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Engine-Codes – Isuzu – P0123 Isuzu

P0123 Isuzu Code - Throttle Position Sensor 1 High Voltage

Quick Answer

When the OBD-II code P0123 appears on an Isuzu vehicle, it indicates an issue with the Throttle Position Sensor (TPS) 1 registering a higher voltage than expected by the Engine Control Module (ECM). Common causes include Faulty Throttle Position Sensor (TPS), Wiring issues (short circuit, open circuit, poor connection), Malfunctioning Engine Control Module (ECM). 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 Isuzu indicates Throttle Position Sensor 1 High Voltage.
Common causes
Common causes include Faulty Throttle Position Sensor (TPS), Wiring issues (short circuit, open circuit, poor connection), Malfunctioning Engine Control Module (ECM).
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 08, 2024
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Code P0123 Isuzu Description

When the OBD-II code P0123 appears on an Isuzu vehicle, it indicates an issue with the Throttle Position Sensor (TPS) 1 registering a higher voltage than expected by the Engine Control Module (ECM). The TPS is a vital component that monitors the position of the throttle pedal and sends this information to the ECM, which then adjusts the fuel delivery and ignition timing accordingly. If the TPS 1 is reporting high voltage consistently, it can lead to various performance issues in the vehicle.

OBDII Code P0123 Isuzu - Throttle Position Sensor 1 High Voltage
P0123 Isuzu Code - Throttle Position Sensor 1 High Voltage

Common Causes of P0123 Isuzu

  1. Faulty Throttle Position Sensor (TPS)
  2. Wiring issues (short circuit, open circuit, poor connection)
  3. Malfunctioning Engine Control Module (ECM)
  4. Corrosion or damage to TPS connectors
  5. Mechanical issues affecting the throttle body

Symptoms of P0123 Isuzu

  1. Erratic throttle response
  2. Hesitation during acceleration
  3. Poor fuel efficiency
  4. Stalling
  5. Check Engine Light illuminated

How to Fix P0123 Isuzu

  1. Begin by connecting a diagnostic scanner to the vehicle to verify the P0123 code and ensure it is related to the TPS 1 high voltage issue.
  2. Inspect the TPS and its wiring for any visible damage, corrosion, or loose connections. Replace or repair any damaged components.
  3. Test the TPS using a multimeter to check its voltage output at various throttle positions. Replace the TPS if it is not within the manufacturer's specifications.
  4. Clear the trouble codes from the ECM with the diagnostic scanner and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnosis may be needed to identify any underlying issues with the ECM or throttle body.

Cost to Fix P0123 Isuzu

The typical repair costs for addressing the P0123 code on an Isuzu vehicle can vary depending on the specific parts and labor required. In general, the cost of replacing a faulty Throttle Position Sensor can range from $50 to $200, depending on the make and model of the vehicle. Additionally, labor costs for this repair can vary between $100 to $300, depending on the shop's hourly rates and the complexity of the job.

When is the Code Detected?

An excessively high voltage from the Throttle Position Sensor (TPS) is sent to Engine Control Module (ECM).

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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 Isuzu Code

1. What are the common symptoms of OBDII code P0123 on an Isuzu related to the throttle position sensor?

- Common symptoms include difficulty accelerating, poor fuel efficiency, stalling, and an illuminated check engine light.

2. What does OBDII code P0123 indicate in an Isuzu?

- OBDII code P0123 indicates that the throttle position sensor 1 is reporting a higher voltage than expected by the engine control module.

3. What are some possible causes of OBDII code P0123 in an Isuzu?

- Possible causes include a faulty throttle position sensor, wiring issues, a dirty throttle body, or a problem with the engine control module.

4. How can I diagnose the throttle position sensor 1 high voltage issue on my Isuzu?

- Diagnose by checking the sensor's wiring, inspecting the throttle body for cleanliness, testing the sensor's voltage output, and scanning for other potential related codes.

5. Can I drive my Isuzu with OBDII code P0123?

- It is not recommended to drive your Isuzu with code P0123 as it can lead to performance issues and potential safety hazards.

6. How can I repair OBDII code P0123 on my Isuzu?

- Repair options include replacing the throttle position sensor, repairing any damaged wiring, cleaning the throttle body, or reprogramming the engine control module.

7. Is it necessary to reset the OBDII code P0123 after repair on an Isuzu?

- Yes, it is important to reset the code using an OBDII scanner after repairing the issue to clear the check engine light and monitor for any recurring problems.

8. Can a DIY enthusiast fix OBDII code P0123 on an Isuzu?

- Depending on the skill level and tools available, a DIY enthusiast may be able to fix code P0123 by following repair guides and using proper diagnostic equipment.

9. How much does it typically cost to repair OBDII code P0123 on an Isuzu?

- The cost of repairing code P0123 can vary depending on the cause of the issue, but it may range from $100 to $300 for parts and labor.

10. Are there any preventative maintenance tips to avoid OBDII code P0123 in an Isuzu?

- Regularly cleaning the throttle body, checking the throttle position sensor for proper operation, and addressing any engine performance issues promptly can help prevent code P0123 in an Isuzu.

Discuss the causes and fixes for P0123 Isuzu OBDII Code

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  • i have replaced the tps sensor had the old one tested it was bad. put the new one on ran good for a min. then started to die and cut off starts right back up and does the same thing engine code will not erase

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