P037D Glow sensor circuit
OBD2 Error Codes

P037D Glow sensor circuit

26.05.2022 /

P037D Glow sensor circuit

OBD-II DTC Datasheet

Glow plug sensor circuit

What does this mean?

This Diagnostic Trouble Code (DTC) is a generic transmission code, which means it applies to OBD-II equipped vehicles with glow plugs (diesel vehicles). Vehicle brands may include, but are not limited to, Ford, Dodge, Mazda, VW, Ram, GMC, Chevy, etc. Although generic, specific repair steps may vary depending on the brand / model / engine. Ironically, this code seems to be more common on Ford vehicles.

Glow plugs and their associated harnesses and circuits are part of the system that generates heat in the combustion chamber prior to a cold start.

Basically, a glow plug is like an element on a stove. They are built into diesel engines because diesel engines do not use a spark plug to ignite the air / fuel mixture. Rather, they use compression to generate enough heat to ignite the mixture. For this reason, diesel engines need glow plugs for cold starts.

The ECM issues a P037D and related codes when it monitors a condition outside a specified range in the glow plug circuit. Most of the time I would say it is an electrical issue, but some mechanical issues can affect the glow plug circuitry on some makes and models. P037D Glow plug control circuit code is set when the ECM monitors one or more values ​​outside a specified range.

Glow plug example: P037D Glow sensor circuit

NOTE. If other indicators on the dashboard are currently on (for example, traction control, ABS, etc.), this could be a sign of another potentially more serious problem. In this case, you should bring your vehicle to a reputable store where they can connect with a suitable diagnostic tool to avoid unnecessary harm.

This DTC is closely related to P037E and P037F.

What is the severity of this DTC?

Generally speaking, the severity of this code will be medium, but depending on the scenario, it can be serious. For example, if you live in moderate to extreme cold conditions, repeated cold starts with faulty glow plugs will ultimately result in unnecessary damage to internal engine components.

What are some of the symptoms of the code?

Symptoms of a P037D engine code may include:

  • Hard to start in the morning or when it's cold
  • Abnormal engine noises when starting
  • Low productivity
  • Engine misfire
  • Poor fuel consumption

What are some of the common causes for the code?

Reasons for this code may include:

  • Broken or damaged wire harness
  • Fusible link burnt out / faulty
  • Glow plug defective
  • ECM problem
  • Pin / connector problem. (e.g. corrosion, overheating, etc.)

What are the troubleshooting steps?

Be sure to check the Technical Service Bulletins (TSB) for your vehicle. Gaining access to a known fix can save you time and money during diagnostics.

Tools

Whenever you work with electrical systems, it is recommended that you have the following basic tools:

  • OBD code reader
  • multimeter
  • Basic set of sockets
  • Basic Ratchet and Wrench Sets
  • Basic screwdriver set
  • Rag / shop towels
  • Battery terminal cleaner
  • Service manual

Security

  • Let the engine cool down
  • Chalk circles
  • Wear PPE (Personal Protective Equipment)

Basic step # 1

The first thing I would do in this situation is to shake out the hood and smell any irregular burning smells. If it is present, this may be due to your problem. In most cases, a strong burning smell means something is overheating. Keep a close eye on the smell, if you see any burnt wire coatings or melted plastic around fuse blocks, fuse links, etc., this needs to be fixed first.

NOTE. Inspect all grounding straps for rusty or loose ground connections.

Basic step # 2

Locate and trace the glow plug chain harness. These harnesses are subject to intense heat, which can damage the looms designed to protect your wires. Take special care to keep the seat belt free from stains that could touch the engine or other components. Repair damaged wires or looms.

Basic tip # 3

If possible, disconnect the glow plug harness from the spark plugs. In some cases, you can detach it from the other side of the seat belt and remove it completely from the vehicle assembly. In this case, you can use a multimeter to check the integrity of the individual wires in the circuit. This would eliminate a physical problem with this harness. This may not be possible in some vehicles. If not, skip the step.

NOTE. Be sure to disconnect the battery before performing any electrical repairs.

Basic step # 4

Check your circuits. Consult the manufacturer for the specific electrical values ​​required. Using a multimeter, you can perform many tests to check the integrity of the circuits involved.

Basic step # 5

Check your glow plugs. Disconnect the harness from the plugs. Using a multimeter set to voltage, you attach one end to the positive terminal of the battery and the other end to touch the tip of each plug. The values ​​must be the same as the battery voltage, otherwise it indicates a problem inside the plug itself. This may vary depending on the make and model of your particular vehicle, so ALWAYS ALWAYS refer to the manufacturer's service information first.

Related DTC discussions

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Need more help with your P037D code?

If you still need help regarding DTC P037D, post a question in the comments below this article.

NOTE. This information is provided for informational purposes only. It is not intended to be used as a repair recommendation and we are not responsible for any action you take on any vehicle. All information on this site is protected by copyright.

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