AutoCodes – Mazda – P1901 Mazda

P1901 Mazda Code - Turbine Shaft Speed Sensor 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 Mazda indicates Turbine Shaft Speed Sensor 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 2,091

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 Mazda 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 Mazda - Turbine Shaft Speed Sensor Intermittent - AutoCodes.com — P1901 Mazda Code - Turbine Shaft Speed Sensor Intermittent

What does this mean?

What are the Possible Causes of the DTC P1901 Mazda?

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 Mazda?

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 Mazda 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.

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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 Mazda Code

1. What does the OBDII code P1901 mean on a Mazda?

P1901 indicates an intermittent issue with the Turbine Shaft Speed Sensor, which monitors the rotational speed of the transmission's input shaft.

2. What are the symptoms of a P1901 code in a Mazda?

Common symptoms include erratic shifting, delayed acceleration, reduced fuel efficiency, and the check engine light turning on.

3. What causes a P1901 code to appear on a Mazda?

This code can be caused by a faulty turbine shaft speed sensor, damaged wiring or connectors, or transmission fluid contamination affecting sensor performance.

4. Can I drive my Mazda with a P1901 code?

Driving with this code is not recommended as it may cause transmission issues and further damage if the problem is not addressed promptly.

5. How is the P1901 code diagnosed on a Mazda?

A mechanic will use a scan tool to confirm the code, inspect the turbine shaft speed sensor and its wiring, and test the sensorâ€™s operation.

6. How do you fix the P1901 code on a Mazda?

Repairs may include replacing the turbine shaft speed sensor, repairing or replacing damaged wiring, or flushing and replacing contaminated transmission fluid.

7. How much does it cost to fix a P1901 code on a Mazda?

The repair cost varies but typically ranges from $150 to $400, depending on whether the sensor or wiring needs replacement.

8. Can low transmission fluid cause a P1901 code?

Yes, low or contaminated transmission fluid can affect the turbine shaft speed sensor's performance and trigger this code.

9. Is the P1901 code common in Mazdas?

While not extremely common, this code can occur in Mazdas with higher mileage or if the transmission has not been properly maintained.

10. How can I prevent the P1901 code from occurring on my Mazda?

Regularly check and maintain proper transmission fluid levels, ensure the fluid is clean, and address any transmission issues promptly to prevent sensor-related problems.