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P2120 Hyundai Code - Throttle/Pedal Position Sensor/Switch 'D' Circuit

Quick Answer

The P2120 diagnostic trouble code for Hyundai vehicles refers to an issue with the Throttle/Pedal Position Sensor/Switch 'D' Circuit. Common causes include Faulty Throttle/Pedal Position Sensor/Switch 'D', Damaged wiring or connectors in the sensor circuit, Corrosion or moisture in the sensor connections. 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
P2120 Hyundai indicates Throttle/Pedal Position Sensor/Switch 'D' Circuit.
Common causes
Common causes include Faulty Throttle/Pedal Position Sensor/Switch 'D', Damaged wiring or connectors in the sensor circuit, Corrosion or moisture in the sensor connections.
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 P2120 Hyundai Description

The P2120 diagnostic trouble code for Hyundai vehicles refers to an issue with the Throttle/Pedal Position Sensor/Switch 'D' Circuit. This sensor is a crucial component of the vehicle's electronic throttle control system and is responsible for monitoring the position of the throttle pedal. The sensor sends signals to the engine control module (ECM) to determine how much air and fuel should be delivered to the engine for optimal performance. When this sensor malfunctions or the circuit is compromised, it can lead to a variety of performance issues and potentially cause the vehicle to go into a limp mode.

OBDII Code P2120 Hyundai - Throttle/Pedal Position Sensor/Switch 'D' Circuit
P2120 Hyundai Code - Throttle/Pedal Position Sensor/Switch 'D' Circuit

Common Causes of P2120 Hyundai

  1. Faulty Throttle/Pedal Position Sensor/Switch 'D'
  2. Damaged wiring or connectors in the sensor circuit
  3. Corrosion or moisture in the sensor connections
  4. ECM software or hardware issues
  5. Mechanical problems with the throttle body or pedal assembly

Symptoms of P2120 Hyundai

  1. Check engine light illuminated on the dashboard
  2. Reduced engine power or acceleration
  3. Engine stalling or hesitation
  4. Rough idling or irregular engine speed
  5. Difficulty maintaining speed or cruising on the highway

How to Fix P2120 Hyundai

  1. Begin by connecting a diagnostic scanner to the vehicle's OBD-II port to retrieve the specific trouble code and confirm the issue.
  2. Inspect the Throttle/Pedal Position Sensor/Switch 'D' and its wiring for any visible damage or corrosion. Replace the sensor if necessary.
  3. Check and repair any damaged or loose connections in the sensor circuit.
  4. Clear the trouble code from the ECM's memory using the diagnostic scanner.
  5. Test drive the vehicle to ensure that the issue has been resolved and that the check engine light no longer illuminates.

Cost to Fix P2120 Hyundai

The typical repair costs for addressing a P2120 Throttle/Pedal Position Sensor/Switch 'D' Circuit issue can vary depending on the specific cause of the problem and the labor rates at the auto repair shop. In general, the cost of replacing the sensor and addressing related wiring issues can range from $150 to $400. Additional costs may be incurred if other components need to be replaced or if diagnostic time is required to pinpoint the exact cause of the issue. It is advisable to consult with a trusted mechanic or service center to receive a more accurate estimate based on the specific circumstances of your vehicle.

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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 P2120 Hyundai Code

1. What are the common symptoms of OBDII code P2120 in a Hyundai related to the Throttle/Pedal Position Sensor/Switch 'D' Circuit?

- Common symptoms include issues with acceleration, poor engine performance, intermittent stalling, and the vehicle going into limp mode.

2. What are the possible causes of OBDII code P2120 in a Hyundai?

- The code P2120 could be triggered by a faulty throttle position sensor, damaged wiring in the throttle pedal circuit, or a malfunction in the engine control module.

3. How can I diagnose the cause of OBDII code P2120 in my Hyundai?

- Diagnosing OBDII code P2120 involves using a scan tool to check for the code, inspecting the throttle position sensor and pedal circuit for damage, and testing the voltage and resistance in the circuit.

4. Can I continue driving my Hyundai with OBDII code P2120 present?

- It is not recommended to drive the vehicle with OBDII code P2120 as it can lead to further damage and potentially unsafe driving conditions.

5. How can I repair OBDII code P2120 in my Hyundai?

- Repairing OBDII code P2120 involves replacing the faulty throttle position sensor, repairing any damaged wiring in the circuit, or reprogramming the engine control module if necessary.

6. Are there any DIY tips for fixing OBDII code P2120 in a Hyundai?

- DIY tips include checking for loose connections, cleaning the throttle position sensor, and ensuring proper installation of any replacement parts.

7. How much does it cost to repair OBDII code P2120 in a Hyundai?

- The cost of repairing OBDII code P2120 can vary depending on the exact cause of the issue, but it typically ranges from $100 to $300 for parts and labor.

8. Can a mechanic reset OBDII code P2120 without fixing the underlying issue?

- While a mechanic can reset the code, it is not recommended as the underlying issue causing OBDII code P2120 will likely persist and trigger the code again.

9. How long does it take to repair OBDII code P2120 in a Hyundai?

- Repairing OBDII code P2120 usually takes around 1-2 hours, but this can vary based on the specific diagnosis and repair needed.

10. Is OBDII code P2120 a common issue in Hyundai vehicles?

- OBDII code P2120 related to the Throttle/Pedal Position Sensor/Switch 'D' Circuit is a relatively common issue in Hyundai vehicles, especially in models with electronic throttle control systems.

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