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P2123 Infiniti Code - Accelerator Pedal Position Sensor Circuit Range/Performance

Quick Answer

The P2123 diagnostic trouble code for Infiniti vehicles indicates an issue with the Accelerator Pedal Position Sensor Circuit Range/Performance. Common causes include Defective accelerator pedal position sensor, Damaged or corroded wiring/connectors in the sensor circuit, Faulty ECM (Engine Control Module). 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 Infiniti indicates Accelerator Pedal Position Sensor Circuit Range/Performance.
Common causes
Common causes include Defective accelerator pedal position sensor, Damaged or corroded wiring/connectors in the sensor circuit, Faulty ECM (Engine Control Module).
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 07, 2024
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Code P2123 Infiniti Description

The P2123 diagnostic trouble code for Infiniti vehicles indicates an issue with the Accelerator Pedal Position Sensor Circuit Range/Performance. The accelerator pedal position sensor is a vital component that communicates with the vehicle's Engine Control Module (ECM) to determine how much fuel and air should be delivered to the engine based on the driver's input. When this sensor malfunctions or fails to provide accurate data, it can lead to a variety of performance issues and potential safety concerns.

OBDII Code P2123 Infiniti - Accelerator Pedal Position Sensor Circuit Range/Performance
P2123 Infiniti Code - Accelerator Pedal Position Sensor Circuit Range/Performance

Common Causes of P2123 Infiniti

  1. Defective accelerator pedal position sensor.
  2. Damaged or corroded wiring/connectors in the sensor circuit.
  3. Faulty ECM (Engine Control Module).
  4. Electrical interference or short circuits in the sensor circuit.
  5. Accumulated dirt or debris affecting sensor operation.

Symptoms of P2123 Infiniti

  1. Engine hesitation or lack of response when pressing the accelerator pedal.
  2. Rough idle or stalling when coming to a stop.
  3. Reduced fuel efficiency and increased fuel consumption.
  4. Check Engine Light illuminated on the dashboard.
  5. Vehicle going into limp mode, limiting power output.

How to Fix P2123 Infiniti

  1. Begin by conducting a thorough inspection of the accelerator pedal position sensor, wiring, and connectors for any visible damage.
  2. Use a multimeter to test the sensor's output voltage and resistance to determine if it is within the manufacturer's specifications.
  3. Check for any loose connections or corrosion in the sensor circuit and repair or replace as necessary.
  4. If the sensor itself is faulty, replace it with a new OEM or high-quality aftermarket unit.
  5. Clear the trouble code using a scan tool and perform a test drive to ensure the issue has been resolved.

Cost to Fix P2123 Infiniti

The typical repair costs for addressing a P2123 code on an Infiniti vehicle 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 significantly, so it's advisable to check with local shops for a more accurate estimate. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.

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Information for Specific Infiniti Models

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 Infiniti Code

1. What does the OBDII code P2123 mean for an Infiniti?

P2123 indicates an issue with the Accelerator Pedal Position (APP) Sensor circuit, specifically that it is out of range or has a performance problem.

2. What are common symptoms of the P2123 code in an Infiniti?

Symptoms may include reduced engine performance, the vehicle entering "limp mode," an illuminated check engine light, and unresponsive or erratic throttle behavior.

3. What causes the P2123 code to appear on an Infiniti?

Common causes include a faulty accelerator pedal position sensor, damaged wiring or connectors in the sensor circuit, or issues with the engine control module (ECM).

4. Can I drive my Infiniti with the P2123 code?

Driving with this code is not recommended, as it can limit throttle response and potentially lead to unsafe driving conditions.

5. How do I diagnose the P2123 code on an Infiniti?

Start by inspecting the accelerator pedal position sensor, checking for damaged wiring, loose connections, or corrosion. Use a multimeter to test the sensor's voltage and continuity if necessary.

6. How is the P2123 code fixed on an Infiniti?

Repairs may include replacing the accelerator pedal position sensor, repairing or replacing damaged wiring, or reprogramming the ECM if needed.

7. How much does it cost to fix the P2123 code on an Infiniti?

The repair cost can range from $150 to $400, depending on whether the sensor needs replacement or if additional wiring repairs are required.

8. Does the P2123 code require reprogramming the ECM?

In some cases, reprogramming the ECM may be necessary if the issue is related to a software glitch or if a new sensor requires calibration.

9. Can a dirty throttle body trigger the P2123 code on an Infiniti?

While uncommon, a dirty throttle body can indirectly contribute to throttle-related issues, but the code specifically points to the APP sensor circuit.

10. Is the P2123 code unique to Infiniti vehicles?

No, P2123 is a generic OBDII code that applies to many vehicles, but troubleshooting steps and repair procedures may vary depending on the make and model.

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