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P0120 Hyundai Code - Throttle/Pedal Position Sensor/Switch 'A' Circuit

Quick Answer

The P0120 code for Hyundai vehicles indicates an issue with the Throttle/Pedal Position Sensor/Switch 'A' Circuit. Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or debris affecting sensor operation. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0120 Hyundai indicates Throttle/Pedal Position Sensor/Switch 'A' Circuit.
Common causes
Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or debris affecting sensor operation.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P0120 Hyundai Description

The P0120 code for Hyundai vehicles indicates an issue with the Throttle/Pedal Position Sensor/Switch 'A' Circuit. This sensor is crucial for the proper functioning of the vehicle's electronic throttle control system. The sensor is responsible for monitoring the position of the throttle pedal and transmitting this information to the engine control module (ECM). The ECM uses this data to adjust the throttle position and regulate the amount of air entering the engine, which in turn affects the engine's performance and fuel efficiency.

OBDII Code P0120 Hyundai - Throttle/Pedal Position Sensor/Switch 'A' Circuit
P0120 Hyundai Code - Throttle/Pedal Position Sensor/Switch 'A' Circuit

Common Causes of P0120 Hyundai

  1. Faulty throttle position sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Corrosion or debris affecting sensor operation
  4. ECM software issues
  5. Mechanical issues with the throttle body

Symptoms of P0120 Hyundai

  1. Unresponsive accelerator pedal
  2. Rough idling or stalling
  3. Reduced fuel efficiency
  4. Limp mode activation
  5. Check Engine Light illuminated

How to Fix P0120 Hyundai

  1. Begin by connecting a diagnostic scanner to retrieve the specific trouble code and confirm the issue.
  2. Inspect the throttle position sensor, wiring, and connectors for any visible damage or corrosion. Replace any faulty components.
  3. Test the sensor's output voltage using a multimeter to ensure it is within the manufacturer's specifications.
  4. Clear the trouble code and reset the ECM to see if the issue persists.
  5. If the problem continues, consider reprogramming the ECM or replacing the throttle position sensor.

Cost to Fix P0120 Hyundai

The cost of repairing a P0120 code on a Hyundai can vary depending on the extent of the issue and the specific components that need to be replaced. On average, the parts for this repair can range from $50 to $200, with labor costs adding an additional $100 to $200. As mentioned earlier, labor rates can vary between different auto repair shops, so it's advisable to get quotes from several places to find the best price.

When is the Code Detected?

Malfunction is detected when an excessively low or high voltage from the sensor is sent to Engine Control Module (ECM).

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0120 Hyundai Code

1. What are common symptoms of OBDII code P0120 in a Hyundai related to the Throttle/Pedal Position Sensor/Switch 'A' Circuit?

The common symptoms include issues with acceleration, poor engine performance, stalling, and in some cases, the vehicle may go into "limp mode."

2. What are some possible causes of OBDII code P0120 in a Hyundai?

Possible causes include a faulty throttle position sensor, problems with the wiring or connectors in the sensor circuit, or issues with the engine control module (ECM).

3. Can driving with an unresolved P0120 code cause further damage to the vehicle?

Continuing to drive with an unresolved P0120 code can potentially lead to decreased fuel efficiency, engine misfires, and even more severe issues if left unaddressed for an extended period.

4. How can I diagnose the Throttle/Pedal Position Sensor/Switch 'A' Circuit issue causing OBDII code P0120 in my Hyundai?

Diagnosis typically involves using an OBDII scanner to read the code, testing the throttle position sensor's voltage and resistance, and inspecting the sensor's wiring and connectors for any visible damage.

5. Is it possible to repair the Throttle/Pedal Position Sensor/Switch 'A' Circuit issue myself?

If you have experience with automotive repairs and access to the necessary tools, you may be able to replace the throttle position sensor or repair wiring issues yourself. However, if you are unsure, it's recommended to consult a professional mechanic.

6. Are there any maintenance tips to prevent OBDII code P0120 in a Hyundai?

Regularly checking and cleaning the throttle position sensor, ensuring proper wiring connections, and addressing any engine performance issues promptly can help prevent the occurrence of the P0120 trouble code.

7. How long does it typically take to repair the Throttle/Pedal Position Sensor/Switch 'A' Circuit issue triggering OBDII code P0120?

The repair time can vary depending on the exact cause of the issue and the mechanic's expertise. In general, replacing the throttle position sensor or repairing wiring may take a few hours to complete.

8. Can resetting the OBDII code P0120 in a Hyundai make the issue go away permanently?

Resetting the code may temporarily turn off the check engine light, but if the underlying problem causing the P0120 persists, the code is likely to return. It's crucial to diagnose and address the root cause of the issue.

9. What is the typical cost to repair OBDII code P0120 related to the Throttle/Pedal Position Sensor/Switch 'A' Circuit in a Hyundai?

The cost of the repair can vary based on the specific parts needed, labor rates, and whether you choose to go to a dealership or an independent mechanic. On average, the repair cost can range from $100 to $300.

10. Are there any recalls or technical service bulletins related to OBDII code P0120 in Hyundai vehicles?

It's advisable to check with your nearest Hyundai dealership or visit the manufacturer's website to inquire about any recalls or technical service bulletins related to the Throttle/Pedal Position Sensor/Switch 'A' Circuit issue triggering OBDII code P0120 in your specific vehicle model.

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