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Engine-Codes – Isuzu – P0120 Isuzu

P0120 Isuzu Code - Throttle Position Sensor 1 Circuit

Quick Answer

The P0120 code for Isuzu vehicles indicates an issue with the Throttle Position Sensor 1 Circuit. Common causes include Faulty throttle position sensor, Wiring or connector issues in the TPS circuit, Corrosion or damage to TPS components. 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
P0120 Isuzu indicates Throttle Position Sensor 1 Circuit.
Common causes
Common causes include Faulty throttle position sensor, Wiring or connector issues in the TPS circuit, Corrosion or damage to TPS components.
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 12, 2024
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Code P0120 Isuzu Description

The P0120 code for Isuzu vehicles indicates an issue with the Throttle Position Sensor 1 Circuit. The throttle position sensor (TPS) is a crucial component of the engine management system, as it monitors the position of the throttle valve and sends signals to the engine control unit (ECU) to adjust fuel delivery and ignition timing accordingly. When the TPS 1 circuit malfunctions, it can lead to a variety of performance issues and potentially cause long-term damage if left unresolved.

OBDII Code P0120 Isuzu - Throttle Position Sensor 1 Circuit
P0120 Isuzu Code - Throttle Position Sensor 1 Circuit

Common Causes of P0120 Isuzu

  1. Faulty throttle position sensor
  2. Wiring or connector issues in the TPS circuit
  3. Corrosion or damage to TPS components
  4. ECU malfunction affecting TPS signal
  5. Environmental factors such as moisture or debris affecting TPS operation

Symptoms of P0120 Isuzu

  1. Check Engine Light illuminated on the dashboard
  2. Erratic or surging engine performance
  3. Difficulty starting the vehicle
  4. Poor acceleration or throttle response
  5. Stalling or rough idling

How to Fix P0120 Isuzu

  1. Begin by diagnosing the issue using a scan tool to confirm the P0120 code and identify the specific TPS 1 circuit problem.
  2. Inspect the throttle position sensor for any visible damage, corrosion, or loose connections. Replace the TPS if necessary.
  3. Check the wiring and connectors in the TPS circuit for any signs of wear, fraying, or disconnection. Repair or replace damaged components.
  4. Clear the diagnostic trouble codes from the ECU using the scan tool and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be required to pinpoint the exact cause of the TPS 1 circuit malfunction.

Cost to Fix P0120 Isuzu

The typical repair costs for addressing a P0120 code related to the Throttle Position Sensor 1 Circuit can range from $100 to $300, depending on the specific components that need to be replaced and the labor involved. This estimate includes the cost of a new throttle position sensor, any necessary wiring repairs, and the labor charges for diagnosis and repair. It's important to note that actual repair costs can vary based on the vehicle's make and model, the location of the repair shop, and the extent of the damage. Additionally, diagnostic time and labor rates at auto repair shops can vary, so it's advisable to obtain quotes from multiple sources for a more accurate estimate.

When is the Code Detected?

Malfunction is detected when an excessively low or high voltage from the sensor 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 P0120 Isuzu Code

1. What are the common symptoms of OBDII code P0120 in an Isuzu related to the Throttle Position Sensor 1 Circuit?

The common symptoms of code P0120 in an Isuzu include issues with acceleration, poor fuel economy, stalling, and potentially even difficulty starting the vehicle.

2. What are some possible causes of OBDII code P0120 in an Isuzu?

Common causes of code P0120 in an Isuzu include a faulty throttle position sensor, damaged wiring or connectors in the sensor circuit, or a problem with the engine control module.

3. How can I diagnose the Throttle Position Sensor 1 Circuit issue causing OBDII code P0120 in my Isuzu?

You can diagnose the issue by using a scan tool to read the code, visually inspecting the sensor and its wiring for damage, testing the sensor's resistance, and checking for proper voltage signals.

4. Can I drive my Isuzu with OBDII code P0120 related to the Throttle Position Sensor 1 Circuit?

It is not recommended to drive your Isuzu with an active P0120 code, as it can lead to poor performance and potential safety hazards. It's best to address the issue promptly.

5. How can I repair OBDII code P0120 in my Isuzu due to a faulty Throttle Position Sensor 1 Circuit?

To repair the issue, you may need to replace the throttle position sensor, repair any damaged wiring or connectors, or reprogram the engine control module if necessary.

6. Are there any DIY tips for troubleshooting OBDII code P0120 in an Isuzu?

You can start by checking the sensor's wiring and connectors for any visible damage, cleaning the sensor connector pins, and ensuring proper sensor alignment and mounting.

7. Is it necessary to reset the OBDII system after repairing code P0120 related to the Throttle Position Sensor 1 Circuit in my Isuzu?

Yes, it's recommended to clear the code and reset the OBDII system after repairing the issue to ensure the code doesn't reappear and to verify that the problem has been resolved.

8. Can a dirty throttle body cause OBDII code P0120 to trigger in an Isuzu?

While a dirty throttle body can affect throttle response, it is not a direct cause of code P0120. However, it's a good practice to keep the throttle body clean to prevent related issues.

9. Will a faulty oxygen sensor trigger OBDII code P0120 in an Isuzu?

No, a faulty oxygen sensor typically does not trigger code P0120. This code is specific to the Throttle Position Sensor 1 Circuit and is usually caused by issues related to that component.

10. Is professional help required to diagnose and repair OBDII code P0120 in an Isuzu related to the Throttle Position Sensor 1 Circuit?

While some DIY troubleshooting is possible, diagnosing and repairing code P0120 may require specialized tools and expertise. It is often best to seek professional help for accurate diagnosis and proper repair.

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