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P1900 Lincoln Code - Output Shaft Speed Circuit Intermittent Malfunction

Quick Answer

The P1900 diagnostic trouble code (DTC) for Lincoln vehicles indicates an intermittent malfunction in the output shaft speed circuit. Common causes include Faulty output shaft speed sensor: The sensor may be faulty or malfunctioning, providing inaccurate data to the ECU, Wiring issues: Damaged or corroded wiring connections to the sensor can cause intermittent signal loss, ECU malfunction: The vehicle's computer control unit (ECU) may be faulty, leading to incorrect transmission control. 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
P1900 Lincoln indicates Output Shaft Speed Circuit Intermittent Malfunction.
Common causes
Common causes include Faulty output shaft speed sensor: The sensor may be faulty or malfunctioning, providing inaccurate data to the ECU, Wiring issues: Damaged or corroded wiring connections to the sensor can cause intermittent signal loss, ECU malfunction: The vehicle's computer control unit (ECU) may be faulty, leading to incorrect transmission control.
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 P1900 Lincoln Description

The P1900 diagnostic trouble code (DTC) for Lincoln vehicles indicates an intermittent malfunction in the output shaft speed circuit. In automatic transmission vehicles, the output shaft speed sensor is responsible for monitoring the rotational speed of the output shaft, which is critical for determining the appropriate gear ratio and ensuring smooth transmission shifting. When this sensor fails to provide accurate data or experiences intermittent issues, it can lead to a variety of problems that affect the vehicle's performance and drivability.

OBDII Code P1900 Lincoln - Output Shaft Speed Circuit Intermittent Malfunction
P1900 Lincoln Code - Output Shaft Speed Circuit Intermittent Malfunction

Common Causes of P1900 Lincoln

  1. Faulty output shaft speed sensor: The sensor may be faulty or malfunctioning, providing inaccurate data to the ECU.
  2. Wiring issues: Damaged or corroded wiring connections to the sensor can cause intermittent signal loss.
  3. ECU malfunction: The vehicle's computer control unit (ECU) may be faulty, leading to incorrect transmission control.
  4. Mechanical issues: Internal transmission problems or issues with the output shaft itself can trigger this code.

Symptoms of P1900 Lincoln

  1. Erratic shifting: The transmission may shift unpredictably or jerk when changing gears.
  2. Hesitation during acceleration: The vehicle may hesitate or struggle to accelerate smoothly.
  3. Transmission slipping: The transmission may slip out of gear or fail to engage properly.
  4. Check engine light: The check engine light may illuminate on the dashboard.

How to Fix P1900 Lincoln

  1. Diagnose the issue: Use a diagnostic scan tool to retrieve the fault codes and perform a thorough inspection of the output shaft speed sensor and related components.
  2. Replace the output shaft speed sensor: If the sensor is found to be faulty, replace it with a new one to restore proper function.
  3. Check wiring connections: Inspect the wiring harness for any damage or corrosion, and repair or replace as needed.
  4. Reset the ECU: Clear the fault codes and reset the ECU to ensure that the new sensor is recognized and operating correctly.
  5. Test drive: After completing the repairs, test drive the vehicle to ensure that the transmission is shifting smoothly and the issue has been resolved.

Cost to Fix P1900 Lincoln

The typical repair costs for addressing a P1900 DTC can vary depending on the specific cause of the issue and the labor rates in your area. In general, replacing the output shaft speed sensor and addressing any wiring issues may cost between $150 and $300 for parts and labor. However, additional costs may apply if there are underlying mechanical problems or if the ECU needs to be replaced. It's advisable to consult with a qualified mechanic or auto repair shop to get a more accurate estimate based on your vehicle's make and model, as well as your location. Keep in mind that labor rates can vary significantly, with rates ranging from $80 to $150 per hour.

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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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