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

Quick Answer

The P2123 Honda code indicates a problem with the Accelerator Pedal Position Sensor 'A' Throttle Position Sensor 'D' Circuit High Voltage. Common causes include Wiring issues such as corrosion, damage, or loose connections, Faulty accelerator pedal position sensor or throttle position sensor, ECM malfunction. 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 Honda indicates Accelerator Pedal Position Sensor 'A' Throttle Position Sensor 'D' Circuit High Voltage.
Common causes
Common causes include Wiring issues such as corrosion, damage, or loose connections, Faulty accelerator pedal position sensor or throttle position sensor, ECM malfunction.
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 09, 2024
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Code P2123 Honda Description

The P2123 Honda code indicates a problem with the Accelerator Pedal Position Sensor 'A' Throttle Position Sensor 'D' Circuit High Voltage. This means that the voltage signal being sent by the accelerator pedal position sensor to the Engine Control Module (ECM) is higher than the expected range. The accelerator pedal position sensor is responsible for detecting how much pressure the driver is applying to the accelerator pedal, while the throttle position sensor monitors the position of the throttle valve. When these sensors detect a high voltage, it can lead to issues with the vehicle's performance, fuel efficiency, and overall drivability.

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

Common Causes of P2123 Honda

  1. Wiring issues such as corrosion, damage, or loose connections
  2. Faulty accelerator pedal position sensor or throttle position sensor
  3. ECM malfunction
  4. Water or debris intrusion into sensor circuits
  5. Poor electrical ground connections

Symptoms of P2123 Honda

  1. Check Engine Light illuminated
  2. Rough idling or stalling
  3. Poor acceleration or hesitation
  4. Reduced fuel efficiency
  5. Engine misfires

How to Fix P2123 Honda

  1. Diagnose the issue by using a scan tool to check for the P2123 code and perform a thorough inspection of the accelerator pedal position sensor and throttle position sensor circuits.
  2. Inspect the wiring harness for any signs of damage, corrosion, or loose connections. Repair or replace any faulty wiring.
  3. Test the accelerator pedal position sensor and throttle position sensor using a multimeter to ensure they are functioning correctly. Replace any sensors that are faulty.
  4. Clear the code from the ECM and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, further diagnostics may be needed to identify any underlying ECM issues or other potential causes.

Cost to Fix P2123 Honda

The typical repair cost for addressing the P2123 Honda code can range between $200 and $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. It is recommended to check with local auto repair shops for a more accurate estimate based on your specific circumstances. Labor rates commonly fall between $80 and $150 per hour, but rates may be higher in metropolitan areas or at dealerships, while independent shops may offer lower rates.

What does this mean?

Tech Notes for P2123 Honda

ECM may need to updated

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Information for Specific Honda 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.

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