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P0638 Mitsubishi Code - Throttle Actuator Control Range/Performance

Quick Answer

The P0638 diagnostic trouble code (DTC) for Mitsubishi vehicles relates to the throttle actuator control range/performance. Common causes include Faulty throttle actuator control module, Wiring issues or electrical connections, Dirty or faulty throttle body. 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
P0638 Mitsubishi indicates Throttle Actuator Control Range/Performance.
Common causes
Common causes include Faulty throttle actuator control module, Wiring issues or electrical connections, Dirty or faulty throttle body.
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 07, 2024
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Code P0638 Mitsubishi Description

The P0638 diagnostic trouble code (DTC) for Mitsubishi vehicles relates to the throttle actuator control range/performance. This code indicates that there is an issue with the throttle actuator control system, which is responsible for managing the opening and closing of the throttle valve in the engine. The throttle actuator control system plays a crucial role in regulating the amount of air that enters the engine, which in turn affects the fuel delivery and overall performance of the vehicle.

OBDII Code P0638 Mitsubishi - Throttle Actuator Control Range/Performance
P0638 Mitsubishi Code - Throttle Actuator Control Range/Performance

Common Causes of P0638 Mitsubishi

  1. Faulty throttle actuator control module
  2. Wiring issues or electrical connections
  3. Dirty or faulty throttle body
  4. Vacuum leaks in the intake system
  5. ECM software or programming issues

Symptoms of P0638 Mitsubishi

  1. Reduced engine power or acceleration
  2. Rough idling or stalling
  3. Illuminated Check Engine Light
  4. Difficulty starting the engine
  5. Poor fuel economy

How to Fix P0638 Mitsubishi

  1. Begin by conducting a thorough inspection of the throttle actuator control system, including checking for any visible damage or loose connections.
  2. Use a scan tool to read the trouble codes stored in the ECM and clear any codes related to the throttle actuator control system.
  3. Test the throttle actuator control module for proper functionality and replace it if necessary.
  4. Inspect and clean the throttle body to ensure smooth operation and proper airflow.
  5. Check for any vacuum leaks in the intake system and repair as needed.

Cost to Fix P0638 Mitsubishi

The cost of repairing a P0638 code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. Generally, the parts needed for this repair, such as a new throttle actuator control module, can range from $200 to $500. The labor costs for diagnosing and repairing this issue can add an additional $100 to $300. Overall, the total repair cost for addressing a P0638 code typically falls within the range of $300 to $800. It is advisable to contact local auto repair shops for more accurate pricing based on your vehicle make and model.

What does this mean?

Tech Notes for P0638 Mitsubishi

Dirty or clogged throttle body can triggered the P0638 code. Before replacing any parts try cleaning the throttle body and reset the engine light.

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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 P0638 Mitsubishi Code

1. What are the common symptoms of OBDII code P0638 in a Mitsubishi related to throttle actuator control range/performance?

- Common symptoms include poor acceleration, rough idling, stalling, and the vehicle going into limp mode.

2. What are the potential causes of OBDII code P0638 in a Mitsubishi related to throttle actuator control range/performance?

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

3. How can I diagnose the OBDII code P0638 in a Mitsubishi related to throttle actuator control range/performance?

- Diagnosing this code usually involves using an OBDII scanner to retrieve the code, checking the throttle actuator and related components for any visible damage, and performing electrical tests on the components.

4. What are some repair tips for fixing OBDII code P0638 in a Mitsubishi related to throttle actuator control range/performance?

- Repair tips may include replacing the throttle actuator if it is faulty, repairing or replacing damaged wiring or connectors, recalibrating the throttle position sensor, or reprogramming the engine control module.

5. Can I drive my Mitsubishi with OBDII code P0638 related to throttle actuator control range/performance?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage and potential safety issues. It is best to address the underlying problem as soon as possible.

6. How much does it typically cost to repair OBDII code P0638 related to throttle actuator control range/performance in a Mitsubishi?

- The cost of repair can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Can I reset the OBDII code P0638 related to throttle actuator control range/performance in a Mitsubishi by disconnecting the battery?

- While disconnecting the battery may clear the code temporarily, it is not a recommended method for fixing the underlying issue. The code is likely to return until the root cause is addressed.

8. Is it safe to continue driving my Mitsubishi if the throttle actuator control range/performance issue is intermittent?

- It is not recommended to continue driving the vehicle if the issue is intermittent, as it can unpredictably affect the performance of the vehicle and potentially lead to dangerous situations.

9. How long does it typically take to repair OBDII code P0638 related to throttle actuator control range/performance in a Mitsubishi?

- The repair time can vary depending on the complexity of the issue and the availability of parts, but it may take a few hours to a full day to diagnose and fix the problem.

10. Will fixing OBDII code P0638 in a Mitsubishi related to throttle actuator control range/performance improve fuel efficiency?

- Yes, addressing the underlying issue causing this code can help improve fuel efficiency by ensuring proper throttle control and engine performance.

Discuss the causes and fixes for P0638 Mitsubishi OBDII Code

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  • I have a P0638 engine error code on my Mitsubishi Grandis 2006 (UK model) , Have been told it needs a new throttle body . I fitted a second hand one and same error. It could be second hand throttle body also faulty. But also it could be faulty wiring or faulty engine management system module . Local Mitsubishi dealer will charge £750 plus vat for new throttle body, Can get a new part from Taiwan for around $178 (including postage !).

    Can anyone advise what is the best way forward ?

    Reply to Comment