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P0120 Mitsubishi Code - Throttle Position Sensor Circuit Malfunction

Quick Answer

The P0120 diagnostic trouble code (DTC) for Mitsubishi vehicles indicates a Throttle Position Sensor (TPS) Circuit Malfunction. Common causes include Worn or damaged throttle position sensor, Loose or corroded electrical connections, Faulty wiring or harness. 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 Mitsubishi indicates Throttle Position Sensor Circuit Malfunction.
Common causes
Common causes include Worn or damaged throttle position sensor, Loose or corroded electrical connections, Faulty wiring or harness.
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 Mitsubishi Description

The P0120 diagnostic trouble code (DTC) for Mitsubishi vehicles indicates a Throttle Position Sensor (TPS) Circuit Malfunction. The throttle position sensor is a crucial component of the engine management 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 determine the appropriate air-fuel mixture for combustion, ignition timing, and other engine functions. When the TPS circuit malfunctions, it can lead to a variety of performance issues and potential long-term effects if not addressed promptly.

OBDII Code P0120 Mitsubishi - Throttle Position Sensor Circuit Malfunction
P0120 Mitsubishi Code - Throttle Position Sensor Circuit Malfunction

Common Causes of P0120 Mitsubishi

  1. Worn or damaged throttle position sensor
  2. Loose or corroded electrical connections
  3. Faulty wiring or harness
  4. ECM software issues
  5. Throttle body malfunction

Symptoms of P0120 Mitsubishi

  1. Rough idling or stalling
  2. Poor acceleration or hesitation
  3. Engine misfires
  4. Check engine light illuminated
  5. Reduced fuel efficiency

How to Fix P0120 Mitsubishi

  1. Begin by diagnosing the issue using a diagnostic scanner to confirm the P0120 code.
  2. Inspect the throttle position sensor for any signs of wear or damage and replace if necessary.
  3. Check and clean electrical connections to ensure a secure connection.
  4. Test the wiring and harness for any faults or breaks and repair as needed.
  5. Reset the ECM and clear the trouble code to see if the issue persists.

Cost to Fix P0120 Mitsubishi

The typical repair costs for addressing a P0120 Throttle Position Sensor Circuit Malfunction can range from $100 to $300, including parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. It's advisable to check local rates for a more precise estimate.

When is the Code Detected?

Malfunction is detected when an excessively low or high voltage from the sensor is sent to 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 Mitsubishi Code

1. What are the common symptoms of OBDII code P0120 in a Mitsubishi related to the throttle position sensor circuit malfunction?

The common symptoms include issues with acceleration, poor engine performance, stalling, and difficulty maintaining a consistent speed.

2. What are the possible causes of the throttle position sensor circuit malfunction in a Mitsubishi triggering code P0120?

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

3. How can I diagnose the throttle position sensor circuit malfunction causing OBDII code P0120 in my Mitsubishi?

Diagnosis involves using a scan tool to read the trouble code, testing the throttle position sensor for proper voltage output, and inspecting the sensor wiring for any damage or loose connections.

4. Can a dirty throttle body cause the OBDII code P0120 in a Mitsubishi?

Yes, a dirty or clogged throttle body can disrupt the proper functioning of the throttle position sensor, leading to the circuit malfunction and triggering code P0120.

5. What are some repair tips for addressing the throttle position sensor circuit malfunction in a Mitsubishi with OBDII code P0120?

Repair tips include cleaning the throttle body, checking and replacing the throttle position sensor if necessary, inspecting and repairing any damaged wiring, and resetting the trouble code after repairs are completed.

6. Is it safe to continue driving my Mitsubishi with the OBDII code P0120 related to the throttle position sensor circuit malfunction?

It is not recommended to continue driving the vehicle with this issue as it can lead to further engine performance problems and potential safety concerns. It is best to address the problem promptly.

7. Can resetting the trouble code associated with OBDII code P0120 fix the throttle position sensor circuit malfunction in a Mitsubishi?

Resetting the trouble code may temporarily clear the warning light, but it will not fix the underlying issue causing the throttle position sensor circuit malfunction. Proper diagnosis and repair are necessary.

8. How much does it typically cost to repair the throttle position sensor circuit malfunction triggering OBDII code P0120 in a Mitsubishi?

The cost of repair can vary depending on the extent of the issue, the need for sensor replacement, and labor charges. It is advisable to consult with a mechanic for a more accurate estimate.

9. Are there any preventative maintenance steps I can take to avoid the throttle position sensor circuit malfunction and OBDII code P0120 in my Mitsubishi?

Regularly cleaning the throttle body, inspecting sensor wiring for damage, and ensuring proper engine maintenance can help prevent issues with the throttle position sensor circuit.

10. Can a DIY enthusiast with basic automotive knowledge repair the throttle position sensor circuit malfunction causing OBDII code P0120 in a Mitsubishi?

While some basic repairs like sensor replacement or cleaning can be done by DIY enthusiasts, diagnosing complex issues with the throttle position sensor circuit may require specialized tools and expertise, so seeking professional help is advisable.

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