AutoCodes – Generic – P1937

P1937 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 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 6,567

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC P1937?

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?

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 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 P1937 code?

Need more information on how to fix the P1937 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1937 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1937 Ford — Vehicle Speed Signal
P1937 Lincoln — Vehicle Speed Signal
P1937 Mazda — Vehicle Speed Signal
P1937 Mercury — Vehicle Speed Signal

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 Code

1. What are the common symptoms of OBDII code P1937 (Vehicle Speed Signal)?

- Common symptoms include erratic speedometer readings, cruise control malfunctions, and the Check Engine Light being illuminated.

2. What can cause OBDII code P1937 to trigger?

- The code P1937 is typically triggered by a faulty vehicle speed sensor, damaged wiring or connectors related to the speed sensor, or a malfunctioning instrument cluster.

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

- To diagnose the cause of P1937, perform a visual inspection of the speed sensor and its wiring, test the speed sensor using a multimeter, and use a scan tool to monitor the vehicle speed signal data.

4. Can a faulty speedometer be the cause of OBDII code P1937?

- Yes, a faulty speedometer or instrument cluster can sometimes trigger code P1937 if it is not accurately receiving or transmitting vehicle speed signals.

5. Is it safe to continue driving with OBDII code P1937 present?

- While the vehicle may still be drivable with code P1937, it is recommended to address the issue promptly to prevent potential safety hazards and avoid further damage to the vehicle.

6. How do I repair OBDII code P1937?

- Repairing P1937 involves replacing a faulty vehicle speed sensor, repairing damaged wiring or connectors, or addressing any issues with the instrument cluster, depending on the root cause of the problem.

7. Can a DIY enthusiast fix OBDII code P1937 at home?

- Yes, depending on the underlying issue causing P1937, DIY enthusiasts with automotive repair experience can often address the problem at home with the right tools and resources.

8. Will resetting the OBDII system clear code P1937?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing P1937 is not addressed, the code is likely to reappear once the problem is detected again.

9. How long does it typically take to repair OBDII code P1937?

- The time required to repair P1937 varies depending on the root cause of the issue, the availability of parts, and the individual's repair skills, but it can generally be resolved within a few hours to a day.

10. Can extreme weather conditions affect the triggering of OBDII code P1937?

- Yes, extreme weather conditions such as heavy rain, snow, or extreme cold can sometimes impact the performance of the vehicle speed sensor and contribute to the triggering of code P1937.