P0480 on GMC: How to Diagnose & Fix
Cooling Fan 1 Control Circuit
1 GMC model · 1 documented issue · 1 critical · $200-$500 repair
P0480 on GMC by model: symptoms, diagnosis and fix
The electronically controlled fan clutch fails, causing overheating in traffic or at low speeds. The Envoy uses a clutch-type fan rather than electric fans, and the electronic control module in the clutch is the weak point.
Common Symptoms
- Overheating in traffic
- Temperature gauge climbs at idle
- Fan runs at full speed constantly
- A/C performance poor at idle
How to Fix
Replace fan clutch assembly (Hayden 3262). Some owners upgrade to a dual electric fan conversion for more reliable cooling. Ensure coolant system is flushed and thermostat is functioning properly.
Sources for this issue (1)
P0480 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 P0480 mean on a GMC?
P0480 stands for "Cooling Fan 1 Control Circuit." P0480 indicates a fault in the engine control module's circuit that operates cooling fan 1 (or the fan relay it drives). The computer detected an open, short, or out-of-range condition in the fan control output. Because the cooling fan helps prevent the engine from overheating — especially at idle, low speeds, or with the A/C on — a fan that won't run can lead to high coolant temperatures. It is worth addressing fairly promptly to avoid overheating, particularly in hot weather or stop-and-go traffic. On GMC it is documented across 1 model: Envoy.
What are the most common causes of P0480?
The most common causes of P0480 are: Faulty cooling fan relay, Failed cooling fan motor, Wiring damage, shorts, or corroded connectors in the fan circuit, Blown fuse or fusible link for the fan, Poor ground for the fan motor or relay, Faulty fan control module (where used), PCM driver circuit fault (less common). The specific cause varies by vehicle.
How much does it cost to fix P0480 on a GMC?
Published repair estimates on GMC range from $200 to $500 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 P0480 on a different make?
View P0480 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.