P0382Glow Plug/Heater Circuit B
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P0382 is the counterpart of P0380 for glow plug circuit B – depending on the manufacturer the second group of plugs, glow relay 2 or feedback line B of the glow plug control module. A code-specific manufacturer description exists from Saab: the 3.0 TiD V6 diesel in the 9-5 (2002) reads two feedback lines from its glow plug control module, and if line B stays above 4.0 V for more than 3 s while glowing, the module is reporting a fault in the second group of plugs; the check runs once per drive cycle, the warning lamp comes on and there is no further system reaction. Newer GM and Ford diesels report single plugs under P0671 ff and do not use P0382. CARB requires glow plug circuits to be monitored for correct current and voltage drop. The typical consequence is a poor cold start with smoke.
- What you may notice
- Hard starting when cold, long cranking
- White or blue smoke and rough running after a cold start
- Glow plug light or check engine light on or flashing
- Likely causes
- LikelyGlow plug(s) in circuit B burnt out
- PossibleGlow plug control module or glow relay 2 faulty
- PossibleFeedback line B, plug connector or busbar faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.