P0380Medium urgency

Glow Plug/Heater Circuit A Malfunction

Engine · Diesel Cold Start

⚠️ Fix before cold weather — hard starts in cold temperatures.

What this means

A glow plug or its circuit has failed on a diesel engine. Glow plugs preheat the combustion chamber for cold starts. A failed glow plug causes hard starts in cold weather and white smoke at startup.

Likely causes

Failed glow plug(s)Most common
Blown glow plug fuseCommon
Failed glow plug relayCommon

Estimated repair cost

Glow plug replacement (per plug)$20 – $60

All glow plugs (set of 4)$100 – $300

Glow plug relay$30 – $100

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Frequently asked questions

What does P0380 mean?

A glow plug or its circuit has failed on a diesel engine. Glow plugs preheat the combustion chamber for cold starts. A failed glow plug causes hard starts in cold weather and white smoke at startup.

Is P0380 serious?

Fix before cold weather — hard starts in cold temperatures.

How much does it cost to fix P0380?

Repair costs for P0380 range from $20 – $60 depending on the root cause and your vehicle.

Can I drive with P0380?

You can drive short distances but should have it repaired within 1-2 weeks to prevent further damage.