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Engine-Codes – Nissan – P0123 2011 Nissan Altima Sedan

P0123 2011 Nissan Altima Sedan Code - Throttle Position Sensor/Switch '1' Circuit High Input

Quick Answer

The P0123 diagnostic trouble code indicates that the engine control module (ECM) has detected a high voltage input from the throttle position sensor or switch. Common causes include Faulty Throttle Position Sensor: The TPS itself may be defective or failing, causing it to send incorrect voltage signals to the ECM, Wiring Issues: Damaged or corroded wiring connections between the TPS and ECM can disrupt the signal, leading to a high input code, ECM Malfunction: A malfunctioning ECM can misinterpret the signals from the TPS, causing it to register a high input. 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 2011 Nissan Altima Sedan indicates Throttle Position Sensor/Switch '1' Circuit High Input.
Common causes
Common causes include Faulty Throttle Position Sensor: The TPS itself may be defective or failing, causing it to send incorrect voltage signals to the ECM, Wiring Issues: Damaged or corroded wiring connections between the TPS and ECM can disrupt the signal, leading to a high input code, ECM Malfunction: A malfunctioning ECM can misinterpret the signals from the TPS, causing it to register a high input.
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 Aug 30, 2024
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Code P0123 2011 Nissan Altima Sedan Description

The P0123 diagnostic trouble code indicates that the engine control module (ECM) has detected a high voltage input from the throttle position sensor or switch. The throttle position sensor (TPS) is responsible for monitoring the position of the throttle valve and sending this information to the ECM. When the ECM receives a high voltage signal from the TPS, it can lead to incorrect fuel delivery and timing, resulting in poor engine performance, decreased fuel efficiency, and potential drivability issues.

OBDII Code P0123 2011 Nissan Altima Sedan - Throttle Position Sensor/Switch '1' Circuit High Input
P0123 2011 Nissan Altima Sedan Code - Throttle Position Sensor/Switch '1' Circuit High Input

Common Causes of P0123 2011 Nissan Altima Sedan

  1. Faulty Throttle Position Sensor: The TPS itself may be defective or failing, causing it to send incorrect voltage signals to the ECM.
  2. Wiring Issues: Damaged or corroded wiring connections between the TPS and ECM can disrupt the signal, leading to a high input code.
  3. ECM Malfunction: A malfunctioning ECM can misinterpret the signals from the TPS, causing it to register a high input.
  4. Throttle Body Issues: Problems with the throttle body, such as carbon buildup or a stuck throttle plate, can affect the TPS readings.
  5. Environmental Factors: Extreme temperatures, moisture, or contaminants can impact the TPS's performance and trigger a high input code.

Symptoms of P0123 2011 Nissan Altima Sedan

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
  2. Reduced Acceleration: The vehicle may experience hesitation or a lack of response when accelerating.
  3. Rough Idling: The engine may idle erratically or stall due to incorrect throttle position readings.
  4. Poor Fuel Efficiency: A malfunctioning throttle position sensor can lead to inefficient fuel delivery, resulting in decreased fuel economy.
  5. Harsh Shifting: Automatic transmission vehicles may exhibit harsh or delayed shifting patterns due to inaccurate throttle position data.

How to Fix P0123 2011 Nissan Altima Sedan

  1. Diagnostic Testing: Begin by using a scan tool to retrieve the trouble code and verify the high input from the TPS.
  2. TPS Replacement: Replace the throttle position sensor with a new, OEM-quality sensor to ensure accurate readings.
  3. Wiring Inspection: Inspect the wiring harness for any damage or corrosion, repairing or replacing any affected wires.
  4. Throttle Body Cleaning: Clean the throttle body to remove any carbon buildup or debris that may be affecting TPS performance.
  5. ECM Testing: If necessary, have the ECM tested to ensure it is functioning correctly and not causing the high input code.

Cost to Fix P0123 2011 Nissan Altima Sedan

The cost of repairing a throttle position sensor circuit high input issue can vary depending on the specific cause of the problem. In general, the cost of a new throttle position sensor can range from $50 to $200, with labor costs adding an additional $100 to $200. Overall, the total repair cost for this issue may range from $150 to $400. It's important to keep in mind that labor rates and parts prices can vary based on location and the specific vehicle make and model.

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 2011 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0123 (Throttle Position Sensor/Switch '1' Circuit High Input) in a 2011 Nissan Altima Sedan?

The common symptoms include issues with acceleration, an unresponsive throttle pedal, poor fuel economy, and possible stalling or surging of the engine.

2. What are the possible causes of OBDII code P0123 in a 2011 Nissan Altima Sedan?

The code P0123 is typically triggered by a faulty throttle position sensor, damaged wiring or connectors related to the sensor, or issues with the throttle control system.

3. How can I diagnose the cause of OBDII code P0123 in my 2011 Nissan Altima Sedan?

You can diagnose the issue by using an OBDII scanner to read the code, visually inspecting the throttle position sensor and its wiring for any damage, and performing a voltage test on the sensor.

4. Can I continue driving my 2011 Nissan Altima Sedan with OBDII code P0123 present?

It is not recommended to drive the vehicle with code P0123 as it can lead to further damage to the engine and affect the overall performance and safety of the vehicle.

5. What are some repair tips for fixing OBDII code P0123 in a 2011 Nissan Altima Sedan?

Repair tips include replacing the throttle position sensor if faulty, repairing or replacing damaged wiring or connectors, and ensuring proper installation and calibration of the new sensor.

6. How much does it typically cost to repair OBDII code P0123 in a 2011 Nissan Altima Sedan?

The cost of repairing code P0123 can vary depending on the extent of the damage and whether you choose to do the repairs yourself or take the vehicle to a mechanic. Costs can range from around $100 to $300 or more.

7. Can a DIY enthusiast fix OBDII code P0123 in a 2011 Nissan Altima Sedan?

Yes, if you have the necessary tools and experience, you can attempt to fix code P0123 yourself by following repair guides or tutorials specific to your vehicle.

8. Will resetting the OBDII code P0123 in my 2011 Nissan Altima Sedan make the problem go away?

Resetting the code will clear it temporarily, but if the underlying issue causing code P0123 is not addressed, the code is likely to reappear once the problem persists.

9. How long does it take to repair OBDII code P0123 in a 2011 Nissan Altima Sedan?

The repair time for code P0123 can vary based on the cause of the issue and your level of expertise. It can take anywhere from 30 minutes to a few hours to complete the repair.

10. Is it common for the throttle position sensor to fail in a 2011 Nissan Altima Sedan, triggering OBDII code P0123?

Yes, the throttle position sensor can be a common point of failure in vehicles, including the 2011 Nissan Altima Sedan, leading to the triggering of code P0123 due to wear and tear or electrical issues.

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