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Engine-Codes – Toyota – P0122 2001 Toyota Highlander

P0122 2001 Toyota Highlander Code - Throttle Position Sensor/Switch 'A' Circuit Low Input

Quick Answer

The P0122 diagnostic trouble code (DTC) for a 2001 Toyota Highlander indicates an issue with the Throttle Position Sensor/Switch 'A' Circuit registering a low input. Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Corrosion or poor connection at the TPS terminals. 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
P0122 2001 Toyota Highlander indicates Throttle Position Sensor/Switch 'A' Circuit Low Input.
Common causes
Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Corrosion or poor connection at the TPS terminals.
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 13, 2024
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Code P0122 2001 Toyota Highlander Description

The P0122 diagnostic trouble code (DTC) for a 2001 Toyota Highlander indicates an issue with the Throttle Position Sensor/Switch 'A' Circuit registering a low input. The throttle position sensor (TPS) is a crucial component of the vehicle's electronic control system, as it monitors the position of the throttle valve and sends this information to the engine control unit (ECU). The ECU uses this data to determine the appropriate air-fuel mixture for optimal engine performance and efficiency.

OBDII Code P0122 2001 Toyota Highlander - Throttle Position Sensor/Switch 'A' Circuit Low Input
P0122 2001 Toyota Highlander Code - Throttle Position Sensor/Switch 'A' Circuit Low Input

Common Causes of P0122 2001 Toyota Highlander

  1. Faulty throttle position sensor
  2. Damaged wiring or connectors in the TPS circuit
  3. Corrosion or poor connection at the TPS terminals
  4. Issues with the ECU or related components
  5. Environmental factors such as moisture or debris affecting the sensor

Symptoms of P0122 2001 Toyota Highlander

  1. Rough idling or unstable engine speed
  2. Hesitation or lack of response when accelerating
  3. Poor fuel economy
  4. Engine stalling or shutting off unexpectedly
  5. Illumination of the Check Engine Light

How to Fix P0122 2001 Toyota Highlander

  1. Begin by conducting a thorough inspection of the throttle position sensor, wiring, and connectors for any visible damage or corrosion.
  2. Test the TPS using a multimeter to check for proper voltage output within the specified range.
  3. If the TPS is found to be faulty, replace it with a new sensor following the manufacturer's guidelines.
  4. Clear the DTC codes from the ECU using a diagnostic scanner and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to identify any underlying issues with the ECU or related components.

Cost to Fix P0122 2001 Toyota Highlander

The typical repair costs for addressing a Throttle Position Sensor/Switch 'A' Circuit Low Input issue on a 2001 Toyota Highlander can range from $100 to $300, including parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour for labor, with rates potentially higher in metropolitan areas or at dealerships, and lower at independent shops. For a more accurate estimate, it is recommended to inquire about local rates before proceeding with the repair.

When is the Code Detected?

An excessively low voltage from the Throttle Position Sensor (TPS) is sent to Engine Control Module (ECM).

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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 P0122 2001 Toyota Highlander Code

1. What are the common symptoms of OBDII code P0122 in a 2001 Toyota Highlander?

- Common symptoms include poor acceleration, idling issues, stalling, and decreased fuel efficiency.

2. What does the OBDII code P0122 indicate in a 2001 Toyota Highlander?

- The code P0122 indicates a low input signal from the throttle position sensor/switch 'A' circuit.

3. What are the possible causes of OBDII code P0122 in a 2001 Toyota Highlander?

- Possible causes include a faulty throttle position sensor, damaged wiring or connectors, or a problem with the engine control module (ECM).

4. How can I diagnose the OBDII code P0122 in my 2001 Toyota Highlander?

- Diagnosis involves checking the throttle position sensor's voltage output, inspecting the wiring and connectors for damage, and testing the ECM for proper function.

5. Can I drive my 2001 Toyota Highlander with OBDII code P0122?

- It is not recommended to drive the vehicle with code P0122 as it can lead to performance issues and potential safety hazards.

6. How can I repair OBDII code P0122 in my 2001 Toyota Highlander?

- Repair options include replacing the throttle position sensor, repairing damaged wiring or connectors, or reprogramming the ECM.

7. What are some tips to prevent OBDII code P0122 in my 2001 Toyota Highlander?

- Regular maintenance, checking the throttle position sensor for wear, and addressing any engine performance issues promptly can help prevent code P0122.

8. Can I reset the OBDII code P0122 in my 2001 Toyota Highlander with a simple scan tool?

- While you can reset the code with a scan tool, it is important to address the underlying issue causing the code to prevent it from reoccurring.

9. How much does it typically cost to repair OBDII code P0122 in a 2001 Toyota Highlander?

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

10. Is it necessary to visit a mechanic for OBDII code P0122 in a 2001 Toyota Highlander, or can I fix it myself?

- Depending on your automotive knowledge and tools, you may be able to address the issue yourself by following repair guides or tutorials.

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