AutoCodes – Mazda – P1937 Mazda

P1937 Mazda Code - Vehicle Speed Signal

Quick Answer

The Powertrain Control Module (PCM) monitors the Vehicle Speed Signal. Common causes include Faulty Vehicle Speed Sensor, Vehicle Speed Sensor harness is open or shorted, Vehicle Speed Sensor circuit poor electrical connection. 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: P1937 Mazda indicates Vehicle Speed Signal.
Common causes: Common causes include Faulty Vehicle Speed Sensor, Vehicle Speed Sensor harness is open or shorted, Vehicle Speed Sensor circuit poor electrical connection.
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 1,673

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 Aug 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1937 Mazda Description

The Powertrain Control Module (PCM) monitors the Vehicle Speed Signal. The PCM sets the Diagnostic Trouble Code (DTC) when the Vehicle Speed Signal is not to factory specifications.

OBDII Code P1937 Mazda - Vehicle Speed Signal - AutoCodes.com — P1937 Mazda Code - Vehicle Speed Signal

What does this mean?

What are the Possible Causes of the DTC P1937 Mazda?

Faulty Vehicle Speed Sensor
Vehicle Speed Sensor harness is open or shorted
Vehicle Speed Sensor circuit poor electrical connection

How to Fix the DTC P1937 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 P1937 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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Need more information on how to fix the P1937 Mazda 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 P1937 Mazda Code

1. What are the common symptoms of OBDII code P1937 in a Mazda related to the Vehicle Speed Signal?

The common symptoms include erratic speedometer readings, non-functioning cruise control, and potential issues with the transmission shifting.

2. What are the possible causes of OBDII code P1937 in a Mazda?

The code P1937 is usually triggered by a faulty vehicle speed sensor, damaged wiring or connectors, or a malfunctioning instrument cluster.

3. How can I diagnose the cause of OBDII code P1937 in my Mazda?

You can diagnose the issue by checking the vehicle speed sensor for proper functioning, inspecting the wiring and connectors for any damage, and using a diagnostic scanner to read live data from the vehicle.

4. Can a faulty vehicle speed sensor be repaired, or does it need to be replaced?

In most cases, a faulty vehicle speed sensor will need to be replaced rather than repaired. It is a relatively straightforward and affordable component to replace.

5. Are there any DIY repair tips for fixing OBDII code P1937 in a Mazda?

DIY enthusiasts can attempt to replace the vehicle speed sensor themselves using basic tools and following online tutorials or repair manuals specific to their Mazda model.

6. Will driving with OBDII code P1937 in a Mazda cause further damage to the vehicle?

Continuing to drive with code P1937 may lead to inaccuracies in speed readings and potential issues with the transmission, but it is unlikely to cause significant damage if addressed promptly.

7. Is it safe to drive my Mazda with the cruise control not working due to OBDII code P1937?

It is generally safe to drive without functioning cruise control. However, it is recommended to address the underlying issue causing code P1937 to ensure the vehicle's systems are functioning correctly.

8. How much does it typically cost to repair OBDII code P1937 in a Mazda at a professional auto repair shop?

The cost to repair code P1937 in a Mazda can vary depending on the specific cause of the issue, but it typically ranges from $100 to $300 for parts and labor.

9. Can OBDII code P1937 in a Mazda be related to other vehicle systems or codes?

Code P1937 is specific to the vehicle speed signal and is not directly related to other OBDII codes. However, it can sometimes be associated with transmission-related issues.

10. Will resetting the OBDII code P1937 in my Mazda make the issue go away permanently?

Resetting the code may temporarily clear the check engine light, but if the underlying issue causing code P1937 is not addressed, the code is likely to reappear. It is important to diagnose and fix the root cause of the problem.