AutoCodes – Honda – P0123 1998 Honda Civic

P0123 1998 Honda Civic Code - Throttle Position Sensor/Switch 'A' Circuit High Voltage

Quick Answer

The Throttle Position Sensor (TPS) responds to the accelerator pedal movement. Common causes include Faulty throttle position sensor, Throttle position sensor harness is open or shorted, Throttle position sensor 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 1998 Honda Civic indicates Throttle Position Sensor/Switch 'A' Circuit High Voltage.
Common causes: Common causes include Faulty throttle position sensor, Throttle position sensor harness is open or shorted, Throttle position sensor 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 5,964

How popular is this code, among other codes? Low

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 Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0123 1998 Honda Civic Description

The Throttle Position Sensor (TPS) responds to the accelerator pedal movement. This sensor is a kind of potentiometer which transforms the throttle position into output voltage, and emits the voltage signal to the Engine Control Module (ECM). In addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal to the ECM.
Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sensor. This sensor controls engine operation such as fuel cut. On the other hand, the Wide open and closed throttle position switch, which is built into the throttle position sensor unit, is not used for engine control.

OBDII Code P0123 1998 Honda Civic - Throttle Position Sensor/Switch 'A' Circuit High Voltage - AutoCodes.com — P0123 1998 Honda Civic Code - Throttle Position Sensor/Switch 'A' Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0123 1998 Honda Civic?

Faulty throttle position sensor
Throttle position sensor harness is open or shorted
Throttle position sensor circuit poor electrical connection

How to Fix the DTC P0123 1998 Honda Civic?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0123 1998 Honda Civic 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.

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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 P0123 1998 Honda Civic Code

1. What are the common symptoms of OBDII code P0123 on a 1998 Honda Civic?

- Common symptoms include issues with acceleration, engine stalling, rough idling, and poor fuel efficiency.

2. What does the OBDII code P0123 indicate on a 1998 Honda Civic?

- The code indicates a high voltage condition in the throttle position sensor or switch 'A' circuit.

3. What are the possible causes of OBDII code P0123 on a 1998 Honda Civic?

- Possible causes include a faulty throttle position sensor, damaged wiring or connectors in the circuit, or a problem with the engine control module.

4. How can I diagnose the throttle position sensor/sensor 'A' circuit high voltage issue on my 1998 Honda Civic?

- You can use a multimeter to test the throttle position sensor's voltage output, check the wiring for any damage, and inspect the connectors for proper connection.

5. Can I continue to drive my 1998 Honda Civic with OBDII code P0123?

- It is not recommended to drive the vehicle with this code as it can lead to performance issues and potential damage to other engine components.

6. How can I repair OBDII code P0123 on my 1998 Honda Civic?

- Repair options include replacing the throttle position sensor, repairing damaged wiring or connectors, or resetting the engine control module after fixing the issue.

7. Is it possible to reset OBDII code P0123 on a 1998 Honda Civic without fixing the underlying issue?

- While clearing the code may temporarily turn off the check engine light, the issue will likely reappear until the root cause is addressed.

8. Can a DIY enthusiast fix OBDII code P0123 on a 1998 Honda Civic?

- Depending on your skill level and access to tools, you may be able to replace the throttle position sensor or check the wiring yourself. However, professional diagnosis and repair might be more reliable.

9. How much does it cost to repair OBDII code P0123 on a 1998 Honda Civic at a mechanic?

- Repair costs can vary depending on the exact cause of the issue, but expect to pay for parts and labor, which could range from $100 to $300 or more.

10. Will fixing OBDII code P0123 improve the overall performance of my 1998 Honda Civic?

- Yes, addressing the high voltage issue in the throttle position sensor circuit should help restore normal engine performance, leading to smoother acceleration and better fuel efficiency.