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Engine-Codes – Nissan – P0123 2009 Nissan Altima Sedan

P0123 2009 Nissan Altima Sedan Code - Throttle Position Sensor/Switch '1' Circuit High Input

Quick Answer

The P0123 code for a 2009 Nissan Altima Sedan indicates a problem with the Throttle Position Sensor/Switch '1' Circuit High Input. Common causes include Faulty throttle position sensor, Wiring issues (short circuits, open circuits), Corroded 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 2009 Nissan Altima Sedan indicates Throttle Position Sensor/Switch '1' Circuit High Input.
Common causes
Common causes include Faulty throttle position sensor, Wiring issues (short circuits, open circuits), Corroded 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 11, 2024
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Code P0123 2009 Nissan Altima Sedan Description

The P0123 code for a 2009 Nissan Altima Sedan indicates a problem with the Throttle Position Sensor/Switch '1' Circuit High Input. This sensor is crucial for the engine control unit (ECU) to determine the correct amount of air entering the engine, which affects fuel delivery and ignition timing. The throttle position sensor (TPS) sends voltage signals to the ECU based on the position of the throttle pedal, allowing the ECU to adjust the engine performance accordingly.

OBDII Code P0123 2009 Nissan Altima Sedan - Throttle Position Sensor/Switch '1' Circuit High Input
P0123 2009 Nissan Altima Sedan Code - Throttle Position Sensor/Switch '1' Circuit High Input

Common Causes of P0123 2009 Nissan Altima Sedan

  1. Faulty throttle position sensor
  2. Wiring issues (short circuits, open circuits)
  3. Corroded connector
  4. Damaged ECU

Symptoms of P0123 2009 Nissan Altima Sedan

  1. Reduced engine power
  2. Poor fuel efficiency
  3. Rough idling
  4. Hesitation during acceleration
  5. Engine misfires

How to Fix P0123 2009 Nissan Altima Sedan

  1. Begin by diagnosing the issue using a scan tool to confirm the P0123 code and check for any related codes.
  2. Inspect the throttle position sensor, wiring harness, and connector for any visible damage or corrosion.
  3. Test the throttle position sensor using a multimeter to ensure it is within the specified voltage range.
  4. If the sensor is faulty, replace it with a new one following the manufacturer's instructions.
  5. Clear the fault codes and perform a test drive to ensure the issue has been resolved.

Cost to Fix P0123 2009 Nissan Altima Sedan

The cost of repairing a P0123 code on a 2009 Nissan Altima Sedan can vary depending on the specific cause of the issue. On average, the cost of replacing a throttle position sensor can range from $50 to $200, excluding labor costs. The total repair cost, including parts and labor, may range from $150 to $400. However, it is essential to note that labor rates and part prices can vary significantly based on the location, auto repair shop, and specific vehicle model. It is advisable to consult with a professional mechanic for a more accurate cost estimate.

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 2009 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0123 in a 2009 Nissan Altima Sedan?

- Common symptoms include poor acceleration, hesitation, rough idling, and potentially stalling of the vehicle.

2. What could cause the Throttle Position Sensor/Switch '1' Circuit High Input code (P0123) in a 2009 Nissan Altima Sedan?

- The code is usually triggered by a faulty throttle position sensor, damaged wiring or connectors, or a problem with the engine control module.

3. How can I diagnose the cause of OBDII code P0123 in my 2009 Nissan Altima Sedan?

- You can use a scan tool to read the code and then test the throttle position sensor for proper voltage signals. Check the wiring and connectors for any damage or corrosion.

4. Can I continue driving my 2009 Nissan Altima Sedan with the P0123 code present?

- It is not recommended to continue driving with this code as it can lead to poor engine performance and potential safety hazards. It's best to address the issue promptly.

5. How can I repair OBDII code P0123 in my 2009 Nissan Altima Sedan?

- The most common repair involves replacing the throttle position sensor. Ensure proper installation and check the wiring and connectors for any issues.

6. Are there any DIY tips for fixing the Throttle Position Sensor/Switch '1' Circuit High Input code in a 2009 Nissan Altima Sedan?

- While replacing the throttle position sensor is straightforward, ensure you have the right tools and follow the manufacturer's instructions. Double-check all connections post-repair.

7. Will resetting the OBDII code P0123 in my 2009 Nissan Altima Sedan make it go away permanently?

- Resetting the code may clear it temporarily, but if the underlying issue causing the code is not addressed, it is likely to return. It's essential to diagnose and fix the root cause.

8. Is it safe to drive my 2009 Nissan Altima Sedan if the throttle position sensor is malfunctioning?

- Driving with a malfunctioning throttle position sensor can affect the vehicle's performance and fuel efficiency. It's best to address the issue promptly to avoid potential safety risks.

9. Can extreme weather conditions cause the Throttle Position Sensor/Switch '1' Circuit High Input code in a 2009 Nissan Altima Sedan?

- While extreme weather alone may not cause this specific code, it can exacerbate existing issues with the throttle position sensor or related components due to temperature fluctuations.

10. How much can I expect to pay for repairing OBDII code P0123 in my 2009 Nissan Altima Sedan at a professional mechanic or dealership?

- The cost of repairing this code can vary depending on the labor rates and parts prices, but it typically ranges from $150 to $300 for parts and labor.

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