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Engine-Codes – Honda – P2123 2009 Honda Accord

P2123 2009 Honda Accord Code - Accelerator Pedal Position Sensor 'A' Throttle Position Sensor 'D' Circuit High Voltage

Quick Answer

The P2123 diagnostic trouble code for a 2009 Honda Accord indicates an issue with the Accelerator Pedal Position Sensor 'A' Throttle Position Sensor 'D' Circuit registering high voltage. Common causes include Faulty accelerator pedal position sensor, Faulty throttle position sensor, Wiring or connector issues 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 2009 Honda Accord indicates Accelerator Pedal Position Sensor 'A' Throttle Position Sensor 'D' Circuit High Voltage.
Common causes
Common causes include Faulty accelerator pedal position sensor, Faulty throttle position sensor, Wiring or connector issues 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 2009 Honda Accord Description

The P2123 diagnostic trouble code for a 2009 Honda Accord indicates an issue with the Accelerator Pedal Position Sensor 'A' Throttle Position Sensor 'D' Circuit registering high voltage. This code is typically triggered when the Engine Control Module (ECM) detects a voltage signal from the accelerator pedal position sensor or throttle position sensor that is higher than the expected range. These sensors are crucial components of the vehicle's electronic throttle control system, responsible for communicating the driver's input to the ECM to adjust the throttle opening accordingly.

OBDII Code P2123 2009 Honda Accord - Accelerator Pedal Position Sensor 'A' Throttle Position Sensor 'D' Circuit High Voltage
P2123 2009 Honda Accord Code - Accelerator Pedal Position Sensor 'A' Throttle Position Sensor 'D' Circuit High Voltage

Common Causes of P2123 2009 Honda Accord

  1. Faulty accelerator pedal position sensor
  2. Faulty throttle position sensor
  3. Wiring or connector issues in the sensor circuit
  4. Corrosion or damage to sensor components
  5. ECM malfunction or software issues

Symptoms of P2123 2009 Honda Accord

  1. Check Engine Light illuminated on the dashboard
  2. Hesitation or lack of response when pressing the accelerator pedal
  3. Engine stalling or rough idling
  4. Reduced engine power or acceleration
  5. Poor fuel efficiency

How to Fix P2123 2009 Honda Accord

  1. Begin by conducting a thorough inspection of the accelerator pedal position sensor and throttle position sensor to check for any visible damage or corrosion.
  2. Test the sensors using a multimeter to measure voltage output and ensure they are within the specified range.
  3. Inspect the wiring harness and connectors for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  4. Clear the diagnostic trouble codes from the ECM using a scan tool and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, consider replacing the faulty sensor(s) or consulting a professional technician for further diagnosis.

Cost to Fix P2123 2009 Honda Accord

The typical repair costs for addressing a P2123 code on a 2009 Honda Accord can vary depending on the specific cause of the issue. Replacement sensors or wiring repairs may cost between $100 to $300, while labor charges can range from $100 to $200. Overall, the total repair cost may fall within the range of $200 to $500. It's important to note that diagnosis time and labor rates can vary, so it's advisable to check with local auto repair shops for more accurate estimates.

What does this mean?

Tech Notes for P2123 2009 Honda Accord

ECM may need to updated

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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 Honda Accord Code

1. What are the common symptoms of OBDII code P2123 in a 2009 Honda Accord?

- Common symptoms include issues with acceleration, reduced engine power, and the vehicle going into limp mode.

2. What does the OBDII code P2123 mean for a 2009 Honda Accord?

- The code indicates a high voltage condition in the accelerator pedal position sensor 'A' throttle position sensor 'D' circuit.

3. What are the possible causes of OBDII code P2123 in a 2009 Honda Accord?

- Possible causes include a faulty accelerator pedal position sensor, issues with the throttle position sensor, wiring problems, or a malfunctioning ECM.

4. How can I diagnose OBDII code P2123 in my 2009 Honda Accord?

- Diagnosis involves using a scan tool to retrieve the trouble code, checking the wiring and connectors for damage, and testing the sensors for proper functionality.

5. Can I drive my 2009 Honda Accord with OBDII code P2123?

- It is not recommended to drive the vehicle with this code as it can lead to performance issues and potential safety hazards.

6. How can I repair OBDII code P2123 in my 2009 Honda Accord?

- Repair typically involves replacing the faulty accelerator pedal position sensor or throttle position sensor, repairing any wiring issues, and clearing the trouble code.

7. Is it safe to reset the OBDII code P2123 in my 2009 Honda Accord myself?

- It is safe to reset the code after making necessary repairs, but it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. Can a DIY enthusiast fix OBDII code P2123 in a 2009 Honda Accord?

- It is possible for a DIY enthusiast to fix the issue if they have the necessary tools, knowledge, and experience working on automotive electronics.

9. Will OBDII code P2123 cause permanent damage to my 2009 Honda Accord?

- If left unresolved, the high voltage condition indicated by the code can potentially cause damage to other components in the vehicle over time.

10. How can I prevent OBDII code P2123 from appearing in my 2009 Honda Accord in the future?

- Regular maintenance, checking and cleaning electrical connections, and addressing any warning signs promptly can help prevent the recurrence of this code.

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