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P2122 2003 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low

Quick Answer

The P2122 diagnostic trouble code (DTC) for a 2003 Toyota Highlander refers to the Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low. Common causes include Faulty throttle pedal position sensor, Damaged wiring or connectors in the circuit, Malfunctioning 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
P2122 2003 Toyota Highlander indicates Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low.
Common causes
Common causes include Faulty throttle pedal position sensor, Damaged wiring or connectors in the circuit, Malfunctioning 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 17, 2024
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Code P2122 2003 Toyota Highlander Description

The P2122 diagnostic trouble code (DTC) for a 2003 Toyota Highlander refers to the Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low. This code indicates that there is a problem with the electrical circuit that controls the throttle pedal position sensor or switch, specifically in circuit 'D'. The throttle pedal position sensor is a crucial component of the vehicle's electronic throttle control system, which is responsible for determining the position of the throttle pedal and sending this information to the engine control module (ECM). The ECM uses this data to adjust the throttle opening, fuel injection, and ignition timing to optimize engine performance and fuel efficiency.

OBDII Code P2122 2003 Toyota Highlander - Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
P2122 2003 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low

Common Causes of P2122 2003 Toyota Highlander

  1. Faulty throttle pedal position sensor.
  2. Damaged wiring or connectors in the circuit.
  3. Malfunctioning ECM.
  4. Issues with the throttle body.
  5. Corrosion or contamination in the sensor or circuit.

Symptoms of P2122 2003 Toyota Highlander

  1. Poor acceleration or lack of response when pressing the throttle pedal.
  2. Rough idling or engine misfires.
  3. Stalling or difficulty starting the engine.
  4. Reduced engine power or the vehicle going into limp mode.
  5. Illumination of the check engine light on the dashboard.

How to Fix P2122 2003 Toyota Highlander

  1. Begin by conducting a thorough inspection of the throttle pedal position sensor, wiring, and connectors to identify any visible damage or issues.
  2. Test the sensor using a multimeter to check for proper voltage output and resistance within the specified range.
  3. If the sensor is faulty, replace it with a new one and ensure it is properly calibrated.
  4. Check and repair any damaged wiring or connectors in the circuit.
  5. Clear the DTC with a scan tool and perform a test drive to confirm that the issue has been resolved.

Cost to Fix P2122 2003 Toyota Highlander

The typical repair costs for addressing a Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low code on a 2003 Toyota Highlander can vary depending on the specific cause of the issue. In general, the cost of replacing a throttle pedal position sensor can range from $100 to $200, while repairing wiring or connectors may cost between $50 and $150. Labor costs at auto repair shops typically range from $80 to $150 per hour, and the total repair bill could amount to a few hundred dollars. It is advisable to consult with a qualified mechanic or dealership to obtain a more accurate estimate based on the specific diagnosis and repair requirements for 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 P2122 2003 Toyota Highlander Code

1. What are the common symptoms of OBDII code P2122 in a 2003 Toyota Highlander?

- Common symptoms include reduced engine power, hesitation or stalling when accelerating, and the vehicle going into "limp mode."

2. What does the OBDII code P2122 indicate in a 2003 Toyota Highlander?

- The code P2122 indicates an issue with the Throttle Pedal Position Sensor/Switch 'D' Circuit Input being lower than expected.

3. What are the possible causes of OBDII code P2122 in a 2003 Toyota Highlander?

- Possible causes include a faulty throttle pedal position sensor, damaged wiring or connectors in the sensor circuit, or a problem with the engine control module.

4. How can I diagnose the cause of OBDII code P2122 in my 2003 Toyota Highlander?

- You can use a scan tool to check for any additional related codes, visually inspect the throttle pedal sensor and its wiring, and perform tests to check the sensor's resistance.

5. Can I drive my 2003 Toyota Highlander with OBDII code P2122?

- It is not recommended to drive the vehicle with this code as it can affect the engine's performance and may lead to safety issues. It's best to address the issue promptly.

6. How can I repair OBDII code P2122 in my 2003 Toyota Highlander?

- Repair options include replacing the throttle pedal position sensor, repairing any damaged wiring or connectors, or reprogramming the engine control module if needed.

7. Will resetting the OBDII code P2122 in my 2003 Toyota Highlander fix the issue?

- Resetting the code may temporarily clear the check engine light, but it will not fix the underlying problem causing the code to trigger. Proper diagnosis and repair are needed.

8. How much does it typically cost to repair OBDII code P2122 in a 2003 Toyota Highlander?

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

9. Can a DIY enthusiast fix OBDII code P2122 in a 2003 Toyota Highlander?

- Depending on your level of expertise, you may be able to replace the throttle pedal position sensor yourself. However, proper diagnosis is crucial to ensure the correct repair.

10. How long does it take to repair OBDII code P2122 in a 2003 Toyota Highlander?

- The repair time can vary based on the exact cause of the issue and the availability of parts. It may take anywhere from 1 to 3 hours for a professional mechanic to complete the repair.

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