P0380 on Chevrolet: How to Diagnose & Fix
Glow Plug/Heater Circuit A Malfunction
1 Chevrolet model · 1 documented issue · $200-$800 repair
P0380 on Chevrolet by model: symptoms, diagnosis and fix
Glow plugs fail causing difficult cold weather starting. Can also swell and break during removal, requiring extraction. Glow plug module can also fail.
Common Symptoms
- Hard starting in cold weather
- Extended cranking
- White smoke on cold start
- Glow plug indicator stays on too long
- Rough idle when cold
How to Fix
Replace failed glow plugs. Use penetrating oil and heat to prevent breakage during removal. Replace glow plug controller module if diagnostics indicate module failure.
Sources for this issue (1)
P0380 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0380 mean on a Chevrolet?
P0380 stands for "Glow Plug/Heater Circuit A Malfunction." P0380 applies to diesel engines and means the computer detected a malfunction in glow plug heater circuit 'A'. Glow plugs preheat the combustion chambers to help a cold diesel start, and the control module monitors the glow plug circuit (often through a relay/control module); when the current or voltage isn't what it expects, it sets this code. The most noticeable symptom is hard cold starting, rough running until warm, or extra white smoke at startup. It indicates an electrical fault in the glow plug system rather than a fuel-injection problem. On Chevrolet it is documented across 1 model: Silverado 3500HD.
What are the most common causes of P0380?
The most common causes of P0380 are: One or more failed glow plugs, Faulty glow plug control module or relay, Corroded or loose glow plug wiring/connectors, Open or shorted glow plug circuit wiring, Blown glow plug fuse, Poor power feed or ground to the glow plug circuit, Failed driver in the engine control module. The specific cause varies by vehicle.
How much does it cost to fix P0380 on a Chevrolet?
Published repair estimates on Chevrolet range from $200 to $800 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0380 on a different make?
View P0380 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.