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P0123 2004 Nissan Maxima Code - Throttle Position Sensor/Switch '1' Circuit High Input

Quick Answer

The OBD-II trouble code P0123 for a 2004 Nissan Maxima refers to an issue with the Throttle Position Sensor/Switch '1' Circuit High Input. Common causes include Faulty TPS: A malfunctioning throttle position sensor can send incorrect voltage signals to the ECM, triggering the P0123 code, Wiring issues: Damaged or corroded wiring connecting the TPS to the ECM can disrupt the voltage signal and lead to a high input error, ECM malfunction: A problem with the engine control module itself can cause erroneous readings from the TPS. 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 2004 Nissan Maxima indicates Throttle Position Sensor/Switch '1' Circuit High Input.
Common causes
Common causes include Faulty TPS: A malfunctioning throttle position sensor can send incorrect voltage signals to the ECM, triggering the P0123 code, Wiring issues: Damaged or corroded wiring connecting the TPS to the ECM can disrupt the voltage signal and lead to a high input error, ECM malfunction: A problem with the engine control module itself can cause erroneous readings from the TPS.
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 P0123 2004 Nissan Maxima Description

The OBD-II trouble code P0123 for a 2004 Nissan Maxima refers to an issue with the Throttle Position Sensor/Switch '1' Circuit High Input. The throttle position sensor (TPS) is a crucial component of the engine management 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 for optimal engine performance.

OBDII Code P0123 2004 Nissan Maxima - Throttle Position Sensor/Switch '1' Circuit High Input
P0123 2004 Nissan Maxima Code - Throttle Position Sensor/Switch '1' Circuit High Input

Common Causes of P0123 2004 Nissan Maxima

  1. Faulty TPS: A malfunctioning throttle position sensor can send incorrect voltage signals to the ECM, triggering the P0123 code.
  2. Wiring issues: Damaged or corroded wiring connecting the TPS to the ECM can disrupt the voltage signal and lead to a high input error.
  3. ECM malfunction: A problem with the engine control module itself can cause erroneous readings from the TPS.
  4. Dirty throttle body: A buildup of carbon deposits or dirt on the throttle body can interfere with the TPS operation and trigger the code.

Symptoms of P0123 2004 Nissan Maxima

  1. Reduced engine power: The ECM may limit the engine power output to prevent damage due to incorrect throttle position readings.
  2. Unresponsive throttle: The vehicle may hesitate or fail to accelerate properly when the throttle is applied.
  3. Poor fuel efficiency: Incorrect throttle position readings can lead to inefficient fuel delivery, resulting in decreased fuel economy.
  4. Check Engine Light: The illumination of the Check Engine Light is a common symptom of this code being triggered.

How to Fix P0123 2004 Nissan Maxima

  1. Diagnostic scan: Use an OBD-II scanner to read the trouble codes and confirm the presence of P0123.
  2. Inspect TPS wiring: Check the wiring harness for any signs of damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test TPS operation: Use a multimeter to measure the voltage output of the TPS at various throttle positions. Replace the TPS if readings are out of specification.
  4. Clean throttle body: Remove any dirt or carbon buildup from the throttle body using a throttle body cleaner.
  5. Reset ECM: Clear the trouble codes with the OBD-II scanner and perform a throttle position sensor relearn procedure to calibrate the TPS.

Cost to Fix P0123 2004 Nissan Maxima

The cost estimate for resolving the Throttle Position Sensor/Switch '1' Circuit High Input issue on a 2004 Nissan Maxima can vary depending on the specific cause of the problem. Generally, replacing a faulty TPS can cost between $50 and $200, while addressing wiring issues or cleaning the throttle body may require additional labor charges. Overall, the total repair cost could range from $100 to $500, including parts and labor. It's advisable to consult a professional mechanic for an accurate diagnosis and cost estimate, as rates can differ based on location and service provider.

When is the Code Detected?

An excessively high voltage from the Throttle Position Sensor (TPS) '1' 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 P0123 2004 Nissan Maxima Code

1. What are common symptoms of OBDII code P0123 in a 2004 Nissan Maxima?

Symptoms may include issues with acceleration, rough idling, stalling, poor fuel economy, and the vehicle going into "limp mode."

2. What does the OBDII code P0123 indicate in a 2004 Nissan Maxima?

Code P0123 points to an issue with the Throttle Position Sensor/Switch '1' Circuit, specifically indicating a high input signal from the sensor.

3. What are possible causes of OBDII code P0123 in a 2004 Nissan Maxima?

Potential causes can include a faulty throttle position sensor, damaged wiring or connectors in the circuit, a defective PCM, or a misaligned throttle position sensor.

4. How can I diagnose the Throttle Position Sensor/Switch '1' Circuit issue in my 2004 Nissan Maxima?

You can use a multimeter to test the throttle position sensor's voltage output, inspect the wiring and connectors for any damage, and check for proper sensor alignment.

5. Can I drive my 2004 Nissan Maxima with OBDII code P0123?

It is not recommended to drive the vehicle with this code present, as it can lead to poor performance and potential safety hazards due to erratic throttle response.

6. How can I repair OBDII code P0123 in my 2004 Nissan Maxima?

Repair options include replacing the throttle position sensor, repairing any damaged wiring or connectors, realigning the sensor, or seeking professional help for further diagnosis.

7. Is it safe to reset the OBDII code P0123 in a 2004 Nissan Maxima?

While you can reset the code using an OBDII scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. Will OBDII code P0123 cause my 2004 Nissan Maxima to fail an emissions test?

Yes, having this code present can cause your vehicle to fail an emissions test due to the impact it has on engine performance and emissions control systems.

9. How much does it typically cost to repair OBDII code P0123 in a 2004 Nissan Maxima?

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

10. Can a DIY enthusiast fix OBDII code P0123 in a 2004 Nissan Maxima?

Depending on the individual's skill level and access to tools, DIY enthusiasts may be able to address this issue by following repair guides and using proper diagnostic equipment.

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