OBD-II code · Powertrain (generic)
P037D Glow Plug Sense Circuit
The diagnostic feedback line that monitors glow plug current draw reports a general electrical fault — open, shorted, or out of plausibility. Used to verify each plug actually heats up.
Is it safe to drive with P037D?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySense circuit failed
Symptoms
- Glow plug warning light on (often orange coil symbol)
- Hard cold start or no start in cold weather
- White smoke from exhaust during warm-up
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- Parts involved
- Glow Plug, Glow Plug Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.