P0380 on Audi: How to Diagnose & Fix
Glow Plug/Heater Circuit A Malfunction
1 Audi model · 1 documented issue · $150-$600 repair
P0380 on Audi by model: symptoms, diagnosis and fix
Glow plugs can fail, making cold starting difficult, especially in cold weather. The CBEA/CJAA engines use 'smart' glow plugs with integrated cylinder pressure sensors. OEM glow plug: 03L905061F (superseded to 03L905061K, then 03L905061M, current: 03L905061L). 4 plugs per engine. Glow plug control module (J179): 03L907281 (superseded to 03L907281B). Failed glow plugs can break during removal, requiring special extraction.
Common Symptoms
- Hard starting in cold weather
- Extended crank time
- White smoke on cold start
- Glow plug warning light
- Rough running when cold
How to Fix
Test glow plugs with VCDS if cold start issues occur - each plug can be tested individually. Replace failed glow plugs carefully - they can seize in the head. Soak with penetrating oil before removal. Use anti-seize on new plugs. Glow plug connector wiring (04L971785C) often breaks during service and should be kept on hand. Replace glow plug control module (03L907281) if faulty.
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 Audi?
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 Audi it is documented across 1 model: A3.
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 Audi?
Published repair estimates on Audi range from $150 to $600 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.