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Engine-Codes – Generic – P1937

P1937 Code - Vehicle Speed Signal

Quick Answer

The P1937 diagnostic trouble code (DTC) relates to the vehicle speed signal. Common causes include Faulty vehicle speed sensor, Damaged wiring or connectors in the speed signal circuit, ECM malfunction. 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, Damaged wiring or connectors in the speed signal circuit, ECM malfunction.
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 Sep 11, 2024
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Code P1937 Description

The P1937 diagnostic trouble code (DTC) relates to the vehicle speed signal. This code indicates that there is a malfunction in the vehicle's speed signal circuit. The vehicle speed signal is crucial for various systems in the vehicle, including the transmission, engine control module (ECM), and anti-lock braking system (ABS). The vehicle speed signal is typically generated by a sensor located on the transmission or wheel hub, which sends data to the ECM to control functions such as shifting, fuel injection, and ABS operation.

OBDII Code P1937 - Vehicle Speed Signal
P1937 Code - Vehicle Speed Signal

Common Causes of P1937

  1. Faulty vehicle speed sensor
  2. Damaged wiring or connectors in the speed signal circuit
  3. ECM malfunction
  4. Corrosion or contamination in the sensor or wiring
  5. Vehicle speed sensor misalignment or incorrect installation

Symptoms of P1937

  1. Inaccurate speedometer readings
  2. Erratic shifting behavior
  3. ABS warning light illuminated
  4. Engine stalling
  5. Loss of cruise control functionality

How to Fix P1937

  1. Diagnose the issue by checking the vehicle speed sensor for proper operation using a multimeter.
  2. Inspect wiring and connectors for any damage or corrosion, repairing or replacing as necessary.
  3. Clear the DTC and test drive the vehicle to confirm that the issue has been resolved.
  4. If the problem persists, further diagnostic testing may be required to pinpoint the exact cause, such as checking the ECM for faults.
  5. Replace the faulty sensor, repair any wiring issues, or address ECM malfunctions as needed to ensure proper vehicle speed signal operation.

Cost to Fix P1937

The cost of repairing a P1937 DTC can vary depending on the specific cause of the issue and the labor rates in your area. Typically, replacing a vehicle speed sensor can cost between $100 and $300, including parts and labor. If wiring repairs or ECM diagnostics are needed, additional costs may apply. It's recommended to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on your vehicle's make and model. Labor rates can range from $80 to $150 per hour, so the total cost can fluctuate accordingly.

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Code P1937 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.

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.

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