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P0122 2009 Nissan Sentra Code - Throttle Position Sensor/Switch 'A' Circuit Low Input

Quick Answer

The OBD-II trouble code P0122 in a 2009 Nissan Sentra indicates a problem with the Throttle Position Sensor/Switch 'A' Circuit, specifically a low input signal. Common causes include Faulty throttle position sensor, Damaged or corroded wiring/connectors in the TPS circuit, Malfunctioning ECU. 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 2009 Nissan Sentra indicates Throttle Position Sensor/Switch 'A' Circuit Low Input.
Common causes
Common causes include Faulty throttle position sensor, Damaged or corroded wiring/connectors in the TPS circuit, Malfunctioning ECU.
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 15, 2024
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Code P0122 2009 Nissan Sentra Description

The OBD-II trouble code P0122 in a 2009 Nissan Sentra indicates a problem with the Throttle Position Sensor/Switch 'A' Circuit, specifically a low input signal. 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 unit (ECU). The ECU uses this data to determine the appropriate air-fuel mixture for combustion and adjust the engine performance accordingly.

OBDII Code P0122 2009 Nissan Sentra - Throttle Position Sensor/Switch 'A' Circuit Low Input
P0122 2009 Nissan Sentra Code - Throttle Position Sensor/Switch 'A' Circuit Low Input

Common Causes of P0122 2009 Nissan Sentra

  1. Faulty throttle position sensor.
  2. Damaged or corroded wiring/connectors in the TPS circuit.
  3. Malfunctioning ECU.
  4. Vacuum leak affecting throttle body operation.
  5. Mechanical issues with the throttle body.

Symptoms of P0122 2009 Nissan Sentra

  1. Reduced engine power and acceleration.
  2. Rough idling or stalling at idle.
  3. Poor fuel efficiency.
  4. Check Engine Light illuminated on the dashboard.
  5. Difficulty starting the engine.

How to Fix P0122 2009 Nissan Sentra

  1. Begin by connecting a diagnostic scanner to retrieve the trouble codes and confirm P0122.
  2. Inspect the throttle position sensor and its wiring for any visible damage or corrosion.
  3. Test the TPS using a multimeter to check for proper voltage output.
  4. Replace the throttle position sensor if it fails the voltage test.
  5. Clear the trouble codes and perform a test drive to ensure the issue has been resolved.

Cost to Fix P0122 2009 Nissan Sentra

The cost of repairing a Throttle Position Sensor/Switch 'A' Circuit Low Input issue in a 2009 Nissan Sentra can vary depending on the specific cause of the problem. On average, replacing a faulty throttle position sensor can cost between $100 and $200 for the part alone. Labor costs at an auto repair shop can range from $100 to $200, with total repair costs typically falling between $200 and $400. It's important to note that prices may vary based on location, the shop's labor rates, and any additional components that may need to be replaced. It's recommended to obtain quotes from multiple repair facilities to find the best price for the necessary repairs.

When is the Code Detected?

An excessively low voltage from the Throttle Position Sensor (TPS) 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 P0122 2009 Nissan Sentra Code

1. What are the common symptoms of OBDII code P0122 on a 2009 Nissan Sentra?

The common symptoms of OBDII code P0122 on a 2009 Nissan Sentra include poor acceleration, rough idling, stalling, and in some cases, the vehicle may go into limp mode.

2. What does the OBDII code P0122 on a 2009 Nissan Sentra indicate?

OBDII code P0122 indicates a low input signal from the throttle position sensor or switch 'A' circuit on a 2009 Nissan Sentra.

3. What are the possible causes of OBDII code P0122 on a 2009 Nissan Sentra?

Possible causes of OBDII code P0122 on a 2009 Nissan Sentra include a faulty throttle position sensor, damaged wiring or connectors in the throttle position sensor circuit, or a problem with the engine control module.

4. How can I diagnose the OBDII code P0122 on a 2009 Nissan Sentra?

To diagnose OBDII code P0122 on a 2009 Nissan Sentra, you can use a scan tool to check for any additional trouble codes, inspect the throttle position sensor and its wiring for damage, and test the sensor's voltage output.

5. Can I drive my 2009 Nissan Sentra with OBDII code P0122?

It is not recommended to drive your 2009 Nissan Sentra with OBDII code P0122, as it can lead to poor engine performance, stalling, or other safety issues. It is best to address the issue promptly.

6. How can I repair OBDII code P0122 on a 2009 Nissan Sentra?

To repair OBDII code P0122 on a 2009 Nissan Sentra, you may need to replace the throttle position sensor, repair damaged wiring or connectors, or reprogram the engine control module if necessary.

7. Is it possible to reset OBDII code P0122 on a 2009 Nissan Sentra?

Resetting OBDII code P0122 on a 2009 Nissan Sentra may temporarily clear the code, but it is essential to address the underlying issue causing the code to prevent it from reoccurring.

8. Can a DIY enthusiast fix OBDII code P0122 on a 2009 Nissan Sentra?

A DIY enthusiast may be able to fix OBDII code P0122 on a 2009 Nissan Sentra if they have the necessary tools, knowledge, and skills to diagnose and repair the issue with the throttle position sensor or its circuit.

9. How much does it cost to repair OBDII code P0122 on a 2009 Nissan Sentra?

The cost to repair OBDII code P0122 on a 2009 Nissan Sentra can vary depending on the root cause of the issue, parts needed, and labor costs. It is recommended to consult a professional mechanic for an accurate estimate.

10. Will OBDII code P0122 on a 2009 Nissan Sentra affect fuel efficiency?

Yes, OBDII code P0122 on a 2009 Nissan Sentra can affect fuel efficiency due to improper throttle position readings impacting the engine's performance and fuel delivery. Addressing the issue promptly can help restore optimal fuel efficiency.

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