P037D OBD II Trouble Code Glow Plug Sense Circuit

How to quickly diagnose, repair, and info on symptoms and causes of a P037D code which is a malfunction in the glow plug sense circuit on diesel vehicles.

Symptoms of P037D OBD II Trouble Code

  • Hard starts in the morning or when cold
  • Abnormal engine noises on start-up
  • Poor performance
  • Engine misfiring
  • Poor fuel mileage

Common Causes of P037D OBD II Trouble Code

  • Broken or damaged wiring harness
  • Fusible link burnt/defective
  • Glow plug defective
  • ECM issue
  • Pin/connector problem. (i.e. corrosion, overheating etc.)

Severity of P037D OBD II Trouble Code

Generally speaking, the severity of this code would be moderate but depending on the scenario, it may be severe. For example, if you reside in moderate to extreme cold conditions, repetitive cold starts with malfunctioning glow plugs will eventually cause unnecessary damage to your internal engine components.