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P2122 2001 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low

Quick Answer

The P2122 diagnostic trouble code (DTC) for a 2001 Toyota Highlander indicates a problem with the Throttle Pedal Position Sensor/Switch 'D' Circuit Input being low. Common causes include Faulty throttle pedal position sensor, Wiring or connector issues in the sensor circuit, Corrosion or damage to sensor components. 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 2001 Toyota Highlander indicates Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low.
Common causes
Common causes include Faulty throttle pedal position sensor, Wiring or connector issues in the sensor circuit, Corrosion or damage to sensor components.
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 2001 Toyota Highlander Description

The P2122 diagnostic trouble code (DTC) for a 2001 Toyota Highlander indicates a problem with the Throttle Pedal Position Sensor/Switch 'D' Circuit Input being low. This sensor is crucial for the proper functioning of the vehicle's electronic throttle control system. The throttle pedal position sensor detects the position of the accelerator pedal and sends this information to the engine control module (ECM). The ECM then uses this data to determine the appropriate throttle response and fuel delivery for the engine.

OBDII Code P2122 2001 Toyota Highlander - Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
P2122 2001 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low

Common Causes of P2122 2001 Toyota Highlander

  1. Faulty throttle pedal position sensor.
  2. Wiring or connector issues in the sensor circuit.
  3. Corrosion or damage to sensor components.
  4. ECM software or hardware issues.
  5. Electrical system malfunctions.

Symptoms of P2122 2001 Toyota Highlander

  1. Hesitation or lack of response when pressing the accelerator pedal.
  2. Engine stalling or rough idling.
  3. Reduced power or acceleration.
  4. Check Engine Light illuminated on the dashboard.
  5. Vehicle going into limp mode (limited power mode).

How to Fix P2122 2001 Toyota Highlander

  1. Begin by diagnosing the issue using a scan tool to confirm the P2122 code and check for any related codes.
  2. Inspect the throttle pedal position sensor, wiring, and connectors for any visible damage or corrosion.
  3. Test the sensor's voltage output using a multimeter to determine if it is within the specified range.
  4. If the sensor is faulty, replace it with a new one following the manufacturer's guidelines.
  5. Clear the DTC codes and perform a test drive to ensure the issue has been resolved.

Cost to Fix P2122 2001 Toyota Highlander

The cost of repairing a Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low issue on a 2001 Toyota Highlander can vary depending on the specific cause of the problem and the labor rates in your area. Typically, the cost of a new throttle pedal position sensor ranges from $50 to $150, while labor costs can range from $100 to $200. Therefore, the total repair cost could be anywhere from $150 to $350. It's important to note that these are rough estimates, and actual costs may differ based on individual circumstances. Additionally, diagnostic time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate 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 2001 Toyota Highlander Code

1. What does the OBDII code P2122 on a 2001 Toyota Highlander mean?

The code P2122 indicates a problem with the Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low in your vehicle.

2. What are the common symptoms of a P2122 code in a 2001 Toyota Highlander?

Common symptoms of a P2122 code may include reduced engine power, hesitation during acceleration, and the vehicle going into limp mode.

3. What can cause the Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low code in a 2001 Toyota Highlander?

The P2122 code can be triggered by issues such as a faulty throttle pedal position sensor, damaged wiring or connectors, or a problem with the engine control module (ECM).

4. How can I diagnose the P2122 code in my 2001 Toyota Highlander?

To diagnose the P2122 code, you can use an OBDII scanner to read the code, inspect the throttle pedal position sensor and its connections, and perform a thorough visual inspection of related wiring.

5. What are the possible repair options for a P2122 code in a 2001 Toyota Highlander?

Repair options for a P2122 code may include replacing the throttle pedal position sensor, repairing or replacing damaged wiring, and resetting the ECM to clear the code.

6. Is it safe to drive a 2001 Toyota Highlander with a P2122 code?

It is not recommended to drive your vehicle with a P2122 code, as it can lead to further damage and safety risks. It's best to address the issue promptly.

7. Can a DIY enthusiast fix a P2122 code in a 2001 Toyota Highlander?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to address a P2122 code by replacing the throttle pedal position sensor or repairing damaged wiring.

8. How much does it cost to repair a P2122 code in a 2001 Toyota Highlander?

The cost of repairing a P2122 code can vary based on the root cause of the issue, parts needed, and labor rates. It's advisable to consult a mechanic for an accurate estimate.

9. Will a P2122 code reset itself in a 2001 Toyota Highlander?

In some cases, a P2122 code may reset itself after the underlying issue is addressed. However, it's recommended to clear the code using an OBDII scanner to prevent recurring problems.

10. How can I prevent the P2122 code from reoccurring in my 2001 Toyota Highlander?

To prevent the P2122 code from reoccurring, regularly inspect and maintain the throttle pedal position sensor, keep an eye on wiring integrity, and address any related issues promptly.

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