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P2109 Mercury Code - Throttle/Pedal Position Sensor 'A' Minimum Stop Performance

Quick Answer

The P2109 diagnostic trouble code (DTC) for Mercury vehicles indicates an issue with the Throttle/Pedal Position Sensor 'A' Minimum Stop Performance. Common causes include Faulty throttle pedal position sensor, Wiring issues or a poor connection between the sensor and ECM, Malfunctioning 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
P2109 Mercury indicates Throttle/Pedal Position Sensor 'A' Minimum Stop Performance.
Common causes
Common causes include Faulty throttle pedal position sensor, Wiring issues or a poor connection between the sensor and ECM, Malfunctioning 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 09, 2024
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Code P2109 Mercury Description

The P2109 diagnostic trouble code (DTC) for Mercury vehicles indicates an issue with the Throttle/Pedal Position Sensor 'A' Minimum Stop Performance. This code specifically relates to the sensor that monitors the position of the throttle pedal in relation to the throttle body. The throttle pedal position sensor is a crucial component of the vehicle's electronic throttle control system, which regulates the amount of air entering the engine to control the vehicle's speed.

OBDII Code P2109 Mercury - Throttle/Pedal Position Sensor 'A' Minimum Stop Performance
P2109 Mercury Code - Throttle/Pedal Position Sensor 'A' Minimum Stop Performance

Common Causes of P2109 Mercury

  1. Faulty throttle pedal position sensor.
  2. Wiring issues or a poor connection between the sensor and ECM.
  3. Malfunctioning throttle body.
  4. ECM software or hardware problems.
  5. Environmental factors such as moisture or corrosion affecting sensor performance.

Symptoms of P2109 Mercury

  1. Poor acceleration or lack of response when pressing the throttle pedal.
  2. Rough idling or stalling when coming to a stop.
  3. Reduced engine power or going into limp mode.
  4. Check Engine Light illuminated on the dashboard.
  5. Difficulty maintaining a consistent speed while driving.

How to Fix P2109 Mercury

  1. Begin by conducting a thorough diagnosis using a diagnostic scanner to confirm the P2109 code and pinpoint the exact cause of the issue.
  2. Inspect the throttle pedal position sensor and its wiring for any signs of damage or wear. Replace the sensor if necessary.
  3. Check the throttle body for proper operation and clean it if there is any debris or buildup present.
  4. Test the ECM for any faults or reprogram it if needed to ensure proper communication with the sensor.
  5. Clear the DTC and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P2109 Mercury

The typical repair costs for addressing a Throttle/Pedal Position Sensor 'A' Minimum Stop Performance issue can range from $200 to $500, including parts and labor. However, the 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. It's recommended to check with local shops for a more accurate estimate before proceeding with the repair. Keep in mind that rates may be higher in metropolitan areas or at dealerships, while independent shops may offer more competitive pricing.

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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.

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