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Engine-Codes – Nissan – P0122 2012 Nissan Sentra

P0122 2012 Nissan Sentra Code - Throttle Position Sensor/Switch 'A' Circuit Low Input

Quick Answer

The diagnostic trouble code P0122 for a 2012 Nissan Sentra indicates an issue with the Throttle Position Sensor/Switch 'A' Circuit having a low input signal. Common causes include Faulty Throttle Position Sensor, Damaged or corroded wiring/connectors leading to the sensor, Short circuits in the TPS circuit. 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 2012 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 leading to the sensor, Short circuits in the TPS circuit.
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 12, 2024
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Code P0122 2012 Nissan Sentra Description

The diagnostic trouble code P0122 for a 2012 Nissan Sentra indicates an issue with the Throttle Position Sensor/Switch 'A' Circuit having a low input signal. The Throttle Position Sensor (TPS) is a crucial component in the vehicle's fuel 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 adjust the air-fuel mixture for optimal engine performance. When the TPS reports a low input signal, it means that the voltage signal from the sensor is below the expected range, which can lead to various performance issues.

OBDII Code P0122 2012 Nissan Sentra - Throttle Position Sensor/Switch 'A' Circuit Low Input
P0122 2012 Nissan Sentra Code - Throttle Position Sensor/Switch 'A' Circuit Low Input

Common Causes of P0122 2012 Nissan Sentra

  1. Faulty Throttle Position Sensor
  2. Damaged or corroded wiring/connectors leading to the sensor
  3. Short circuits in the TPS circuit
  4. Issues with the electronic control module (ECM)
  5. Contamination or build-up affecting TPS performance

Symptoms of P0122 2012 Nissan Sentra

  1. Poor acceleration and throttle response
  2. Engine stalling or surging
  3. Rough idling or fluctuations in engine speed
  4. Reduced fuel efficiency
  5. Illumination of the Check Engine Light

How to Fix P0122 2012 Nissan Sentra

  1. Begin by diagnosing the root cause of the issue by using a diagnostic scanner to retrieve the trouble codes and testing the Throttle Position Sensor for proper voltage output.
  2. Inspect the wiring harness and connectors for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  3. If the TPS is determined to be faulty, replace it with a new OEM or high-quality aftermarket sensor. Calibrate the new sensor according to manufacturer specifications.
  4. Clear the diagnostic trouble codes from the ECU's memory using the scanner and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnostic tests may be required to identify any underlying issues with the ECM or other related components.

Cost to Fix P0122 2012 Nissan Sentra

The typical cost for repairing a Throttle Position Sensor/Switch 'A' Circuit Low Input issue on a 2012 Nissan Sentra can range from $150 to $300 for parts and labor. This estimate includes the cost of a new TPS sensor, any necessary wiring repairs, and the labor involved in diagnosing and fixing the problem. However, it's important to note that repair costs can vary based on the location of the repair shop, the specific diagnosis time required, and the hourly labor rates. It's recommended to obtain quotes from multiple auto repair shops to ensure a competitive price for the repair.

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 2012 Nissan Sentra Code

1. What are the common symptoms of OBDII code P0122 in a 2012 Nissan Sentra?

The common symptoms of code P0122 in a 2012 Nissan Sentra include reduced engine power, hesitation or stalling when accelerating, and issues with the vehicle's idle speed.

2. What does the OBDII code P0122 indicate in a 2012 Nissan Sentra?

Code P0122 in a 2012 Nissan Sentra indicates a Throttle Position Sensor/Switch 'A' Circuit Low Input, which means the voltage signal from the throttle position sensor is lower than expected.

3. What are the possible causes of OBDII code P0122 in a 2012 Nissan Sentra?

The possible causes of code P0122 in a 2012 Nissan Sentra include a faulty throttle position sensor, damaged wiring or connectors in the throttle position sensor circuit, or a problem with the vehicle's Engine Control Module (ECM).

4. How can I diagnose the OBDII code P0122 in my 2012 Nissan Sentra?

To diagnose code P0122 in a 2012 Nissan Sentra, you can use an OBDII scanner to read the code, visually inspect the throttle position sensor and its wiring, conduct voltage tests on the sensor, and check for any related issues in the ECM.

5. Can I drive my 2012 Nissan Sentra with OBDII code P0122?

It is not recommended to drive your 2012 Nissan Sentra with code P0122, as it can lead to further damage to the engine and affect the vehicle's performance. It is best to address the issue promptly.

6. How can I repair OBDII code P0122 in my 2012 Nissan Sentra?

To repair code P0122 in a 2012 Nissan Sentra, you may need to replace the throttle position sensor, repair any damaged wiring or connectors, or reprogram the ECM if necessary. It's advisable to consult a professional mechanic for accurate diagnosis and repair.

7. Is it possible to reset OBDII code P0122 in a 2012 Nissan Sentra without fixing the underlying issue?

Resetting the OBDII code P0122 in a 2012 Nissan Sentra without fixing the underlying issue will only temporarily clear the code. The problem causing the code will persist, and the code is likely to reappear after some driving cycles.

8. How much does it typically cost to repair OBDII code P0122 in a 2012 Nissan Sentra?

The cost to repair code P0122 in a 2012 Nissan Sentra can vary depending on the root cause of the issue. Replacement of the throttle position sensor or repairs to the wiring may cost anywhere from $100 to $300, including parts and labor.

9. Can a DIY enthusiast fix OBDII code P0122 in a 2012 Nissan Sentra?

While some DIY enthusiasts may have the skills to replace the throttle position sensor or repair wiring issues related to code P0122 in a 2012 Nissan Sentra, it is recommended to seek professional help for an accurate diagnosis and proper repair.

10. How urgent is it to address OBDII code P0122 in a 2012 Nissan Sentra?

It is important to address OBDII code P0122 in a 2012 Nissan Sentra as soon as possible to prevent further damage to the vehicle and ensure optimal performance. Ignoring this code can lead to drivability issues and potentially unsafe driving conditions.

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