Engine-Codes.com
Engine-Codes – Infiniti – P0123 2003 Infiniti G35

P0123 2003 Infiniti G35 Code - Throttle Position Sensor/Switch '1' Circuit High Input

Quick Answer

The P0123 code on a 2003 Infiniti G35 indicates a problem with the Throttle Position Sensor/Switch '1' Circuit, specifically a high input signal. Common causes include Faulty throttle position sensor, Wiring issues such as shorts or open circuits, Corrosion or poor connection at the TPS connector. 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
P0123 2003 Infiniti G35 indicates Throttle Position Sensor/Switch '1' Circuit High Input.
Common causes
Common causes include Faulty throttle position sensor, Wiring issues such as shorts or open circuits, Corrosion or poor connection at the TPS connector.
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
💬 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 P0123 2003 Infiniti G35 Description

The P0123 code on a 2003 Infiniti G35 indicates a problem with the Throttle Position Sensor/Switch '1' Circuit, specifically a high input signal. The throttle position sensor (TPS) is responsible for monitoring the position of the throttle valve, which determines how much air enters the engine. The TPS sends this information to the engine control module (ECM) to adjust fuel injection and ignition timing for optimal engine performance. When the ECM detects a high input signal from the TPS, it means that the voltage reading is outside of the expected range.

OBDII Code P0123 2003 Infiniti G35 - Throttle Position Sensor/Switch '1' Circuit High Input
P0123 2003 Infiniti G35 Code - Throttle Position Sensor/Switch '1' Circuit High Input

Common Causes of P0123 2003 Infiniti G35

  1. Faulty throttle position sensor
  2. Wiring issues such as shorts or open circuits
  3. Corrosion or poor connection at the TPS connector
  4. ECM software glitches or malfunctions
  5. Physical damage to the TPS from debris or wear and tear

Symptoms of P0123 2003 Infiniti G35

  1. Rough idling or erratic engine behavior
  2. Stalling or difficulty starting the vehicle
  3. Poor acceleration or response to throttle input
  4. Check Engine Light illuminated on the dashboard

How to Fix P0123 2003 Infiniti G35

  1. Begin by diagnosing the issue with a scan tool to confirm the P0123 code and pinpoint the exact cause.
  2. Inspect the TPS wiring and connector for any signs of damage, corrosion, or poor connections. Repair or replace as needed.
  3. Test the TPS voltage output using a multimeter to ensure it is within the manufacturer's specified range. Replace the TPS if readings are off.
  4. Clear the fault code from the ECM and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to identify any underlying issues with the ECM or other components.

Cost to Fix P0123 2003 Infiniti G35

The cost of repairing a Throttle Position Sensor/Switch '1' Circuit High Input issue on a 2003 Infiniti G35 can vary depending on the extent of the problem and the specific parts needed. On average, replacing a faulty TPS can cost between $100 to $300, including parts and labor. However, additional diagnostic time and repairs may increase the total cost. It's recommended to consult with a trusted mechanic or dealership for a more accurate estimate based on your vehicle's specific needs and location. Labor rates can range from $80 to $150 per hour, so it's advisable to inquire about local rates before proceeding with the repair.

When is the Code Detected?

An excessively high voltage from the Throttle Position Sensor (TPS) '1' is sent to Engine Control Module (ECM).

Need more information about the P0123 2003 Infiniti G35 code?

Need more information on how to fix the P0123 2003 Infiniti G35 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0123 2003 Infiniti G35 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 P0123 2003 Infiniti G35 Code

1. What are the common symptoms of OBDII code P0123 on a 2003 Infiniti G35?

Symptoms may include issues with acceleration, stalling, poor fuel economy, and an illuminated Check Engine Light.

2. What causes the Throttle Position Sensor/Switch '1' Circuit High Input code on a 2003 Infiniti G35?

The code is often triggered by a faulty throttle position sensor, damaged wiring, or a malfunction in the throttle control system.

3. How can I diagnose the cause of OBDII code P0123 on my 2003 Infiniti G35?

You can use a scan tool to check for the specific code, visually inspect the throttle position sensor and its wiring, and perform voltage tests to pinpoint the issue.

4. Can a dirty throttle body cause OBDII code P0123 on a 2003 Infiniti G35?

Yes, a dirty throttle body can disrupt the proper functioning of the throttle position sensor, leading to the code being triggered.

5. Is it safe to continue driving my 2003 Infiniti G35 with OBDII code P0123 present?

It is not recommended to drive with this code present, as it can lead to poor engine performance and potentially cause further damage over time.

6. How can I repair OBDII code P0123 on my 2003 Infiniti G35?

Repair options may include replacing the throttle position sensor, repairing damaged wiring, cleaning the throttle body, or addressing any other underlying issues identified during diagnosis.

7. Can resetting the ECU clear the Throttle Position Sensor/Switch '1' Circuit High Input code on a 2003 Infiniti G35?

Resetting the ECU may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return.

8. Will replacing the throttle position sensor fix OBDII code P0123 on a 2003 Infiniti G35?

In many cases, replacing the faulty throttle position sensor can resolve the issue, but it's important to diagnose the problem accurately to ensure a successful repair.

9. How much does it typically cost to repair OBDII code P0123 on a 2003 Infiniti G35?

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

10. Can a DIY enthusiast fix OBDII code P0123 on a 2003 Infiniti G35?

While some aspects of diagnosing and repairing this code can be tackled by a DIY enthusiast, it's recommended to have a professional mechanic perform the repairs to ensure accurate diagnosis and a proper fix.

Discuss the causes and fixes for P0123 2003 Infiniti G35 OBDII Code

Submit a New Comment

Code P0123 2003 Infiniti G35 comments

No comments found for this page.