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P0642 Mitsubishi Code - Throttle Position Sensor Power Supply

Quick Answer

The P0642 diagnostic trouble code (DTC) in Mitsubishi vehicles specifically refers to an issue with the throttle position sensor (TPS) power supply. Common causes include Faulty throttle position sensor: The TPS sensor itself may be faulty and not providing accurate readings to the ECM, Wiring issues: Damaged or corroded wiring in the TPS power supply circuit can disrupt the signal between the sensor and the ECM, Connector problems: A corroded or loose connector between the TPS sensor and the ECM can cause intermittent power supply issues. 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
P0642 Mitsubishi indicates Throttle Position Sensor Power Supply.
Common causes
Common causes include Faulty throttle position sensor: The TPS sensor itself may be faulty and not providing accurate readings to the ECM, Wiring issues: Damaged or corroded wiring in the TPS power supply circuit can disrupt the signal between the sensor and the ECM, Connector problems: A corroded or loose connector between the TPS sensor and the ECM can cause intermittent power supply issues.
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 P0642 Mitsubishi Description

The P0642 diagnostic trouble code (DTC) in Mitsubishi vehicles specifically refers to an issue with the throttle position sensor (TPS) power supply. The throttle position sensor is a crucial component of the vehicle's electronic fuel injection system, as it monitors the position of the throttle valve and sends this information to the engine control module (ECM). The ECM uses this data to adjust the air-fuel mixture and ignition timing for optimal engine performance.

OBDII Code P0642 Mitsubishi - Throttle Position Sensor Power Supply
P0642 Mitsubishi Code - Throttle Position Sensor Power Supply

Common Causes of P0642 Mitsubishi

  1. Faulty throttle position sensor: The TPS sensor itself may be faulty and not providing accurate readings to the ECM.
  2. Wiring issues: Damaged or corroded wiring in the TPS power supply circuit can disrupt the signal between the sensor and the ECM.
  3. Connector problems: A corroded or loose connector between the TPS sensor and the ECM can cause intermittent power supply issues.
  4. ECM malfunction: In rare cases, the ECM itself may be malfunctioning, leading to the P0642 code.

Symptoms of P0642 Mitsubishi

  1. Rough idling: The vehicle may experience rough idling or fluctuations in engine speed when the throttle position sensor power supply is compromised.
  2. Poor acceleration: A malfunctioning TPS power supply can result in poor acceleration and sluggish performance when accelerating.
  3. Stalling: The vehicle may stall unexpectedly, especially when coming to a stop or while idling, due to incorrect throttle position readings.
  4. Limp mode: The vehicle may go into a limp mode, restricting power and performance to prevent further damage to the engine.

How to Fix P0642 Mitsubishi

  1. Diagnose the issue: Use a diagnostic scan tool to retrieve the specific trouble code and pinpoint the source of the problem.
  2. Inspect TPS sensor: Check the throttle position sensor for any signs of damage or wear and replace if necessary.
  3. Check wiring and connectors: Inspect the wiring harness and connectors for any damage, corrosion, or loose connections. Repair or replace as needed.
  4. Clear the code: After making any necessary repairs, clear the DTC using a diagnostic scan tool to reset the ECM and see if the issue has been resolved.
  5. Test drive: Take the vehicle for a test drive to ensure that the throttle response is smooth and there are no more symptoms associated with the P0642 code.

Cost to Fix P0642 Mitsubishi

The cost of repairing a P0642 code in a Mitsubishi vehicle can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of replacing a throttle position sensor can range from $50 to $200, while addressing wiring or connector issues may require additional labor costs. Including parts and labor, the total repair cost for a P0642 code could range from $150 to $500. However, it's important to note that prices can vary based on location, vehicle make and model, and the specific rates of the auto repair shop. It's recommended to obtain a detailed estimate from a trusted mechanic before proceeding with any repairs.

When is the Code Detected?

The Engine Control Module (ECM) has detected the sensor 5 volt reference circuit voltage is lower than expected

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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 P0642 Mitsubishi Code

1. What are the common symptoms of OBDII code P0642 in a Mitsubishi related to the throttle position sensor power supply?

The common symptoms include engine stalling, rough idling, reduced engine power, and difficulty accelerating.

2. What usually causes the OBDII code P0642 related to the throttle position sensor power supply in a Mitsubishi?

The code is typically triggered by a malfunction in the throttle position sensor power supply circuit, such as a short circuit or open circuit.

3. How can I diagnose the OBDII code P0642 in my Mitsubishi related to the throttle position sensor power supply?

Diagnosis involves checking the throttle position sensor wiring for damage, testing the sensor's voltage output, and inspecting the power supply circuit for faults.

4. Can a faulty throttle position sensor itself trigger the OBDII code P0642 in a Mitsubishi?

Yes, a faulty throttle position sensor can cause irregular voltage output, leading to the triggering of the P0642 code related to the sensor's power supply.

5. What are some repair tips for addressing the OBDII code P0642 in a Mitsubishi related to the throttle position sensor power supply?

Repair options include repairing damaged wiring, replacing the throttle position sensor, checking and repairing any power supply circuit issues, and clearing the trouble code.

6. Is it safe to continue driving my Mitsubishi with the OBDII code P0642 related to the throttle position sensor power supply?

It is not recommended to drive the vehicle with this code present, as it can lead to performance issues and potential safety hazards. It's best to address the problem promptly.

7. Can resetting the OBDII code P0642 related to the throttle position sensor power supply in a Mitsubishi solve the issue?

Resetting the code may temporarily turn off the check engine light, but it will not fix the underlying problem causing the code. Proper diagnosis and repair are necessary.

8. How much does it typically cost to repair the OBDII code P0642 in a Mitsubishi related to the throttle position sensor power supply?

The cost of repair can vary depending on the specific cause of the issue, but it may range from $100 to $300, including parts and labor.

9. Are there any preventative measures I can take to avoid the OBDII code P0642 related to the throttle position sensor power supply in my Mitsubishi?

Regularly inspecting and maintaining the throttle position sensor, as well as ensuring the wiring and connections are in good condition, can help prevent issues leading to this code.

10. Can a DIY enthusiast with basic automotive knowledge fix the OBDII code P0642 related to the throttle position sensor power supply in a Mitsubishi?

Depending on the cause of the issue, some DIY enthusiasts may be able to address the problem by following repair guides and using basic tools. However, more complex issues may require professional assistance.

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