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Engine-Codes – Nissan – P0122 2009 Nissan Altima Sedan

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

Quick Answer

The OBD-II trouble code P0122 for a 2009 Nissan Altima Sedan indicates an issue with the Throttle Position Sensor/Switch 'A' Circuit, specifically a low input signal. Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Dirty throttle body. 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 Altima Sedan indicates Throttle Position Sensor/Switch 'A' Circuit Low Input.
Common causes
Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Dirty throttle body.
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 Altima Sedan Description

The OBD-II trouble code P0122 for a 2009 Nissan Altima Sedan indicates an issue with the Throttle Position Sensor/Switch 'A' Circuit, specifically a low input signal. The throttle position sensor (TPS) is a crucial component of the vehicle's electronic control 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 determine the appropriate air-fuel mixture for combustion, ignition timing, and other engine functions.

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

Common Causes of P0122 2009 Nissan Altima Sedan

  1. Faulty throttle position sensor
  2. Damaged wiring or connectors in the TPS circuit
  3. Dirty throttle body
  4. Malfunctioning ECM
  5. Corrosion or moisture in the sensor connections

Symptoms of P0122 2009 Nissan Altima Sedan

  1. Rough idling or stalling
  2. Poor acceleration or hesitation
  3. Decreased fuel efficiency
  4. Engine misfires
  5. Illuminated check engine light

How to Fix P0122 2009 Nissan Altima Sedan

  1. Begin by diagnosing the TPS using a multimeter to test for voltage output.
  2. Inspect the wiring and connectors for any damage or corrosion, repairing or replacing as necessary.
  3. Clean the throttle body to ensure smooth operation.
  4. If the TPS is found to be faulty, replace it with a new sensor.
  5. Clear the trouble code and perform a test drive to verify that the issue has been resolved.

Cost to Fix P0122 2009 Nissan Altima Sedan

The cost of repairing a Throttle Position Sensor/Switch 'A' Circuit Low Input issue on a 2009 Nissan Altima Sedan can vary depending on the specific cause of the problem. Generally, the cost of a new TPS sensor ranges from $50 to $150, while labor costs can range from $100 to $200. Overall, the total repair cost could fall between $150 and $350. However, it's important to note that prices may vary based on location, the shop's labor rates, and the quality of parts used. It's recommended to obtain quotes from local auto repair shops for a more accurate estimate.

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 Altima Sedan Code

1. What does OBDII code P0122 mean for a 2009 Nissan Altima Sedan?

The code P0122 indicates a potential issue with the Throttle Position Sensor/Switch 'A' Circuit, specifically a low input signal.

2. What are the common symptoms of OBDII code P0122 in a 2009 Nissan Altima Sedan?

Common symptoms include poor acceleration, rough idling, stalling, decreased fuel efficiency, and the Check Engine light illuminating on the dashboard.

3. What are the possible causes of OBDII code P0122 in a 2009 Nissan Altima Sedan?

Potential causes include a faulty throttle position sensor, damaged wiring or connectors in the sensor circuit, a disconnected or damaged throttle position sensor, or issues with the engine control module.

4. How can I diagnose the Throttle Position Sensor/Switch 'A' Circuit issue causing OBDII code P0122 in my 2009 Nissan Altima Sedan?

Diagnosing the problem involves using a scan tool to read the code, testing the throttle position sensor's voltage output, inspecting the sensor's wiring and connectors for any damage, and checking for any loose connections.

5. Can I still drive my 2009 Nissan Altima Sedan with OBDII code P0122 present?

It is not recommended to continue driving with the code present, as it can lead to further damage to the vehicle and potentially unsafe driving conditions. It's best to address the issue promptly.

6. How can I repair OBDII code P0122 in my 2009 Nissan Altima Sedan?

Repair options include replacing the throttle position sensor, repairing any damaged wiring or connectors, ensuring proper sensor installation, and clearing the code with a scan tool.

7. Are there any DIY tips for addressing OBDII code P0122 in a 2009 Nissan Altima Sedan?

While some basic troubleshooting steps can be done by DIY enthusiasts, it is recommended to consult a professional mechanic for accurate diagnosis and repair to ensure the issue is resolved effectively.

8. How much does it typically cost to repair OBDII code P0122 in a 2009 Nissan Altima Sedan?

The cost of repairing this code can vary depending on the specific cause of the issue, parts needed for replacement, and labor costs. It's advisable to obtain quotes from different automotive repair shops for an accurate estimate.

9. Can OBDII code P0122 in a 2009 Nissan Altima Sedan cause further damage if left unrepaired?

Continuing to drive with this code unresolved can potentially lead to reduced engine performance, increased fuel consumption, and other related issues. It's best to address the problem promptly to avoid further damage.

10. How long does it usually take to repair OBDII code P0122 in a 2009 Nissan Altima Sedan?

The repair time can vary based on the specific cause of the issue, availability of parts, and the workload of the mechanic. In general, the repair can range from a few hours to a full day, depending on the complexity of the problem.

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