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Engine-Codes – Isuzu – P1122 Isuzu

P1122 Isuzu Code - Throttle Position Sensor Circuit Higher Than Expected

Quick Answer

When the P1122 Isuzu diagnostic trouble code is triggered, it means that the throttle position sensor circuit is reading a higher voltage than expected by the Engine Control Module (ECM). Common causes include Faulty throttle position sensor, Damaged or corroded wiring in the TPS circuit, Issues with the 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
P1122 Isuzu indicates Throttle Position Sensor Circuit Higher Than Expected.
Common causes
Common causes include Faulty throttle position sensor, Damaged or corroded wiring in the TPS circuit, Issues with the 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 10, 2024
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Code P1122 Isuzu Description

When the P1122 Isuzu diagnostic trouble code is triggered, it means that the throttle position sensor circuit is reading a higher voltage than expected by the Engine Control Module (ECM). The throttle position sensor (TPS) is a crucial component that monitors the position of the throttle valve and sends this information to the ECM to adjust fuel delivery and ignition timing. If the TPS circuit is reporting a voltage higher than expected, it can lead to incorrect fuel and air mixture, affecting the vehicle's performance and fuel efficiency.

OBDII Code P1122 Isuzu - Throttle Position Sensor Circuit Higher Than Expected
P1122 Isuzu Code - Throttle Position Sensor Circuit Higher Than Expected

Common Causes of P1122 Isuzu

  1. Faulty throttle position sensor
  2. Damaged or corroded wiring in the TPS circuit
  3. Issues with the ECM
  4. Vacuum leaks in the intake system
  5. Other related sensor malfunctions

Symptoms of P1122 Isuzu

  1. Hesitation or jerking during acceleration
  2. Rough idling or stalling
  3. Reduced fuel efficiency
  4. Check Engine Light illuminated
  5. Lack of response when pressing the gas pedal

How to Fix P1122 Isuzu

  1. Connect a diagnostic scanner to retrieve the trouble codes and verify the P1122 code.
  2. Inspect the throttle position sensor and its wiring for any visible damage or corrosion.
  3. Test the TPS using a multimeter to ensure it is sending the correct voltage signals.
  4. Replace the throttle position sensor if it is found to be faulty.
  5. Clear the trouble codes and perform a test drive to verify that the issue has been resolved.

Cost to Fix P1122 Isuzu

The cost of repairing a P1122 Isuzu code can vary depending on the specific vehicle make and model, the location of the repair shop, and the extent of the issue. Typically, replacing a throttle position sensor can cost between $100 and $200 for the part, with additional costs for labor. Overall, the total repair cost can range from $150 to $400. It is advisable to consult with a professional mechanic to get an accurate estimate based on the specific circumstances of the vehicle.

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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 P1122 Isuzu Code

1. What are the common symptoms of OBDII code P1122 in an Isuzu related to the Throttle Position Sensor Circuit being higher than expected?

- Common symptoms include issues with acceleration, poor engine performance, stalling, and potentially even difficulty starting the vehicle.

2. What are the possible causes of the OBDII code P1122 in an Isuzu?

- The code P1122 can be triggered by a faulty throttle position sensor, a problem with the wiring or connections to the sensor, or issues with the engine control module.

3. How can I diagnose the cause of the OBDII code P1122 in my Isuzu?

- You can start by checking the wiring and connections to the throttle position sensor, testing the sensor itself for proper functionality, and using a scan tool to further diagnose the issue.

4. Is it safe to drive with OBDII code P1122 in an Isuzu?

- It is not recommended to drive with the code P1122 active, as it can lead to further engine problems and potential safety hazards. It's best to address the issue as soon as possible.

5. Can I reset the OBDII code P1122 in my Isuzu without fixing the underlying issue?

- While you can clear the code temporarily, it will likely reappear if the root cause is not addressed. It's important to fix the underlying problem to prevent further issues.

6. How much does it typically cost to repair OBDII code P1122 in an Isuzu?

- The cost of repairing the code P1122 can vary depending on the exact cause of the issue. It may involve replacing the throttle position sensor, repairing wiring, or reprogramming the engine control module.

7. Can I fix the OBDII code P1122 in my Isuzu myself, or do I need a professional mechanic?

- Depending on your level of automotive knowledge and experience, you may be able to address the issue yourself by following repair guides and using the necessary tools. However, if you are unsure, it's best to consult a professional mechanic.

8. Will OBDII code P1122 cause my Isuzu to fail an emissions test?

- Yes, the code P1122 can cause your Isuzu to fail an emissions test due to its impact on engine performance and emissions output. It's important to address the issue before undergoing an emissions test.

9. How long does it typically take to repair OBDII code P1122 in an Isuzu?

- The repair time for the code P1122 can vary depending on the exact cause of the issue and the complexity of the repair. It may take a few hours to a full day to diagnose and fix the problem.

10. Can extreme weather conditions affect the triggering of OBDII code P1122 in an Isuzu?

- Yes, extreme weather conditions can sometimes affect the throttle position sensor's performance, potentially leading to the triggering of the code P1122. It's important to consider environmental factors when diagnosing the issue.

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