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Engine-Codes – Dodge – P2120 Dodge

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

Quick Answer

The P2120 code for Dodge vehicles indicates a problem with the Throttle/Pedal Position Sensor/Switch 'D' Circuit. Common causes include Faulty Throttle/Pedal Position Sensor/Switch, Wiring or connector issues in the sensor circuit, Corrosion or contamination in the sensor contacts. 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 Dodge indicates Throttle/Pedal Position Sensor/Switch 'D' Circuit.
Common causes
Common causes include Faulty Throttle/Pedal Position Sensor/Switch, Wiring or connector issues in the sensor circuit, Corrosion or contamination in the sensor contacts.
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 Dodge Description

The P2120 code for Dodge vehicles indicates a problem with the Throttle/Pedal Position Sensor/Switch 'D' Circuit. This sensor is crucial for the proper operation of the vehicle's throttle system, as it detects the position of the throttle pedal and sends this information to the engine control module (ECM). The ECM then uses this data to adjust the air-fuel mixture and control the throttle opening accordingly.

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

Common Causes of P2120 Dodge

  1. Faulty Throttle/Pedal Position Sensor/Switch
  2. Wiring or connector issues in the sensor circuit
  3. Corrosion or contamination in the sensor contacts
  4. ECM software or hardware problems
  5. Mechanical issues with the throttle body or pedal assembly

Symptoms of P2120 Dodge

  1. Hesitation or jerking during acceleration
  2. Rough idling or stalling
  3. Reduced engine power
  4. Check Engine Light illuminated
  5. Difficulty maintaining a constant speed

How to Fix P2120 Dodge

  1. Begin by diagnosing the specific cause of the code using a scan tool to retrieve freeze frame data and live sensor readings.
  2. Inspect the wiring harness and connectors for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test the Throttle/Pedal Position Sensor/Switch for proper operation using a multimeter or oscilloscope. Replace the sensor if it fails the test.
  4. Clear the code from the ECM memory and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be required to pinpoint the exact source of the issue, such as checking for voltage drops or signal interruptions along the sensor circuit.

Cost to Fix P2120 Dodge

The cost of repairing a P2120 code on a Dodge vehicle can vary depending on the specific cause of the issue and the labor rates at the repair shop. In general, replacing the Throttle/Pedal Position Sensor/Switch or repairing wiring issues can range from $150 to $400 for parts and labor. Additional diagnostic time may be needed, which can add to the overall cost. It's advisable to consult with a trusted mechanic or dealership for a more accurate estimate based on your vehicle's make and model.

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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 Dodge Code

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

- Common symptoms can include issues with acceleration, rough idling, poor fuel efficiency, and potential stalling of the vehicle.

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

- The code P2120 can be triggered by a faulty throttle position sensor, wiring issues, a defective pedal position sensor, or a problem with the electronic throttle control system.

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

- To diagnose the issue, you can use an OBDII scanner to read the trouble codes, visually inspect the wiring and connectors, test the throttle position sensor, and check the pedal position sensor for proper operation.

4. Can a DIY enthusiast repair OBDII code P2120 in a Dodge related to the Throttle/Pedal Position Sensor/Switch 'D' Circuit?

- While some basic diagnostics and checks can be done by a DIY enthusiast, repairing the root cause of the code may require specialized tools and expertise, especially if it involves sensor replacement or wiring repair.

5. Is it safe to continue driving my Dodge with OBDII code P2120 present?

- It is not recommended to drive your Dodge with an unresolved OBDII code P2120, as it can lead to further damage to the engine or components, and potentially compromise the safety and performance of the vehicle.

6. How much does it typically cost to repair OBDII code P2120 in a Dodge?

- The cost of repairing OBDII code P2120 can vary depending on the root cause of the issue, the labor rates in your area, and whether you choose to go to a dealership or an independent mechanic. It's advisable to get multiple quotes for an accurate estimate.

7. Can a faulty Throttle/Pedal Position Sensor/Switch 'D' Circuit cause other issues in my Dodge?

- Yes, a faulty sensor or circuit related to the throttle and pedal positions can lead to drivability issues, poor engine performance, and even trigger other trouble codes in the vehicle's onboard diagnostics system.

8. Are there any preventive maintenance tips to avoid encountering OBDII code P2120 in a Dodge?

- Regularly inspecting and cleaning the throttle body, ensuring proper engine maintenance, and addressing any warning signs related to engine performance can help prevent issues that may trigger OBDII code P2120.

9. How long does it typically take to repair OBDII code P2120 in a Dodge at a repair shop?

- The repair time for OBDII code P2120 can vary depending on the complexity of the issue, availability of parts, and the workload at the repair shop. It's recommended to inquire about the estimated repair time when scheduling an appointment.

10. Can resetting the ECU clear OBDII code P2120 in a Dodge?

- Resetting the ECU may temporarily clear the code, but if the underlying issue causing OBDII code P2120 is not addressed, the code is likely to reappear. It's essential to diagnose and fix the root cause of the problem for a lasting solution.

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