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Engine-Codes – Nissan – P2123 2008 Nissan Altima Sedan

P2123 2008 Nissan Altima Sedan Code - Accelerator Pedal Position Sensor Circuit Range/Performance

Quick Answer

The P2123 diagnostic trouble code for a 2008 Nissan Altima Sedan indicates an issue with the Accelerator Pedal Position Sensor Circuit Range/Performance. Common causes include A faulty accelerator pedal position sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or poor connections in the sensor 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
P2123 2008 Nissan Altima Sedan indicates Accelerator Pedal Position Sensor Circuit Range/Performance.
Common causes
Common causes include A faulty accelerator pedal position sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or poor connections in the sensor 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 17, 2024
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Code P2123 2008 Nissan Altima Sedan Description

The P2123 diagnostic trouble code for a 2008 Nissan Altima Sedan indicates an issue with the Accelerator Pedal Position Sensor Circuit Range/Performance. This sensor is responsible for monitoring the position of the accelerator pedal and sending this information to the engine control module (ECM) to adjust fuel delivery and engine performance accordingly. When the sensor detects that the accelerator pedal position is outside of the expected range or is not performing within the specified parameters, the ECM triggers the P2123 code.

OBDII Code P2123 2008 Nissan Altima Sedan - Accelerator Pedal Position Sensor Circuit Range/Performance
P2123 2008 Nissan Altima Sedan Code - Accelerator Pedal Position Sensor Circuit Range/Performance

Common Causes of P2123 2008 Nissan Altima Sedan

  1. A faulty accelerator pedal position sensor.
  2. Damaged wiring or connectors in the sensor circuit.
  3. Corrosion or poor connections in the sensor circuit.
  4. Malfunctioning ECM.
  5. Environmental factors such as moisture or debris affecting the sensor.

Symptoms of P2123 2008 Nissan Altima Sedan

  1. Reduced acceleration or lack of response when pressing the accelerator pedal.
  2. Rough idling or engine hesitation.
  3. Poor fuel efficiency.
  4. Stalling or difficulty starting the vehicle.
  5. Illumination of the check engine light on the dashboard.

How to Fix P2123 2008 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. Use a multimeter to test the sensor's resistance and voltage output to determine if it is functioning correctly.
  3. If the sensor is faulty, replace it with a new OEM (original equipment manufacturer) sensor.
  4. Clear the diagnostic trouble codes from the ECM using a scan tool and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnosis may be required to identify any underlying issues with the wiring or ECM.

Cost to Fix P2123 2008 Nissan Altima Sedan

The typical repair costs for addressing a P2123 code on a 2008 Nissan Altima Sedan can vary depending on the specific cause of the issue. In general, the cost of replacing the accelerator pedal position sensor can range from $100 to $200, including parts and labor. Additional costs may apply if wiring repairs or ECM replacement are necessary. It is advisable to consult with a trusted mechanic or dealership to obtain a more accurate estimate based on the specific circumstances of the vehicle. Keep in mind that labor rates and diagnostic fees can vary based on location and service provider.

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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 2008 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P2123 on a 2008 Nissan Altima Sedan?

- Common symptoms include reduced engine power, hesitation or stalling when accelerating, and the vehicle going into limp mode.

2. What does the OBDII code P2123 on a 2008 Nissan Altima Sedan indicate?

- The code P2123 specifically refers to an issue with the Accelerator Pedal Position Sensor Circuit Range/Performance.

3. What are the possible causes of OBDII code P2123 on a 2008 Nissan Altima Sedan?

- The code P2123 can be caused by a faulty accelerator pedal position sensor, damaged wiring or connectors in the sensor circuit, or issues with the engine control module.

4. How can I diagnose the OBDII code P2123 on my 2008 Nissan Altima Sedan?

- Diagnosing the code P2123 typically involves using a scan tool to check for the specific trouble code, testing the accelerator pedal position sensor, and inspecting the sensor circuit for any faults.

5. Can I still drive my 2008 Nissan Altima Sedan with the OBDII code P2123 present?

- It is not recommended to drive the vehicle with the code P2123 present, as it can lead to potential safety hazards and further damage to the vehicle.

6. How can I repair OBDII code P2123 on my 2008 Nissan Altima Sedan?

- Repairing the code P2123 may involve replacing the accelerator pedal position sensor, repairing any damaged wiring or connectors, or reprogramming the engine control module.

7. Are there any DIY tips for fixing OBDII code P2123 on a 2008 Nissan Altima Sedan?

- DIY tips for fixing the code P2123 include checking and cleaning the sensor connectors, inspecting the wiring for any visible damage, and ensuring all connections are secure.

8. Will resetting the OBDII code P2123 on my 2008 Nissan Altima Sedan make it go away permanently?

- Resetting the code may temporarily clear the error, but if the underlying issue causing the code is not fixed, it is likely to reappear.

9. How much does it typically cost to repair OBDII code P2123 on a 2008 Nissan Altima Sedan?

- The cost of repairing the code P2123 can vary depending on the extent of the issue and whether you choose to do the repairs yourself or take the vehicle to a professional mechanic.

10. Is OBDII code P2123 a common issue in 2008 Nissan Altima Sedans?

- While it may not be extremely common, issues with the accelerator pedal position sensor circuit can occur in 2008 Nissan Altima Sedans, leading to the code P2123 being triggered.

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