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Engine-Codes – Toyota – P0122 2005 Toyota Highlander

P0122 2005 Toyota Highlander Code - Throttle Position Sensor/Switch 'A' Circuit Low Input

Quick Answer

The P0122 diagnostic trouble code (DTC) for a 2005 Toyota Highlander indicates an issue with the Throttle Position Sensor/Switch 'A' Circuit registering a low input signal. Common causes include Faulty throttle position sensor, Wiring issues or a poor connection in the TPS circuit, Corrosion or contamination affecting the TPS signal. 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 2005 Toyota Highlander indicates Throttle Position Sensor/Switch 'A' Circuit Low Input.
Common causes
Common causes include Faulty throttle position sensor, Wiring issues or a poor connection in the TPS circuit, Corrosion or contamination affecting the TPS signal.
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 12, 2024
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Code P0122 2005 Toyota Highlander Description

The P0122 diagnostic trouble code (DTC) for a 2005 Toyota Highlander indicates an issue with the Throttle Position Sensor/Switch 'A' Circuit registering a low input signal. The throttle position sensor (TPS) is a crucial component of the vehicle's electronic fuel injection system, as it monitors the position of the throttle valve and sends this information to the engine control module (ECM). The ECM uses this data to adjust fuel delivery and ignition timing, optimizing engine performance and fuel efficiency.

OBDII Code P0122 2005 Toyota Highlander - Throttle Position Sensor/Switch 'A' Circuit Low Input
P0122 2005 Toyota Highlander Code - Throttle Position Sensor/Switch 'A' Circuit Low Input

Common Causes of P0122 2005 Toyota Highlander

  1. Faulty throttle position sensor.
  2. Wiring issues or a poor connection in the TPS circuit.
  3. Corrosion or contamination affecting the TPS signal.
  4. ECM software or hardware malfunction.
  5. Mechanical issues with the throttle body or throttle plate.

Symptoms of P0122 2005 Toyota Highlander

  1. Poor acceleration or lack of response when pressing the gas pedal.
  2. Rough idling or stalling when the vehicle is at a stop.
  3. Decreased fuel efficiency and increased fuel consumption.
  4. Hesitation or surging during acceleration.
  5. Illumination of the Check Engine Light on the dashboard.

How to Fix P0122 2005 Toyota Highlander

  1. Begin by conducting a thorough inspection of the throttle position sensor and its wiring harness for any visible damage, corrosion, or loose connections.
  2. Test the TPS using a multimeter to check for proper voltage output and resistance within the expected range.
  3. If the TPS is faulty, replace it with a new sensor following manufacturer's guidelines.
  4. Clear the DTC using a scan tool and perform a test drive to ensure the code does not return.
  5. If the issue persists, further diagnostic testing may be required to identify any underlying wiring or ECM issues.

Cost to Fix P0122 2005 Toyota Highlander

The cost of repairing a P0122 code on a 2005 Toyota Highlander can vary depending on the specific cause of the issue and the labor rates in your area. Generally, replacing a throttle position sensor can range from $100 to $200 for the part, with additional labor costs of approximately $100 to $200. Overall, you can expect to pay anywhere from $200 to $400 for this repair at a typical auto repair shop. Keep in mind that prices may fluctuate based on location, vehicle make and model, and any additional components that may need to be replaced. It's recommended to obtain a detailed quote from a trusted mechanic to get an accurate estimate for your specific situation.

When is the Code Detected?

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

Need more information about the P0122 2005 Toyota Highlander code?

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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 2005 Toyota Highlander Code

1. What does OBDII code P0122 on a 2005 Toyota Highlander mean?

The code P0122 indicates a problem with the Throttle Position Sensor/Switch 'A' Circuit Low Input.

2. What are the common symptoms of OBDII code P0122 in a 2005 Toyota Highlander?

Common symptoms include poor acceleration, stalling, rough idling, and potentially decreased fuel efficiency.

3. What are the possible causes of OBDII code P0122 in a 2005 Toyota Highlander?

Potential causes include a faulty throttle position sensor, damaged wiring or connectors, a malfunctioning throttle body, or issues with the engine control module.

4. How can I diagnose the Throttle Position Sensor/Switch 'A' Circuit Low Input issue in my 2005 Toyota Highlander?

Diagnosis typically involves using an OBDII scanner to read the code, testing the throttle position sensor with a multimeter, and inspecting the sensor's wiring and connectors for damage.

5. Can I still drive my 2005 Toyota Highlander with OBDII code P0122?

It is not recommended to drive your vehicle with code P0122 as it can lead to performance issues and potential safety hazards. It's best to address the problem promptly.

6. How can I repair OBDII code P0122 in a 2005 Toyota Highlander?

Repair options may include replacing the throttle position sensor, repairing damaged wiring or connectors, cleaning the throttle body, or resetting the engine control module.

7. Is it possible to reset OBDII code P0122 in a 2005 Toyota Highlander without fixing the underlying issue?

Resetting the code without addressing the root cause is not recommended, as the problem will likely persist and could lead to further issues down the line.

8. Can a DIY enthusiast fix OBDII code P0122 in a 2005 Toyota Highlander?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair P0122 themselves. However, professional help may be needed for more complex issues.

9. How much does it cost to repair OBDII code P0122 in a 2005 Toyota Highlander?

The cost of repairs can vary depending on the specific cause of the issue and whether you choose to do the repairs yourself or seek professional help. Costs may range from a few dollars for simple fixes to a few hundred dollars for more complex repairs.

10. Will OBDII code P0122 in a 2005 Toyota Highlander cause the check engine light to illuminate?

Yes, code P0122 will trigger the check engine light to come on in your 2005 Toyota Highlander. It is important to address the underlying issue to prevent further damage to your vehicle.

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