect errors before they cause more damage to your vehicle. In comparison to generic OBD devices that only provide OBD-level engine-related data, Carly can run advanced manufacturer-level diagnostics, check all your ECUs in your car (like ABS, airbag, multimedia) and get deeper insights. You can find additional information about the trouble code and understand the severity of the problem. With the new Smart Mechanic feature, you get additional professional insights and tips from expert mechanics. You are able to check components and their mechanics, find detailed repair tips, and learn about potential future damage. After you have fixed the problem you can easily clear the fault codes with Carly, too. Also, the diagnostic results are safely stored inside the app or as convenient PDF reports you can share with your friends or a mechanic.

    Common Mistakes when diagnosing the P0122 code

    The most common mistake is to look and try to fix each individual OBD2 (OBD-II) code without having a holistic understanding and approach. Understanding the interrelationship of different systems is crucial to determining the root cause of the problem and finding the right solution. The new Carly Smart Mechanic feature provides a look at the whole system, not just one individual code. Enable Smart Mechanic in your Carly app and get a holistic solution-focused approach when diagnosing the code P0122.

    How Serious Is the Code P0122?

    For now, this issue is not serious. Carly recommends you to check this issue on a regular basis and check if it gets worse later on.

    How to fix the P0122 Code

    P0122 is a generic fault code but the repair steps may vary depending on the root cause and the make/model of your vehicle. Get the Smart Mechanic in your Carly app to learn more and receive guidance.

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    Estimated Cost of Repair for the P0122 Code

    The cost very much depends on the root cause of the issue. To find more information about causes, possible solutions, and potential repair costs, unlock “Smart Mechanic" content on the Carly app.

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    Learn more about the P0122 Code

    Task/Function Throttlebody/Throttlebody potentiometer

    The throttle valve has the task of regulating the air-fuel mixture for the internal combustion engine. Depending on the propulsion concept (gasoline or diesel engine) the according purpose applies. In gasoline engines, the speed and power output is regulated by the dosage of the mixture control. Diesel engines basically do not need a throttle valve at all. In modern diesel engines, throttling the amount of air drawn in provides precise control of exhaust gas recirculation (EGR) and prevents the engine from shaking when it is switched off. In the case of electronic throttle valves (which is the case in most modern vehicles), there is no direct connection to the accelerator pedal. There is a sensor on the accelerator pedal (e-gas) which sends a signal to the engine control unit. The engine control unit then sends a command to the throttle valve whenever its needed. This includes the angle how far it should open. The engine control unit constantly compares this signal with all other available data (setpoint and actual values) from the engine sensors. This is used to calculate the optimum throttle position. The electronic throttle valve is controlled exclusively by a servomotor. The so-called "throttle potentiometer" is used to determine how far the throttle valve is open. The information obtained from this is transmitted to the control unit and contributes as a parameter to the calculation of the required fuel quantity. The potentiometer is attached directly to the adjustment of the throttle valve.

    *Every car is unique. The Carly Features that your car supports depend on the model, build year, hardware, and software in the car. Plug the scanner in the OBD2 port, connect to the app, run your first diagnostics, and check which features are available for your car. Also, keep in mind that any information provided on this website is for informational purposes only and should be used at your own risk. Mycarly.com is not responsible for any errors or omissions, or for the results stemming from the use of this information.

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