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Engine-Codes – Generic – P2120

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

Quick Answer

The P2120 code indicates a problem with the Throttle/Pedal Position Sensor/Switch 'D' Circuit in the vehicle. Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the sensor circuit, Issues with the ECM. 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 indicates Throttle/Pedal Position Sensor/Switch 'D' Circuit.
Common causes
Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the sensor circuit, Issues with the ECM.
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 12, 2024
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Code P2120 Description

The P2120 code indicates a problem with the Throttle/Pedal Position Sensor/Switch 'D' Circuit in the vehicle. This sensor is responsible for monitoring the position of the throttle pedal and sending this information to the engine control module (ECM). The ECM uses this data to determine how much air and fuel to deliver to the engine for optimal performance. When this sensor or its circuit malfunctions, it can lead to a variety of issues that affect the vehicle's performance.

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

Common Causes of P2120

  1. Faulty throttle position sensor.
  2. Damaged wiring or connectors in the sensor circuit.
  3. Issues with the ECM.
  4. Corrosion or contamination affecting sensor operation.
  5. Mechanical damage to the throttle pedal or sensor.

Symptoms of P2120

  1. Poor acceleration or hesitation when pressing the throttle pedal.
  2. Engine stalling or rough idling.
  3. Reduced fuel efficiency.
  4. Illumination of the Check Engine Light.
  5. Vehicle going into limp mode.

How to Fix P2120

  1. Begin by connecting a diagnostic scanner to the vehicle's OBD-II port to retrieve the specific trouble codes stored in the ECM.
  2. Inspect the throttle position sensor and its wiring for any visible damage or corrosion. Replace any damaged components as needed.
  3. Test the sensor's operation using a multimeter to ensure it is sending the correct signals to the ECM.
  4. Clear the trouble codes from the ECM's memory and test drive the vehicle to verify that the issue has been resolved.
  5. If the problem persists, further diagnosis may be needed to pinpoint the exact cause of the P2120 code.

Cost to Fix P2120

The typical repair costs for addressing a P2120 code can vary depending on the specific cause of the issue. In general, replacing a faulty throttle position sensor can cost between $100 to $300, including parts and labor. However, if the issue stems from wiring or ECM problems, the repair costs may be higher. It's advisable to consult with a trusted mechanic or auto repair shop for a more accurate estimate based on the specific vehicle make and model. Keep in mind that diagnosis time and labor rates can vary, so it's recommended to inquire about these factors before proceeding with the repair.

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Code P2120 Information for Specific Makes

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.

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