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P2123 2009 Nissan Altima Sedan Code - Accelerator Pedal Position Sensor Circuit Range/Performance

Quick Answer

The P2123 diagnostic trouble code for a 2009 Nissan Altima Sedan relates to the Accelerator Pedal Position Sensor Circuit Range/Performance. Common causes include Faulty accelerator pedal position sensor, Damaged wiring or connectors in the sensor circuit, Malfunctioning 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
P2123 2009 Nissan Altima Sedan indicates Accelerator Pedal Position Sensor Circuit Range/Performance.
Common causes
Common causes include Faulty accelerator pedal position sensor, Damaged wiring or connectors in the sensor circuit, Malfunctioning 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 Sep 17, 2024
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Code P2123 2009 Nissan Altima Sedan Description

The P2123 diagnostic trouble code for a 2009 Nissan Altima Sedan relates to the Accelerator Pedal Position Sensor Circuit Range/Performance. This code indicates that there is a problem with the accelerator pedal position sensor, which is responsible for sending signals to the engine control module (ECM) regarding the position of the accelerator pedal. The ECM uses this information to determine the appropriate fuel delivery and ignition timing for optimal engine performance.

OBDII Code P2123 2009 Nissan Altima Sedan - Accelerator Pedal Position Sensor Circuit Range/Performance
P2123 2009 Nissan Altima Sedan Code - Accelerator Pedal Position Sensor Circuit Range/Performance

Common Causes of P2123 2009 Nissan Altima Sedan

  1. Faulty accelerator pedal position sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Malfunctioning ECM
  4. Corrosion or contamination in the sensor circuit
  5. Electrical issues such as short circuits or open circuits

Symptoms of P2123 2009 Nissan Altima Sedan

  1. Poor acceleration
  2. Hesitation when pressing the accelerator pedal
  3. Rough idling
  4. Stalling
  5. Reduced fuel efficiency

How to Fix P2123 2009 Nissan Altima Sedan

  1. Begin by conducting a thorough inspection of the accelerator pedal position sensor and its wiring harness to check for any visible damage or corrosion.
  2. Test the sensor using a multimeter to determine if it is functioning within the specified range.
  3. If the sensor is faulty, replace it with a new one following the manufacturer's guidelines.
  4. Check the wiring and connectors for any signs of damage and repair or replace them as needed.
  5. Clear the diagnostic trouble codes from the ECM using a scan tool and perform a test drive to ensure that the issue has been resolved.

Cost to Fix P2123 2009 Nissan Altima Sedan

The typical repair costs for addressing the P2123 code on a 2009 Nissan Altima Sedan can range from $150 to $400, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Additionally, rates may be higher at dealerships or in metropolitan areas, while independent shops often offer more competitive pricing.

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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 P2123 2009 Nissan Altima Sedan Code

1. What does the OBDII code P2123 for a 2009 Nissan Altima Sedan mean?

The code P2123 indicates an issue with the Accelerator Pedal Position Sensor Circuit Range/Performance in the vehicle.

2. What are common symptoms of the P2123 code in a 2009 Nissan Altima Sedan?

Common symptoms of the P2123 code may include reduced engine power, hesitation or stalling when accelerating, and the vehicle going into "limp mode."

3. What are the possible causes of the P2123 code in a 2009 Nissan Altima Sedan?

Possible causes of the P2123 code include a faulty accelerator pedal position sensor, damaged wiring or connectors in the sensor circuit, or issues with the electronic control module (ECM).

4. How can I diagnose the P2123 code in my 2009 Nissan Altima Sedan?

Diagnosing the P2123 code typically involves using an OBDII scanner to retrieve the code, checking the condition of the accelerator pedal position sensor, inspecting the sensor circuit for any damage, and testing the ECM for proper functionality.

5. Can I still drive my 2009 Nissan Altima Sedan with the P2123 code present?

It is not recommended to drive the vehicle with the P2123 code present, as it can lead to unsafe driving conditions and potential further damage to the engine or other components.

6. How can I repair the P2123 code in my 2009 Nissan Altima Sedan?

Repairing the P2123 code may involve replacing the accelerator pedal position sensor, repairing any damaged wiring or connectors in the circuit, or reprogramming the ECM if necessary.

7. Is it possible for the P2123 code to be triggered by a loose gas cap on a 2009 Nissan Altima Sedan?

No, the P2123 code specifically relates to issues with the accelerator pedal position sensor circuit and is not related to a loose gas cap.

8. Can a DIY enthusiast fix the P2123 code in a 2009 Nissan Altima Sedan?

While some DIY enthusiasts may be able to diagnose and repair the P2123 code, it is recommended to seek professional help, especially when dealing with electronic components and sensor circuits.

9. How much does it cost to repair the P2123 code in a 2009 Nissan Altima Sedan?

The cost of repairing the P2123 code can vary depending on the specific issue causing the code, the labor rates in your area, and whether you choose to repair it yourself or take it to a mechanic.

10. Will resetting the OBDII code clear the P2123 code in a 2009 Nissan Altima Sedan?

Resetting the OBDII code may temporarily clear the code, but if the underlying issue causing the P2123 code is not addressed, the code is likely to reappear.

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