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P1120 Hyundai Code - Throttle Position Sensor 1 Circuit

Quick Answer

The P1120 Hyundai diagnostic trouble code refers to an issue with the Throttle Position Sensor 1 Circuit. Common causes include Faulty Throttle Position Sensor, Corroded or damaged wiring/connectors in the TPS circuit, Issues with the throttle body or throttle position sensor mounting. 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
P1120 Hyundai indicates Throttle Position Sensor 1 Circuit.
Common causes
Common causes include Faulty Throttle Position Sensor, Corroded or damaged wiring/connectors in the TPS circuit, Issues with the throttle body or throttle position sensor mounting.
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 07, 2024
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Code P1120 Hyundai Description

The P1120 Hyundai diagnostic trouble code refers to an issue with the Throttle Position Sensor 1 Circuit. The throttle position sensor (TPS) is a crucial component in the vehicle's electronic fuel injection system, as it monitors the position of the throttle valve and sends signals to the engine control unit (ECU) to regulate fuel injection, ignition timing, and other engine functions. The TPS is typically located on the throttle body and consists of a variable resistor or potentiometer that changes resistance as the throttle valve opens and closes.

OBDII Code P1120 Hyundai - Throttle Position Sensor 1 Circuit
P1120 Hyundai Code - Throttle Position Sensor 1 Circuit

Common Causes of P1120 Hyundai

  1. Faulty Throttle Position Sensor
  2. Corroded or damaged wiring/connectors in the TPS circuit
  3. Issues with the throttle body or throttle position sensor mounting
  4. ECU malfunction or software glitches
  5. Environmental factors such as moisture or debris affecting sensor operation

Symptoms of P1120 Hyundai

  1. Poor acceleration or sluggish throttle response
  2. Engine stalling or rough idling
  3. Check engine light illuminated on the dashboard
  4. Difficulty starting the engine
  5. Reduced fuel efficiency

How to Fix P1120 Hyundai

  1. Begin by diagnosing the exact cause of the issue using an OBD-II scanner to retrieve the trouble codes and perform a visual inspection of the TPS and associated wiring.
  2. Test the Throttle Position Sensor using a multimeter to check for proper voltage readings and signal consistency.
  3. Replace the faulty Throttle Position Sensor if necessary, ensuring proper installation and calibration according to manufacturer specifications.
  4. Inspect and repair any damaged wiring or connectors in the TPS circuit to ensure proper electrical connections.
  5. Clear the trouble codes from the ECU and perform a test drive to verify that the issue has been resolved.

Cost to Fix P1120 Hyundai

The typical repair costs for addressing a P1120 Hyundai code related to the Throttle Position Sensor 1 Circuit can range from $150 to $300, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops may vary depending on the location, vehicle make and model, and engine type. It is advisable to inquire about local rates to obtain a more accurate estimate for the repair. Keep in mind that rates at dealerships or in metropolitan areas may be higher, while independent shops often offer more competitive pricing.

When is the Code Detected?

Malfunction is detected when voltage from the sensor is sent to Engine Control Module (ECM) is out of range.

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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 P1120 Hyundai Code

1. What are common symptoms of OBDII code P1120 in a Hyundai related to the Throttle Position Sensor 1 Circuit?

- Common symptoms include poor acceleration, engine misfires, stalling, and rough idling.

2. What are the possible causes of OBDII code P1120 in a Hyundai?

- The code P1120 can be triggered by a faulty throttle position sensor, wiring issues, or a problem with the throttle body.

3. How can I diagnose the Throttle Position Sensor 1 Circuit issue causing OBDII code P1120 in my Hyundai?

- You can use a diagnostic scanner to read the code, check the throttle position sensor's voltage, and inspect the wiring for any signs of damage.

4. Is it safe to drive my Hyundai with OBDII code P1120 related to the Throttle Position Sensor 1 Circuit?

- It is not recommended to drive your vehicle with this code as it can lead to poor performance and potential safety hazards.

5. Can I repair the Throttle Position Sensor 1 Circuit problem causing OBDII code P1120 in my Hyundai on my own?

- If you have experience with automotive repairs and the necessary tools, you may be able to replace the throttle position sensor or repair the wiring yourself.

6. How much does it typically cost to repair OBDII code P1120 in a Hyundai related to the Throttle Position Sensor 1 Circuit?

- The cost can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

7. Are there any preventive measures to avoid OBDII code P1120 related to the Throttle Position Sensor 1 Circuit in my Hyundai?

- Regular maintenance, such as cleaning the throttle body and checking the sensor's connections, can help prevent this issue.

8. Can a dirty throttle body cause OBDII code P1120 in a Hyundai?

- Yes, a dirty or clogged throttle body can affect the sensor's readings and potentially trigger the code P1120.

9. Will resetting the OBDII code P1120 related to the Throttle Position Sensor 1 Circuit in my Hyundai make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue is not fixed, the code is likely to reappear.

10. How long does it take to repair OBDII code P1120 in a Hyundai caused by the Throttle Position Sensor 1 Circuit issue?

- The repair time can vary depending on the exact cause and the mechanic's experience, but it may take anywhere from 1 to 3 hours to complete the repair.

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