AutoCodes – Hyundai – P2120 Hyundai

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

Quick Answer

The Accelerator Pedal Position (APP) sensor is made up of 2 sensors that are housed inside one assembly. Common causes include Faulty Accelerator Pedal Position Sensor, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal Position Sensor circuit poor electrical connection. 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 Accelerator Pedal Position Sensor, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal Position Sensor circuit poor electrical connection.
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.

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Code Popularity 4,825

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2120 Hyundai Description

The Accelerator Pedal Position (APP) sensor is made up of 2 sensors that are housed inside one assembly. The Engine Control Module (ECM) supplies a separate 5-volt reference circuit and a low reference circuit for each of the sensors. The 5-volt reference for APP sensor 1 is supplied from the same source in the ECM as the 5-volt reference for the mass air flow (MAF) sensor and the fuel tank pressure (FTP) sensor. The 5-volt reference voltage for all of the sensors is supplied on separate ECM terminals, but the terminals are connected internally to a voltage supply. The APP sensor 1 sends a signal from the sensor to the ECM indicating the accelerator pedal position. The ECM actuates the throttle plates based on this information. If the ECM detects that the APP sensors are not within a predicted value from each other, DTC P2120 sets.

OBDII Code P2120 Hyundai - Throttle/Pedal Position Sensor/Switch 'D' Circuit - AutoCodes.com — P2120 Hyundai Code - Throttle/Pedal Position Sensor/Switch 'D' Circuit

What does this mean?

What are the Possible Causes of the DTC P2120 Hyundai?

Faulty Accelerator Pedal Position Sensor
Accelerator Pedal Position Sensor harness is open or shorted
Accelerator Pedal Position Sensor circuit poor electrical connection
Faulty Electric Throttle Control Actuator

How to Fix the DTC P2120 Hyundai?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2120 Hyundai code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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.