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Engine-Codes – Nissan – P0122 2003 Nissan Altima Sedan

P0122 2003 Nissan Altima Sedan Code - Throttle Position Sensor/Switch '1' Circuit Low Input

Quick Answer

The P0122 code indicates a low input signal from the Throttle Position Sensor (TPS) or switch '1' circuit in a 2003 Nissan Altima. Common causes include Faulty Throttle Position Sensor: The most common cause is a malfunctioning TPS that fails to send the correct voltage signal to the ECM, Wiring Issues: Damaged, frayed, or corroded wiring in the TPS circuit can lead to poor connectivity and low input signals, Poor Electrical Connections: Loose or corroded connectors can disrupt the signal transmission between the TPS and the ECM. 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 2003 Nissan Altima Sedan indicates Throttle Position Sensor/Switch '1' Circuit Low Input.
Common causes
Common causes include Faulty Throttle Position Sensor: The most common cause is a malfunctioning TPS that fails to send the correct voltage signal to the ECM, Wiring Issues: Damaged, frayed, or corroded wiring in the TPS circuit can lead to poor connectivity and low input signals, Poor Electrical Connections: Loose or corroded connectors can disrupt the signal transmission between the TPS and the ECM.
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 Oct 01, 2024
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Code P0122 2003 Nissan Altima Sedan Description

The P0122 code indicates a low input signal from the Throttle Position Sensor (TPS) or switch '1' circuit in a 2003 Nissan Altima. The TPS is a critical component of the vehicle's electronic throttle control system, which communicates the position of the throttle plate to the Engine Control Module (ECM). This information is essential for the ECM to manage fuel injection, ignition timing, and overall engine performance. When the TPS sends a low voltage signal (below the expected range), the ECM interprets this as a malfunction, triggering the P0122 code.

OBDII Code P0122 2003 Nissan Altima Sedan - Throttle Position Sensor/Switch '1' Circuit Low Input
P0122 2003 Nissan Altima Sedan Code - Throttle Position Sensor/Switch '1' Circuit Low Input

Common Causes of P0122 2003 Nissan Altima Sedan

  1. Faulty Throttle Position Sensor: The most common cause is a malfunctioning TPS that fails to send the correct voltage signal to the ECM.
  2. Wiring Issues: Damaged, frayed, or corroded wiring in the TPS circuit can lead to poor connectivity and low input signals.
  3. Poor Electrical Connections: Loose or corroded connectors can disrupt the signal transmission between the TPS and the ECM.
  4. Throttle Body Problems: Issues with the throttle body, such as carbon buildup or mechanical binding, can affect the TPS's ability to function correctly.
  5. ECM Malfunction: Although rare, a faulty ECM may misinterpret the TPS signal, leading to a P0122 code.

Symptoms of P0122 2003 Nissan Altima Sedan

  1. Poor Acceleration: The vehicle may struggle to gain speed or respond sluggishly to throttle input.
  2. Stalling: The engine may stall unexpectedly, especially during low-speed maneuvers or when coming to a stop.
  3. Check Engine Light: The illumination of the check engine light on the dashboard, indicating a fault in the throttle position circuit.
  4. Erratic Idle: The engine may exhibit an unstable or fluctuating idle speed, making it difficult to maintain a steady RPM.
  5. Reduced Fuel Efficiency: The vehicle may experience increased fuel consumption due to improper air-fuel mixture adjustments.

How to Fix P0122 2003 Nissan Altima Sedan

  1. Visual Inspection: Begin with a thorough visual inspection of the TPS, wiring, and connectors for any signs of damage, corrosion, or loose connections.
  2. Test the Throttle Position Sensor: Use a multimeter to measure the voltage output of the TPS while manually moving the throttle plate. Compare the readings to the manufacturer's specifications.
  3. Repair or Replace Wiring/Connectors: If any wiring issues or poor connections are found, repair or replace them as necessary to ensure proper electrical flow.
  4. Replace the Throttle Position Sensor: If the TPS is determined to be faulty, replace it with a new, OEM-quality sensor to restore proper functionality.
  5. Clear Codes and Test Drive: After repairs, clear the trouble codes using an OBD-II scanner and perform a test drive to ensure the issue is resolved and the check engine light does not reappear.

Cost to Fix P0122 2003 Nissan Altima Sedan

The typical repair costs for addressing a P0122 code can vary widely based on the specific issue identified. For a faulty TPS replacement, parts may range from $50 to $150, while labor costs can vary from $80 to $150 per hour depending on the shop's location and expertise. Overall, a complete repair could cost between $150 and $400, including parts and labor. It's important to note that diagnosis time and labor rates differ based on factors such as the vehicle's make and model, engine type, and geographic location. In metropolitan areas or at dealerships, rates may be higher, while independent shops often offer more competitive pricing. For the most accurate estimate, it's advisable to consult local repair shops.

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 2003 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0122 in a 2003 Nissan Altima Sedan?

The common symptoms of code P0122 include reduced engine power, hesitation or stalling when accelerating, and the vehicle going into "limp mode."

2. What does the OBDII code P0122 indicate in a 2003 Nissan Altima Sedan?

Code P0122 indicates a low input signal from the throttle position sensor or throttle position switch '1' circuit in the 2003 Nissan Altima Sedan.

3. What are the possible causes of OBDII code P0122 in a 2003 Nissan Altima Sedan?

Possible causes of code P0122 include a faulty throttle position sensor, damaged wiring or connectors in the sensor circuit, or a problem with the throttle body itself.

4. How can I diagnose the OBDII code P0122 in my 2003 Nissan Altima Sedan?

To diagnose code P0122, you can use a scan tool to check for the code, inspect the throttle position sensor and its wiring for damage, and perform a voltage test on the sensor.

5. Can I drive my 2003 Nissan Altima Sedan with OBDII code P0122?

It is not recommended to drive your vehicle with OBDII code P0122 as it can lead to further damage and safety issues due to the potential loss of engine power.

6. How can I repair OBDII code P0122 in my 2003 Nissan Altima Sedan?

Repairing code P0122 involves replacing the throttle position sensor if faulty, repairing any damaged wiring or connectors, and resetting the ECU to clear the code.

7. Can a dirty throttle body cause OBDII code P0122 in a 2003 Nissan Altima Sedan?

Yes, a dirty throttle body can cause erratic readings from the throttle position sensor, leading to OBDII code P0122 in a 2003 Nissan Altima Sedan.

8. Will resetting the ECU clear OBDII code P0122 in my 2003 Nissan Altima Sedan?

Resetting the ECU may temporarily clear the code, but if the underlying issue causing code P0122 is not addressed, the code is likely to reappear.

9. Is it necessary to replace the entire throttle body for OBDII code P0122 in a 2003 Nissan Altima Sedan?

In some cases, only the throttle position sensor needs to be replaced, but if the issue persists, the entire throttle body may need to be replaced to resolve code P0122.

10. How can I prevent OBDII code P0122 from recurring in my 2003 Nissan Altima Sedan?

To prevent code P0122 from recurring, regular maintenance of the throttle body, cleaning of the throttle position sensor, and timely repairs of any related issues are recommended.

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