P0480 on Chevrolet
Cooling Fan 1 Control Circuit
P0480 on Chevrolet vehicles indicates cooling fan 1 control circuit. Au7o has documented this code across 2 Chevrolet models — most commonly on Corvette, Sonic. 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. Typical repair costs on Chevrolet range from $75 to $450, depending on the specific model and root cause.
Common Causes of P0480
- •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)
P0480 on Chevrolet by Model
Chevrolet Corvette(1 issue)
- Cooling Fan Relay Failure and Late Fan Engagement (Overheating)1984-1996
C4 cooling fans are relay-controlled and factory-programmed to switch on at very high coolant temperatures (around 230-238°F, set for emissions compliance), so any weakness in the fan relay or coolant temperature sensor quickly tips the car into overheating in traffic. Fan relays are a recognized common failure on these cars, and on 1992-1996 LT1 models the fan circuit is also routed through the HVAC refrigerant pressure switch, so a discharged A/C system can keep the fans from running. Chronic overheating risks head gasket damage and accelerates Opti-Spark failure on LT1 cars.
Chevrolet Sonic(1 issue)
- Plastic Thermostat Housing / Coolant Outlet Cracking and Leaking2012-2020
The Sonic uses a molded plastic thermostat housing (coolant outlet) on both the 1.8L LUW/LWE and 1.4L turbo engines. Repeated thermal cycling embrittles the plastic, and the housing cracks at the seams, at the hose-neck stubs, or the integrated O-ring seal takes a set. Coolant weeps down onto the transmission bell housing and the block, so owners often mistake it for a transmission or oil leak. Because the thermostat is integral to the housing, a stuck-open thermostat frequently accompanies the leak, producing slow warm-up and poor heater output. Sonic Owners Forum members list the coolant outlet alongside the surge tank and plastic coolant elbows as a cluster of thermal-fatigue failures that show up on higher-mileage cars. This is a separate component from the water pump, which has its own well-known failure.
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View P0480 across all makes →Frequently Asked Questions
What does P0480 mean on Chevrolet?▼
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 Chevrolet specifically, this code is documented across 2 models.
What causes P0480 on Chevrolet vehicles?▼
Common causes on Chevrolet: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0480 on a Chevrolet?▼
Repair costs on Chevrolet range from $75 to $450, depending on the specific model and root cause.
Which Chevrolet models have P0480 documented?▼
Au7o has documented P0480 on 2 Chevrolet models: Corvette, Sonic.