P0382
Glow Plug/Heater Circuit B
A general electrical fault on glow-plug heater circuit B — typically the second bank of glow plugs on an inline-6 or V-engine.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
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
Common causes
Ordered by how often each turns out to be the cause.
- Glow plug or harness failedCommon
Parts involved
- Glow Plug
- Glow Plug Control Module
P0382 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.