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Engine-Codes – Toyota – P2122 2006 Toyota Highlander

P2122 2006 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low

Quick Answer

The P2122 diagnostic trouble code (DTC) for a 2006 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 sensor circuit, Corrosion or poor electrical connections in the sensor circuit. 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 2006 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 sensor circuit, Corrosion or poor electrical connections in the sensor circuit.
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 2006 Toyota Highlander Description

The P2122 diagnostic trouble code (DTC) for a 2006 Toyota Highlander refers to the Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low. This code indicates that the Engine Control Module (ECM) has detected a lower than expected voltage signal from the throttle pedal position sensor or switch 'D'. The throttle pedal position sensor is a vital component of the electronic throttle control system, which regulates the amount of air entering the engine to control acceleration and overall performance.

OBDII Code P2122 2006 Toyota Highlander - Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
P2122 2006 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low

Common Causes of P2122 2006 Toyota Highlander

  1. Faulty throttle pedal position sensor.
  2. Damaged wiring or connectors in the sensor circuit.
  3. Corrosion or poor electrical connections in the sensor circuit.
  4. Issues with the ECM or other related control modules.
  5. Environmental factors such as moisture or debris affecting sensor operation.

Symptoms of P2122 2006 Toyota Highlander

  1. Erratic acceleration or lack of response when pressing the throttle pedal.
  2. Poor fuel efficiency and decreased engine performance.
  3. Check Engine Light illuminated on the dashboard.
  4. Stalling or hesitation during acceleration.
  5. Rough idling or engine misfires.

How to Fix P2122 2006 Toyota Highlander

  1. Begin by conducting a thorough inspection of the throttle pedal position sensor and its wiring harness for any visible damage or corrosion.
  2. Use a multimeter to test the voltage output of the sensor to determine if it is within the manufacturer's specified range.
  3. If the sensor is faulty, replace it with a new OEM or high-quality aftermarket sensor.
  4. Clear the DTC from the ECM using a diagnostic scanner and perform a test drive to ensure the code does not return.
  5. If the issue persists, further diagnosis may be required to check for any underlying electrical issues or ECM malfunctions.

Cost to Fix P2122 2006 Toyota Highlander

The typical repair costs for addressing a P2122 code on a 2006 Toyota Highlander can vary depending on the specific cause of the issue. Replacement throttle pedal position sensors can range from $50 to $150, while labor costs can range from $100 to $200. Overall, the total repair cost may fall between $150 and $350. It is important to note that diagnosis time and labor rates at auto repair shops can vary, so it is advisable to check with local shops for a more precise estimate.

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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 2006 Toyota Highlander Code

1. What are the common symptoms of OBDII code P2122 in a 2006 Toyota Highlander?

The common symptoms of OBDII code P2122 include reduced engine power, hesitation or stalling when accelerating, and the vehicle going into limp mode.

2. What does the Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low mean for a 2006 Toyota Highlander?

The code P2122 indicates that the Engine Control Module (ECM) has detected a low voltage signal from the throttle pedal position sensor or switch 'D' circuit.

3. What are the possible causes of OBDII code P2122 in a 2006 Toyota Highlander?

The possible causes of code P2122 include a faulty throttle pedal position sensor, damaged wiring or connectors in the sensor circuit, or a problem with the ECM.

4. How can I diagnose OBDII code P2122 in my 2006 Toyota Highlander?

Diagnosing code P2122 involves checking the throttle pedal position sensor for proper voltage output, inspecting the sensor wiring and connectors for damage, and testing the ECM's communication with the sensor.

5. Can I still drive my 2006 Toyota Highlander with OBDII code P2122?

It is not recommended to drive your vehicle with OBDII code P2122, as it can lead to poor performance and potential safety issues. It's best to address the underlying problem promptly.

6. How can I repair OBDII code P2122 in my 2006 Toyota Highlander?

To repair code P2122, you may need to replace the throttle pedal position sensor, repair any damaged wiring or connectors, or reprogram the ECM if necessary.

7. Will resetting the ECM clear OBDII code P2122 in my 2006 Toyota Highlander?

Resetting the ECM may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return. It's important to diagnose and repair the root cause of the problem.

8. Is OBDII code P2122 a common issue in 2006 Toyota Highlanders?

While not extremely common, OBDII code P2122 can occur in 2006 Toyota Highlanders due to sensor failures, wiring issues, or ECM malfunctions.

9. Can a DIY enthusiast fix OBDII code P2122 in a 2006 Toyota Highlander?

Depending on your skill level and access to tools, a DIY enthusiast may be able to diagnose and repair code P2122 by following the manufacturer's repair procedures and using the appropriate diagnostic equipment.

10. How much does it cost to repair OBDII code P2122 in a 2006 Toyota Highlander?

The cost of repairing code P2122 can vary depending on the exact cause of the issue. Replacing the throttle pedal position sensor or repairing wiring may cost a few hundred dollars, while ECM replacement could be more expensive.

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