AutoCodes – Honda – P0123 Honda

P0123 Honda Code - Throttle Position Sensor 'A' Circuit High Voltage

Quick Answer

The electronic throttle control system controls the throttle valve opening. Common causes include Faulty Throttle Body, Throttle Body harness is open or shorted, Throttle Body circuit poor electrical connection. 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: P0123 Honda indicates Throttle Position Sensor 'A' Circuit High Voltage.
Common causes: Common causes include Faulty Throttle Body, Throttle Body harness is open or shorted, Throttle Body circuit poor electrical connection.
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.

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Code Popularity 43,360

How popular is this code, among other codes? Medium

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 02, 2023

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0123 Honda Description

The electronic throttle control system controls the throttle valve opening. The system includes the throttle actuator, the throttle valve, Throttle Position (TP) sensors 'A' and 'B', the Electronic Throttle Control System (ETCS) control relay, the Accelerator Pedal Position (APP) sensor, and the Powertrain Control Module (PCM). TP Sensor 'A' is a semiconductor type, and it is attached to the throttle body and shaft to determine the throttle valve position. The throttle valve position signal from TP Sensor 'A' is transmitted to the PCM for target position feedback control. If the signal from TP Sensor 'A' is a fixed value for a set time, the PCM detects a TP Sensor 'A' malfunction and stores a Diagnostic Trouble Code (DTC).

OBDII Code P0123 Honda - Throttle Position Sensor 'A' Circuit High Voltage - AutoCodes.com — P0123 Honda Code - Throttle Position Sensor 'A' Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0123 Honda?

Faulty Throttle Body
Throttle Body harness is open or shorted
Throttle Body circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P0123 Honda?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0123 Honda code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0123 Honda code?

Need more information on how to fix the P0123 Honda code? Get Access to Factory Service Manuals

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Get the P0123 Honda code diagnosed by a professional: Find a repair shop in your area

Information for Specific Honda Models

P0123 1996 Honda Civic — Throttle Position Sensor/Switch 'A' Circuit High Voltage
P0123 1997 Honda Civic — Throttle Position Sensor/Switch 'A' Circuit High Voltage
P0123 1998 Honda Civic — Throttle Position Sensor/Switch 'A' Circuit High Voltage
P0123 1999 Honda Civic — Throttle Position Sensor/Switch 'A' Circuit High Voltage
P0123 2000 Honda Civic — Throttle Position Sensor/Switch 'A' Circuit High Voltage
P0123 2016 Honda CR-V — Throttle Position Sensor 'A' Circuit High Voltage
P0123 2017 Honda CR-V — Throttle Position Sensor 'A' Circuit High Voltage
P0123 2018 Honda CR-V — Throttle Position Sensor 'A' Circuit High Voltage
P0123 2019 Honda CR-V — Throttle Position Sensor 'A' Circuit High Voltage
P0123 2020 Honda CR-V — Throttle Position Sensor 'A' Circuit High Voltage
P0123 2021 Honda CR-V — Throttle Position Sensor 'A' Circuit High Voltage

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 P0123 Honda Code

1. What are the common symptoms of OBDII code P0123 in a Honda related to the throttle position sensor?

- Common symptoms include poor acceleration, stalling, rough idling, and potential issues with the transmission shifting.

2. What are the potential causes of OBDII code P0123 in a Honda?

- The code P0123 is typically triggered by a faulty throttle position sensor, damaged wiring or connectors, or issues with the engine control module (ECM).

3. How can I diagnose the throttle position sensor 'A' circuit high voltage issue in my Honda?

- Diagnosing this issue involves using a scan tool to read the OBDII code, checking the sensor's voltage output, inspecting wiring for damage, and testing the sensor's functionality.

4. Can I drive my Honda with the throttle position sensor 'A' circuit high voltage issue?

- It is not recommended to drive your Honda with this issue as it can lead to poor performance, potential safety hazards, and further damage to the vehicle.

5. What are some repair tips for fixing the throttle position sensor 'A' circuit high voltage problem in a Honda?

- Repair tips include replacing the faulty throttle position sensor, repairing damaged wiring or connectors, and resetting the ECM after the issue has been resolved.

6. Will resetting the ECM clear the OBDII code P0123 in my Honda?

- Resetting the ECM may temporarily clear the code, but it is important to diagnose and fix the underlying issue causing the P0123 code to prevent it from reoccurring.

7. How much does it typically cost to repair the throttle position sensor 'A' circuit high voltage problem in a Honda?

- The cost of repairs can vary depending on the extent of the issue, but it may range from $100 to $300 for parts and labor.

8. Can a DIY enthusiast replace the throttle position sensor in a Honda to fix the P0123 code?

- Yes, replacing the throttle position sensor can be a DIY project for those with automotive repair experience and the necessary tools. However, proper diagnosis is crucial to ensure the sensor is the root cause of the issue.

9. Are there any preventive maintenance tips to avoid the throttle position sensor 'A' circuit high voltage issue in a Honda?

- Regularly inspecting the sensor and its connections for wear or damage, keeping up with recommended maintenance schedules, and avoiding harsh driving conditions can help prevent this issue.

10. How long does it take to repair the throttle position sensor 'A' circuit high voltage issue in a Honda?

- The repair time can vary depending on the extent of the issue and the availability of parts, but it typically takes a few hours to a full day to diagnose and fix the problem.