Engine-Codes.com
Engine-Codes – Toyota – P2123 2005 Toyota Highlander

P2123 2005 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'D' Circuit Input High

Quick Answer

The diagnostic trouble code (DTC) P2123 for a 2005 Toyota Highlander indicates a problem with the Throttle Pedal Position Sensor/Switch 'D' Circuit Input High. Common causes include Faulty throttle pedal position sensor, Wiring or connector issues in the throttle pedal position sensor circuit, ECM malfunction. 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
P2123 2005 Toyota Highlander indicates Throttle Pedal Position Sensor/Switch 'D' Circuit Input High.
Common causes
Common causes include Faulty throttle pedal position sensor, Wiring or connector issues in the throttle pedal position sensor circuit, ECM malfunction.
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
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P2123 2005 Toyota Highlander Description

The diagnostic trouble code (DTC) P2123 for a 2005 Toyota Highlander indicates a problem with the Throttle Pedal Position Sensor/Switch 'D' Circuit Input High. This code specifically relates to the throttle pedal position sensor, which is a crucial component in the electronic throttle control system of the vehicle. The throttle pedal position sensor detects the position of the accelerator pedal and sends this information to the engine control module (ECM) to determine the appropriate throttle response.

OBDII Code P2123 2005 Toyota Highlander - Throttle Pedal Position Sensor/Switch 'D' Circuit Input High
P2123 2005 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'D' Circuit Input High

Common Causes of P2123 2005 Toyota Highlander

  1. Faulty throttle pedal position sensor
  2. Wiring or connector issues in the throttle pedal position sensor circuit
  3. ECM malfunction
  4. Corrosion or damage to sensor components
  5. Electrical interference or short circuits in the system

Symptoms of P2123 2005 Toyota Highlander

  1. Reduced engine power
  2. Delayed throttle response
  3. Engine stalling or surging
  4. Illumination of the Check Engine Light
  5. Difficulty maintaining a consistent speed

How to Fix P2123 2005 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. Test the throttle pedal position sensor using a multimeter to check for proper voltage output.
  3. If the sensor is faulty, replace it with a new OEM part and ensure proper calibration.
  4. Clear the DTC from the ECM memory using a diagnostic scan tool.
  5. Perform a test drive to verify that the issue has been resolved and that the throttle response is now functioning correctly.

Cost to Fix P2123 2005 Toyota Highlander

The cost estimate for repairing the Throttle Pedal Position Sensor/Switch 'D' Circuit Input High issue on a 2005 Toyota Highlander can vary depending on the specific cause of the problem and the cost of parts and labor in your area. Generally, replacing the throttle pedal position sensor can range from $100 to $200, while diagnostic labor costs can add an additional $80 to $150. Overall, the total repair cost could amount to approximately $200 to $400. It's recommended to consult with a qualified mechanic or auto repair shop to get an accurate quote based on your vehicle's needs.

Need more information about the P2123 2005 Toyota Highlander code?

Need more information on how to fix the P2123 2005 Toyota Highlander code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2123 2005 Toyota Highlander code diagnosed by a professional: Find a repair shop in your area

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 P2123 2005 Toyota Highlander Code

1. What are the common symptoms of OBDII code P2123 in a 2005 Toyota Highlander?

- Common symptoms include reduced engine power, hesitation or surging during acceleration, and the vehicle going into limp mode.

2. What does the OBDII code P2123 for a 2005 Toyota Highlander indicate?

- The code P2123 indicates an issue with the Throttle Pedal Position Sensor/Switch 'D' Circuit Input High.

3. What are the possible causes of OBDII code P2123 in a 2005 Toyota Highlander?

- Possible causes include a faulty throttle pedal position sensor, damaged wiring or connectors in the circuit, or a malfunctioning Engine Control Module (ECM).

4. How can I diagnose the cause of OBDII code P2123 in my 2005 Toyota Highlander?

- You can diagnose the issue by inspecting the throttle pedal position sensor, checking the wiring for damage, and using a scan tool to monitor sensor readings and ECM data.

5. Can I still drive my 2005 Toyota Highlander with OBDII code P2123?

- It is not recommended to drive the vehicle with code P2123 as it can lead to potential safety hazards and further damage to the engine components.

6. How can I repair OBDII code P2123 in my 2005 Toyota Highlander?

- Repair options include replacing the throttle pedal position sensor, repairing any damaged wiring or connectors, and resetting the ECM to clear the code.

7. Will OBDII code P2123 reset itself after repairs are made to a 2005 Toyota Highlander?

- In some cases, the code may reset itself after repairs are made, but it is recommended to use a scan tool to clear the code manually to ensure proper functioning of the system.

8. Can a DIY enthusiast fix OBDII code P2123 in a 2005 Toyota Highlander?

- Depending on the level of expertise, a DIY enthusiast may be able to fix the issue by following repair guides and using the necessary tools to diagnose and replace components.

9. What is the typical cost to repair OBDII code P2123 in a 2005 Toyota Highlander at a mechanic or dealership?

- The cost of repair can vary but typically ranges from $150 to $400, including parts and labor, when repaired at a mechanic or dealership.

10. Are there any preventive measures to avoid OBDII code P2123 in a 2005 Toyota Highlander?

- Regular maintenance of the throttle system, checking for any signs of wear or damage, and addressing any issues promptly can help prevent the occurrence of code P2123.

Discuss the causes and fixes for P2123 2005 Toyota Highlander OBDII Code

Submit a New Comment

Code P2123 2005 Toyota Highlander comments

No comments found for this page.