AutoCodes – Mercury – P1901 Mercury

P1901 Mercury Code - Turbine Shaft Speed Sensor Circuit Intermittent

Quick Answer

The Turbine Shaft Speed (TSS) sensor is a Hall-effect pickup that sends a signal to the Powertrain Control Module (PCM) or Transmission Control Module (TCM) that indicates transaxle turbine shaft input speed. Common causes include Turbine Shaft Speed (TSS) sensor not installed correctly, Faulty Turbine Shaft Speed sensor, Turbine Shaft Speed sensor harness is open or shorted. 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 Mercury indicates Turbine Shaft Speed Sensor Circuit Intermittent.
Common causes: Common causes include Turbine Shaft Speed (TSS) sensor not installed correctly, Faulty Turbine Shaft Speed sensor, Turbine Shaft Speed sensor harness is open or shorted.
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.

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Code Popularity 1,623

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 13, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1901 Mercury Description

The Turbine Shaft Speed (TSS) sensor is a Hall-effect pickup that sends a signal to the Powertrain Control Module (PCM) or Transmission Control Module (TCM) that indicates transaxle turbine shaft input speed. The TSS sensor provides converter turbine speed information for the Torque Converter Clutch strategy. Also used in determining static Line Pressure Control (LPC) pressure settings. The Diagnostic Trouble Code (DTC) will set when the TSS sensor signal to the PCM is irregular or interrupted.

OBDII Code P1901 Mercury - Turbine Shaft Speed Sensor Circuit Intermittent - AutoCodes.com — P1901 Mercury Code - Turbine Shaft Speed Sensor Circuit Intermittent

What does this mean?

What are the Possible Causes of the DTC P1901 Mercury?

Turbine Shaft Speed (TSS) sensor not installed correctly
Faulty Turbine Shaft Speed sensor
Turbine Shaft Speed sensor harness is open or shorted
Turbine Shaft Speed sensor circuit poor electrical connection

How to Fix the DTC P1901 Mercury?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1901 Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1901 Mercury code?

Need more information on how to fix the P1901 Mercury code? Get Access to Factory Service Manuals

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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 P1901 Mercury Code

What does the OBDII code P1901 mean for a Mercury vehicle?

P1901 indicates an intermittent issue in the turbine shaft speed sensor circuit, which monitors the rotational speed of the turbine inside the transmission.

What are the common symptoms of code P1901 in a Mercury?

Common symptoms include erratic shifting, transmission slipping, poor acceleration, or the illumination of the Check Engine Light.

What causes the P1901 code to appear in a Mercury?

The code can be caused by a faulty turbine shaft speed sensor, damaged wiring or connectors, poor electrical connections, or issues with the powertrain control module (PCM).

How do I diagnose a P1901 code?

Start by inspecting the turbine shaft speed sensor, wiring, and connectors for damage or corrosion. Use a multimeter to test the sensor's resistance and check for signal continuity.

Can I drive my Mercury with a P1901 code?

Driving with a P1901 code is not recommended as it can lead to further transmission issues, poor performance, and potential safety concerns.

How is the P1901 code fixed?

Repairs may include replacing the turbine shaft speed sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming/updating the PCM if necessary.

How much does it cost to repair a P1901 code?

Repair costs can range from $150 to $400, depending on whether the turbine shaft speed sensor or wiring needs replacement and labor rates in your area.

Can low transmission fluid cause the P1901 code?

While low transmission fluid may affect transmission performance, it is not a direct cause of the P1901 code. However, itâ€™s essential to check fluid levels during diagnosis.

What tools are needed to troubleshoot the P1901 code?

Youâ€™ll need an OBDII scanner, a multimeter, and potentially a repair manual for your specific Mercury model to locate and test the turbine shaft speed sensor and related components.

Does the P1901 code always mean the sensor is bad?

No, the issue could also stem from damaged wiring, poor connections, or a malfunctioning PCM, so thorough diagnosis is crucial before replacing parts.