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Engine-Codes – Generic – P037D

P037D Code - Glow Plug Sense Circuit

Quick Answer

The P037D diagnostic trouble code (DTC) refers to an issue with the glow plug sense circuit in a diesel engine vehicle. Common causes include Faulty glow plugs, Damaged wiring in the glow plug system, Malfunctioning glow plug control module. 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
P037D indicates Glow Plug Sense Circuit.
Common causes
Common causes include Faulty glow plugs, Damaged wiring in the glow plug system, Malfunctioning glow plug control module.
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 13, 2024
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Code P037D Description

The P037D diagnostic trouble code (DTC) refers to an issue with the glow plug sense circuit in a diesel engine vehicle. Glow plugs are essential components in diesel engines that help with cold starts by heating the air in the combustion chamber. The glow plug sense circuit is responsible for monitoring the voltage levels in the glow plug system to ensure proper operation. When this circuit malfunctions, it can lead to difficulties starting the engine, reduced fuel efficiency, and increased emissions.

OBDII Code P037D - Glow Plug Sense Circuit
P037D Code - Glow Plug Sense Circuit

Common Causes of P037D

  1. Faulty glow plugs
  2. Damaged wiring in the glow plug system
  3. Malfunctioning glow plug control module
  4. Corrosion or poor connections in the electrical system
  5. Issues with the engine's temperature sensor

Symptoms of P037D

  1. Difficulty starting the engine, especially in cold weather
  2. Rough idling or misfiring
  3. Decreased fuel efficiency
  4. Increased emissions
  5. Check engine light illuminated on the dashboard

How to Fix P037D

  1. Diagnose the glow plug system using a scan tool to pinpoint the exact cause of the issue.
  2. Inspect the glow plugs, wiring, and control module for any visible damage or corrosion.
  3. Test the glow plugs for proper resistance and functionality.
  4. Replace any faulty glow plugs, repair damaged wiring, or replace the glow plug control module as needed.
  5. Clear the DTC and reset the check engine light to ensure the issue has been resolved.

Cost to Fix P037D

The cost of repairing the glow plug sense circuit can vary depending on the extent of the damage and the specific components that need replacement. On average, the parts for this repair can range from $100 to $300, while labor costs can add another $100 to $200. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to get a quote from a trusted mechanic before proceeding with the repair.

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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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