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P0124 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


The problem codes serve as critical indicators of potential problems in the vehicle’s computer system, within the automotive diagnostics industry. The P0124 DTC (Diagnostic Trouble Code) is one such code that relates to the Throttle/Pedal Position Sensor/Switch “A” Circuit Intermittent. It is essential that you understand the meaning and consequences of P0124 in order for your car’s performance to be maintained and all underlying issues detected effectively.


In particular, the P0124 code indicates that the Throttle and pedal position sensor or the Switch “A” circuit has an intermittent fault. The Throttle/Pedal Position Sensor (TPS) is responsible for monitoring the position of the throttle pedal and relaying this data to the Engine Control Module (ECM). This information is used by the electronic control unit to regulate engine power and throttle response.


The P0124 error code may be caused by a number of things:

  • A defective throttle/pedal position sensor (TPS) may malfunction and cause sporadic signal problems.
  • Wire Issues: Intermittent signal disruptions might be brought on by corroded or damaged wire that connects the TPS and the ECM.
  • Connector Problems: Corroded or loose connectors might prevent the TPS and ECM from speaking to one another.
  • TPS Calibration: Intermittent readings may be caused by incorrect TPS calibration or misalignment.
  • ECM Malfunction: The P0124 error code can occasionally be caused by the Engine Control Module itself.


You may notice a number of symptoms when the P0124 code is activated that point to possible problems with your car:

  • Illuminated Check Engine Light: The most apparent sign of a trouble code, the check engine light is activated.
  • Reduced Engine Performance: The engine may respond sluggishly to throttle inputs or exhibit hesitation during acceleration.
  • Poor Throttle Response: The vehicle may have inconsistent or delayed throttle response.
  • Stalling or Idling Issues: Intermittent signal interruptions can lead to rough idling or occasional stalling.


A methodical strategy is needed to correctly identify the P0124 code’s root cause. The following diagnostic procedures can be carried out by a skilled mechanic or an OBD-II scanner:

  • Checking for Codes: The P0124 code may be read and retrieved from the vehicle’s ECM using an OBD-II scanner.
  • Visual Inspection: To find any obvious problems, the TPS, it’s wiring, and its connections must all be thoroughly inspected visually.
  • Testing the TPS: A multimeter should be used to measure the voltage output of the TPS in order to evaluate its performance.
  • TPS Calibration Check: To guarantee accurate readings, the mechanic may check the TPS calibration and alignment.

Common mistakes

Some typical errors can happen during diagnostics and repairs, resulting in inaccurate or inefficient fixes:

  • Ignoring wire and Connectors: A loose connector or broken wire is frequently the cause of problems but is frequently disregarded.
  • Replacing the TPS without Testing: Before considering a replacement, the TPS functioning must be properly tested.
  • Ignoring ECM Issues: Changing the TPS alone could not fix the problem if the ECM is acting up.

How serious is this?

The seriousness of the P0124 code is influenced by a number of factors. The lack of a solution may seem minor, but it could result in reduced engine performance and possibly unsafe driving conditions if the problem is not resolved. It is recommended that the problem be diagnosed and repaired as soon as possible in order to avoid additional complications.

What repairs can fix the code?

repair manuals

The following remedies can be made if the P0124 code’s underlying cause has been found:

  • TPS Replacement: If the sensor is broken, it has to be replaced with a reliable and suitable component.
  • Fixing wires and connections: If required, damaged wires or connections should be fixed or replaced.
  • TPS Calibration and Alignment: Making sure that the TPS is correctly calibrated and aligned might fix intermittent signal problems.

Related codes

Occasionally, other DTCs might accompany the P0124 code, providing additional insights into related issues. Commonly related codes include P0122 (Throttle/Pedal Position Sensor/Switch “A” Circuit Low Input) and P0123 (Throttle/Pedal Position Sensor/Switch “A” Circuit High Input).


Conclusion: Potential problems with the Throttle and pedal position sensor or Switch “A” Circuit are indicated by the P0124 DTC code. Effective treatment of this issue can be helped by knowing its meaning, causes, symptoms, and necessary repairs. Swift diagnosis and proper fixes will not only clear the code but also ensure your vehicle operates optimally, leading to a smoother and safer driving experience.  

To keep your car in excellent condition, it is always recommended that you consult a qualified mechanic for an accurate diagnosis and safe repair.

P0124 Code – What Does It Mean & How To Fix It