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Engine-Codes – Generic – P1901

P1901 Code - Turbine Shaft Speed Sensor Circuit Intermittent

Quick Answer

The P1901 code indicates a problem with the Turbine Shaft Speed Sensor circuit. Common causes include Faulty Turbine Shaft Speed Sensor, Loose or corroded wiring/connectors in the sensor circuit, Issues with the transmission control module. 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
P1901 indicates Turbine Shaft Speed Sensor Circuit Intermittent.
Common causes
Common causes include Faulty Turbine Shaft Speed Sensor, Loose or corroded wiring/connectors in the sensor circuit, Issues with the transmission control module.
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 Aug 18, 2024
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Code P1901 Description

The P1901 code indicates a problem with the Turbine Shaft Speed Sensor circuit. The Turbine Shaft Speed Sensor is responsible for monitoring the speed of the transmission input shaft in automatic transmissions. This information is crucial for the transmission control module to determine shift points, torque converter lockup, and other important functions. An intermittent issue with this sensor could lead to erratic shifting, harsh shifting, transmission slipping, or even the transmission going into limp mode, where it only operates in one gear.

OBDII Code P1901 - Turbine Shaft Speed Sensor Circuit Intermittent
P1901 Code - Turbine Shaft Speed Sensor Circuit Intermittent

Common Causes of P1901

  1. Faulty Turbine Shaft Speed Sensor
  2. Loose or corroded wiring/connectors in the sensor circuit
  3. Issues with the transmission control module
  4. Electrical interference or shorts in the circuit
  5. Mechanical issues affecting the sensor operation

Symptoms of P1901

  1. Erratic shifting
  2. Harsh shifting
  3. Transmission slipping
  4. Limp mode (only operating in one gear)
  5. Check Engine Light illuminated

How to Fix P1901

  1. Diagnose the issue by using a scan tool to monitor the Turbine Shaft Speed Sensor readings and checking for any stored codes.
  2. Inspect the wiring and connectors for damage, corrosion, or looseness. Repair or replace as necessary.
  3. Test the Turbine Shaft Speed Sensor for proper operation and replace if faulty.
  4. Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue is resolved.
  5. If the problem persists, further diagnostics may be necessary to identify any underlying mechanical issues or problems with the transmission control module.

Cost to Fix P1901

The cost of repairing a Turbine Shaft Speed Sensor circuit intermittent issue can vary depending on the exact cause of the problem. On average, the cost of replacing a Turbine Shaft Speed Sensor ranges from $100 to $300, including parts and labor. However, additional costs may apply if there are other underlying issues that need to be addressed. It's recommended to consult with a qualified mechanic or automotive technician for a more accurate estimate based on the specific circumstances of your vehicle.

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Code P1901 Information for Specific Makes

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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