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P0122 2003 Toyota Highlander Code - Throttle Position Sensor/Switch 'A' Circuit Low Input

Quick Answer

The OBD-II trouble code P0122 for a 2003 Toyota Highlander indicates a problem with the Throttle Position Sensor/Switch 'A' Circuit Low Input. Common causes include Faulty throttle position sensor, Damaged or deteriorated wiring in the TPS circuit, Corrosion or poor connections in the TPS wiring harness. 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 2003 Toyota Highlander indicates Throttle Position Sensor/Switch 'A' Circuit Low Input.
Common causes
Common causes include Faulty throttle position sensor, Damaged or deteriorated wiring in the TPS circuit, Corrosion or poor connections in the TPS wiring harness.
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 10, 2024
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Code P0122 2003 Toyota Highlander Description

The OBD-II trouble code P0122 for a 2003 Toyota Highlander indicates a problem with the Throttle Position Sensor/Switch 'A' Circuit Low Input. The throttle position sensor (TPS) is a crucial component of the vehicle's electronic control system that monitors the position of the throttle blade. The TPS provides data to the engine control module (ECM) to determine the appropriate air-fuel mixture for efficient combustion and optimal performance.

OBDII Code P0122 2003 Toyota Highlander - Throttle Position Sensor/Switch 'A' Circuit Low Input
P0122 2003 Toyota Highlander Code - Throttle Position Sensor/Switch 'A' Circuit Low Input

Common Causes of P0122 2003 Toyota Highlander

  1. Faulty throttle position sensor
  2. Damaged or deteriorated wiring in the TPS circuit
  3. Corrosion or poor connections in the TPS wiring harness
  4. ECM malfunction or software issues
  5. Environmental factors such as moisture or debris affecting the TPS

Symptoms of P0122 2003 Toyota Highlander

  1. Poor acceleration or sluggish throttle response
  2. Engine hesitation or surging
  3. Rough idling or stalling
  4. Check engine light illuminated on the dashboard
  5. Reduced fuel efficiency

How to Fix P0122 2003 Toyota Highlander

  1. Begin by diagnosing the TPS circuit using a scan tool to confirm the P0122 code and check for any related codes.
  2. Inspect the throttle position sensor and its wiring harness for any visible damage, corrosion, or loose connections.
  3. Test the TPS using a multimeter to verify its resistance values and functionality.
  4. If the TPS is faulty, replace it with a new OEM or high-quality aftermarket sensor.
  5. Clear the trouble codes from the ECM and perform a test drive to ensure the issue has been resolved.

Cost to Fix P0122 2003 Toyota Highlander

The typical repair costs for addressing a P0122 code on a 2003 Toyota Highlander can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor. This estimate includes the price of a new throttle position sensor, diagnostic fees, and the labor cost for the repair. It's important to note that labor rates at auto repair shops can vary, so it's advisable to obtain quotes from multiple sources to ensure a competitive price. Additionally, factors such as the location of the repair shop and the vehicle's make and model can influence the final cost.

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 2003 Toyota Highlander Code

1. What are common symptoms of OBDII code P0122 in a 2003 Toyota Highlander?

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

2. What does the OBDII code P0122 in a 2003 Toyota Highlander indicate?

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

3. What are possible causes of OBDII code P0122 in a 2003 Toyota Highlander?

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

4. How can I diagnose the cause of OBDII code P0122 in my 2003 Toyota Highlander?

- You can use a multimeter to test the throttle position sensor for proper voltage output and check the wiring and connectors for any damage or corrosion.

5. Can I drive my 2003 Toyota Highlander with OBDII code P0122?

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

6. How can I repair OBDII code P0122 in my 2003 Toyota Highlander?

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

7. Is it possible to reset OBDII code P0122 in a 2003 Toyota Highlander without fixing the underlying issue?

- While you can clear the code with a diagnostic tool, it will likely reappear if the root cause is not addressed.

8. Can a DIY enthusiast fix OBDII code P0122 in a 2003 Toyota Highlander?

- Depending on your skill level and tools available, you may be able to replace the throttle position sensor or check the wiring yourself. Otherwise, professional help is recommended.

9. How much does it cost to repair OBDII code P0122 in a 2003 Toyota Highlander?

- The cost can vary depending on the specific issue, but replacing the throttle position sensor or repairing wiring typically ranges from $100 to $300 at a repair shop.

10. How often does OBDII code P0122 occur in 2003 Toyota Highlanders?

- OBDII code P0122 can occur in 2003 Toyota Highlanders due to age-related sensor wear or electrical issues, but it is not considered a common problem.

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