The throttle pedal position sensor, also known as the accelerator pedal position sensor, is a crucial component in modern Hyundai Sonata models. This sensor translates the movement of the gas pedal into electronic signals that control fuel delivery to the engine.

Function and Location

The throttle pedal position sensor is typically located on the accelerator pedal assembly in Hyundai Sonata vehicles. It measures the position and speed of pedal movement, converting this information into voltage signals for the engine control module (ECM).

Symptoms of a Faulty Sensor

When the throttle pedal position sensor malfunctions, several issues can arise:

  • Check Engine Light: Illumination of the check engine light, often accompanied by error codes P0120 to P0124.
  • Erratic Acceleration: Jerky or hesitant acceleration when pressing the gas pedal.
  • Shifting Problems: In automatic transmissions, you may experience delayed or harsh gear shifts.
  • Poor Fuel Economy: Incorrect fuel delivery can lead to decreased fuel efficiency.
  • Stalling or Limp Mode: In severe cases, the engine may stall or enter a reduced power "limp mode".

Testing the Sensor

To test the throttle pedal position sensor:

1. Use an OBD-II scanner to check for relevant error codes.

2. Measure the sensor's voltage output using a multimeter while slowly depressing the accelerator pedal.

3. Observe the voltage change, which should be smooth and consistent.

Replacement Process

Replacing the throttle pedal position sensor in a Hyundai Sonata typically involves:

1. Disconnecting the vehicle's battery.

2. Locating the sensor under the dashboard near the accelerator pedal.

3. Removing any necessary panels or obstructions.

4. Disconnecting the electrical connector and removing mounting bolts.

5. Installing the new sensor and reconnecting all components.

6. Resetting the ECM if necessary.

Cost Considerations

The cost of replacing a throttle pedal position sensor in a Hyundai Sonata can vary:

ComponentEstimated Cost
Parts$200 - $300
Labor$80 - $150
Total$280 - $450

Prices may differ based on the specific Sonata model year and your location.

Preventive Maintenance

To maintain the throttle pedal position sensor:

  • Keep the pedal area clean and free from debris.
  • Avoid exposing the sensor to excessive moisture.
  • Have regular vehicle diagnostics performed to catch issues early.

By understanding the function and symptoms of a faulty throttle pedal position sensor, Hyundai Sonata owners can address issues promptly, ensuring optimal vehicle performance and safety.