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Engine-Codes – Mercury – P1937 Mercury

P1937 Mercury Code - Vehicle Speed Signal

Quick Answer

The P1937 diagnostic trouble code (DTC) pertains to the vehicle speed signal in Mercury vehicles. Common causes include Faulty vehicle speed sensor (VSS), Damaged or corroded wiring or connectors related to the speed signal, Malfunctioning ECM or TCM. 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 Mercury indicates Vehicle Speed Signal.
Common causes
Common causes include Faulty vehicle speed sensor (VSS), Damaged or corroded wiring or connectors related to the speed signal, Malfunctioning ECM or TCM.
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 Oct 17, 2024
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Code P1937 Mercury Description

The P1937 diagnostic trouble code (DTC) pertains to the vehicle speed signal in Mercury vehicles. This code indicates that the Engine Control Module (ECM) has detected an issue with the signal that communicates the vehicle's speed to various systems, including the transmission control module (TCM), anti-lock braking system (ABS), and the vehicle's speedometer. The vehicle speed signal is crucial for the proper operation of these systems, as it helps them make real-time adjustments based on the speed of the vehicle.

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

Common Causes of P1937 Mercury

  1. Faulty vehicle speed sensor (VSS).
  2. Damaged or corroded wiring or connectors related to the speed signal.
  3. Malfunctioning ECM or TCM.
  4. Issues with the transmission itself, such as low fluid levels or internal damage.
  5. Software glitches or calibration issues within the vehicle's control modules.

Symptoms of P1937 Mercury

  1. Erratic or inaccurate speedometer readings.
  2. Harsh or delayed transmission shifts.
  3. Activation of the check engine light.
  4. Reduced fuel efficiency.
  5. Malfunctioning ABS or traction control systems.

How to Fix P1937 Mercury

  1. Diagnostic Testing: Begin with a thorough diagnostic scan to confirm the P1937 code and check for any related codes that may provide additional context.
  2. Inspect Wiring and Connectors: Examine the wiring harness and connectors associated with the vehicle speed sensor for any signs of damage, corrosion, or loose connections.
  3. Test the Vehicle Speed Sensor: Use a multimeter to test the resistance and output of the vehicle speed sensor. If the sensor is faulty, it will need to be replaced.
  4. Check the ECM/TCM: If the speed sensor and wiring are in good condition, further diagnostics may be necessary to check the ECM or TCM for faults or software issues.
  5. Clear Codes and Test Drive: After repairs, clear the codes and take the vehicle for a test drive to ensure that the issue has been resolved and that the vehicle speed signal is functioning correctly.

Cost to Fix P1937 Mercury

The cost to repair a P1937 code can vary widely based on the specific issue identified during diagnosis. Generally, replacing a faulty vehicle speed sensor can range from $100 to $300, including parts and labor. If wiring repairs are needed, costs may increase to $150 to $500, depending on the extent of the damage. If the ECM or TCM requires reprogramming or replacement, costs can escalate significantly, potentially reaching $1,000 or more.

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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.

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