AutoCodes – Toyota – P0122 2003 Toyota Highlander

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

Quick Answer

The Throttle Pedal Position (TPP) responds to the accelerator pedal movement. Common causes include Faulty throttle position sensor, Throttle position sensor harness is open or shorted, Throttle position sensor circuit poor electrical connection. 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, Throttle position sensor harness is open or shorted, Throttle position sensor circuit poor electrical connection.
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.

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Code Popularity 3,263

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0122 2003 Toyota Highlander Description

The Throttle Pedal Position (TPP) responds to the accelerator pedal movement. This sensor is a kind of potentiometer which transforms the throttle position into output voltage, and emits the voltage signal to the Engine Control Module (ECM). In addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal to the ECM.
Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sensor. This sensor controls engine operation such as fuel cut. On the other hand, the Wide open and closed throttle position switch, which is built into the throttle position sensor unit, is not used for engine control.

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

What does this mean?

What are the Possible Causes of the DTC P0122 2003 Toyota Highlander?

Faulty throttle position sensor
Throttle position sensor harness is open or shorted
Throttle position sensor circuit poor electrical connection

How to Fix the DTC P0122 2003 Toyota Highlander?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0122 2003 Toyota Highlander code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0122 2003 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 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.