Battery, charging and glow plugs

P0382 Glow plug circuit: fault ("B")

By: Diagno editorial team · Updated: 2026-10-15

P0382 means: Glow plug circuit: fault ("B"). Glow plugs heat the diesel engine's cylinders for cold starts. Drive gently and have the car checked soon. The repair usually costs about €40–400 in Estonia. The most common cause: burnt-out glow plug. Other possible causes: glow plug module or relay, wire or connector at the plug.

Is it safe to drive?Get it checked soonDrive gently and have the car checked soon.

Typical repair cost€40–400parts and labour in Estonia

What it means

Glow plugs heat the diesel engine's cylinders for cold starts. The computer found a fault in a plug or the glow plug module circuit.

What you may notice

Hard cold starts
White smoke after starting
Glow plug light flashing

What could be wrong

1Burnt-out glow plug
2Glow plug module or relay
3Wire or connector at the plug
4Fuse

Repair difficulty: Moderate

What you can check yourself

In cold weather start the engine only once the glow plug light has gone out. Fix it before the frosts if you can. You can check the simple things yourself, but the repair is best done in a workshop.

How we fix it

We measure each plug's resistance
We check the module and wiring
We replace the plug or module

Standard SAE description: Glow Plug/Heater Circuit "B"

Related symptoms: Smoke from the exhaust

Check the fuse · If a light, the horn, wipers, a socket or the fuel pump is dead, a blown fuse may be the cause.Fuse boxes by car →

Want a definite answer?

Bring the car to our workshop in Estonia for diagnostics. We read the fault codes, test the sensors and tell you what is wrong. Repair price depends on the work involved, generally €45 per hour.

Book a diagnostic check

Questions

What does fault code P0382 mean?

Glow plug circuit: fault ("B"). Glow plugs heat the diesel engine's cylinders for cold starts. The computer found a fault in a plug or the glow plug module circuit.

Can I drive with code P0382?

Drive gently and have the car checked soon.

How much does it cost to fix P0382?

Roughly €40–400 in Estonia. The price depends on exactly what has failed and on the car.

How is P0382 fixed?

We measure each plug's resistance. We check the module and wiring. We replace the plug or module.

Based on AI combined with our hands-on workshop experience and knowledge. This information is general and prices are approximate (Estonian workshop rates). The same code can mean different things on different cars. Only an inspection of the car gives a definite answer.