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Engine-Codes – Isuzu – P0122 Isuzu

P0122 Isuzu Code - Throttle Position Sensor 1 Circuit Low Voltage

Quick Answer

The P0122 Isuzu code indicates a problem with the throttle position sensor (TPS) circuit, specifically that the voltage is lower than expected. Common causes include A faulty throttle position sensor, Damaged or corroded wiring/connectors in the TPS circuit, 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
P0122 Isuzu indicates Throttle Position Sensor 1 Circuit Low Voltage.
Common causes
Common causes include A faulty throttle position sensor, Damaged or corroded wiring/connectors in the TPS circuit, 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 P0122 Isuzu Description

The P0122 Isuzu code indicates a problem with the throttle position sensor (TPS) circuit, specifically that the voltage is lower than expected. The TPS is a crucial component that monitors the position of the throttle valve and sends signals to the engine control module (ECM) to adjust fuel delivery and ignition timing accordingly. When the TPS circuit voltage is too low, it can lead to incorrect fuel and air mixture, affecting the engine's performance and efficiency.

OBDII Code P0122 Isuzu - Throttle Position Sensor 1 Circuit Low Voltage
P0122 Isuzu Code - Throttle Position Sensor 1 Circuit Low Voltage

Common Causes of P0122 Isuzu

  1. A faulty throttle position sensor.
  2. Damaged or corroded wiring/connectors in the TPS circuit.
  3. Malfunctioning engine control module (ECM).
  4. Issues with the throttle body, such as carbon buildup or mechanical damage.

Symptoms of P0122 Isuzu

  1. Poor acceleration or hesitation when pressing the gas pedal.
  2. Rough idling or stalling when at a stop.
  3. Reduced fuel efficiency and increased emissions.
  4. Difficulty starting the engine or erratic idling speed.

How to Fix P0122 Isuzu

  1. Diagnose the issue using a scan tool to confirm the P0122 code and identify the specific cause.
  2. Inspect the throttle position sensor, wiring, and connectors for any visible damage or corrosion.
  3. Test the TPS circuit voltage and resistance to determine if the sensor is functioning correctly.
  4. Replace the throttle position sensor if it is found to be faulty, ensuring proper installation and calibration.
  5. Clear the diagnostic trouble codes from the ECM and perform a test drive to confirm that the issue has been resolved.

Cost to Fix P0122 Isuzu

The typical repair costs for addressing a P0122 Isuzu code can vary depending on the specific cause of the issue. In general, replacing a faulty throttle position sensor can range from $100 to $200, including parts and labor. However, if additional components or wiring need to be replaced, the cost may increase. It's important to consider the specific diagnosis time and labor rates at auto repair shops, which can vary based on location, vehicle make and model, and engine type. Checking with local shops for more precise estimates is advisable.

When is the Code Detected?

An excessively low 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 P0122 Isuzu Code

1. What are the common symptoms of OBDII code P0122 in an Isuzu related to the Throttle Position Sensor 1 Circuit Low Voltage?

The common symptoms include poor acceleration, stalling, rough idling, and potential difficulty shifting gears.

2. What are the possible causes of the Throttle Position Sensor 1 Circuit Low Voltage error code P0122 in an Isuzu?

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

3. How can I diagnose the Throttle Position Sensor 1 Circuit Low Voltage issue in my Isuzu when the P0122 code appears?

You can use a multimeter to test the throttle position sensor's voltage output, check for damaged wiring or connectors, and inspect the sensor circuit for corrosion or other issues.

4. Is it safe to continue driving my Isuzu with the P0122 code indicating a Throttle Position Sensor 1 Circuit Low Voltage issue?

It is not recommended to drive your Isuzu with this issue as it can lead to poor engine performance, reduced fuel efficiency, and potential safety hazards due to unpredictable throttle response.

5. Can I reset the OBDII code P0122 related to the Throttle Position Sensor issue in my Isuzu without fixing the underlying problem?

Resetting the code without addressing the root cause will only temporarily clear the error code, and the issue will likely reoccur. It's best to diagnose and repair the problem to prevent further issues.

6. How can I repair the Throttle Position Sensor 1 Circuit Low Voltage problem causing the P0122 code in my Isuzu?

Repair methods may involve replacing the throttle position sensor, repairing or replacing damaged wiring or connectors, cleaning the sensor circuit, or reprogramming the engine control module.

7. Are there any preventative maintenance tips to avoid encountering the P0122 code in an Isuzu due to Throttle Position Sensor issues?

Regularly inspecting and cleaning the throttle position sensor, checking the wiring and connectors for damage, and following the manufacturer's recommended maintenance schedule can help prevent this issue.

8. Will a faulty Throttle Position Sensor always trigger the P0122 code in an Isuzu, or are there other potential error codes related to this component?

While a faulty Throttle Position Sensor can trigger the P0122 code, it can also lead to other related error codes like P0121 (Throttle Position Sensor/Switch A Circuit Range/Performance Problem) or P0123 (Throttle Position Sensor/Switch A Circuit High Input).

9. Can extreme weather conditions or environmental factors contribute to the occurrence of the Throttle Position Sensor 1 Circuit Low Voltage issue in an Isuzu?

Yes, extreme temperatures, moisture exposure, or harsh environmental conditions can potentially affect the performance of the throttle position sensor and lead to the P0122 error code.

10. How long does it typically take to repair the Throttle Position Sensor 1 Circuit Low Voltage problem causing the P0122 code in an Isuzu?

The repair time can vary depending on the exact cause of the issue, but it may take anywhere from 1-3 hours to complete the necessary diagnostic tests, repairs, and sensor replacement.

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