OBD-II Code P0480: Cooling Fan 1 Control Circuit Malfunction

What Does P0480 Mean?

The trouble code P0480 means your car's Powertrain Control Module (PCM) detected a problem in the primary engine cooling fan (Fan 1) electrical circuit. The computer commanded the fan to turn on or off but did not receive the correct electrical voltage response, meaning the fan is inoperative.

Technical definition: The SAE/OBD-II definition is "Cooling Fan 1 Control Circuit Malfunction." The Powertrain Control Module (PCM) monitors the fan control circuit and expects a specific voltage feedback when activated. A voltage reading that is too high, too low, or absent triggers the code.

Can I Drive With P0480?

No — Do Not Drive. Do not drive. A non-functioning cooling fan causes the engine to overheat in minutes during slow traffic or hot weather, leading to catastrophic damage like a warped cylinder head ($800-$1,500) or a blown head gasket ($1,000-$2,500+). If you must move the vehicle, drive only short distances above 30 mph where natural airflow cools the radiator, and turn the heater on full blast to pull heat from the engine. Towing is the safest option.

Common Causes

• Faulty Cooling Fan Relay (Very Common) — The relay is a small electromagnetic switch that controls high current for the fan motor. This is the most frequent point of failure, as internal contacts burn out or get stuck.
• Blown Fuse (Common) — A high-amperage fuse protects the fan circuit. A blown fuse is a symptom of a deeper problem, such as a seizing fan motor drawing too much current or a short circuit in the wiring.
• Failed Cooling Fan Motor (Common) — The electric motor that spins the fan fails from worn bearings, burned internal windings, or an internal short. This is the culprit if you hear grinding noises or the fan is seized and hard to spin by hand.
• Damaged Wiring or Connectors (Common) — Due to high heat and vibration, wires leading to the fan assembly fray, melt, or break. Connectors also fill with corrosion, interrupting the electrical signal.
• Faulty Fan Control Module (Less Common) — Many modern vehicles use a separate module to control fan speed via a pulse-width modulated (PWM) signal. This module fails, preventing it from activating or regulating the fan.
• Defective Coolant Temperature Sensor (ECT) (Less Common) — The PCM uses the ECT sensor to know when the engine is hot. If the sensor provides false data (e.g., reporting the engine is cold when it's hot), the PCM does not command the fan to turn on. This is usually accompanied by codes P0117 or P0118.
• Problem with the Totally Integrated Power Module (TIPM) (Rare) — On many Chrysler, Dodge, and Jeep products, the fan relay is integrated into the TIPM (main fuse box). An internal failure here causes P0480 and requires specialized repair or replacement of the entire unit.
• Faulty Powertrain Control Module (PCM) (Very Rare) — The PCM itself fails if an internal driver cannot send the activation signal. Consider this only after exhaustively ruling out all other possibilities.

Symptoms

• Cooling Fan Does Not Turn On (or Stays On) — The primary cooling fan does not run when the engine is hot or the A/C is on. Conversely, a shorted relay causes the fan to run constantly, even with the engine off, draining the battery.
• Air Conditioning Performance is Weak or Inoperative — The A/C system requires the cooling fan to pull air over the condenser. Without the fan, the A/C blows warm air, especially when the vehicle is stationary.
• Engine Overheating at Low Speeds or Idle (also visible on scanner) — The temperature gauge climbs towards 'H' when stopped in traffic, idling, or moving at low speeds, as there is no natural airflow through the radiator.
• Check Engine Light is On (also visible on scanner) — The PCM illuminates the Check Engine Light on the dashboard as soon as it detects the fault in the fan circuit.
• Reduced Fuel Economy (also visible on scanner) — An engine running hotter than its optimal temperature experiences a noticeable drop in fuel efficiency, sometimes by as much as 8-12%.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this code.

Common Fixes & Costs

• Replace Cooling Fan Relay — Parts: $15-$50, Labor: $0-$75, ~0.2 hr book time (DIY)
• Replace Blown Fuse — Parts: $1-$10, Labor: $0, ~0.1 hr book time (DIY)
• Replace Cooling Fan Assembly — Parts: $150-$600, Labor: $250-$400, ~2.2 hr book time (Intermediate)
• Replace Fan Control Module — Parts: $75-$300, Labor: $75-$150, ~1 hr book time (Intermediate)
• Repair Wiring or Connector — Parts: $10-$50, Labor: $125-$250, ~1.5 hr book time (Professional)

Used vs. New Parts: Buying Guide

When a used part is worth it: For a complete cooling fan assembly on an older vehicle (>150k miles) where budget is the primary concern. A used OEM assembly from a low-mileage donor car offers good value.

Donor-vehicle mileage cap: roughly under 80000 miles for the part to have meaningful remaining life.

Donor quality checklist:

• Verify the donor vehicle was not scrapped for overheating or engine failure.
• Inspect the fan blades for cracks and ensure the motor spins freely by hand.
• Match the part number exactly, as different model years or trim levels have incompatible connectors or modules.

Decision logic:

• If The failed part is a relay or fuse → Always buy new; the cost is minimal.
• If The failed part is the electronic Fan Control Module → Favor a new OEM or high-quality aftermarket part. Used electronics carry a high risk of failure.
• If The vehicle is less than 8 years old and the budget allows → Buy a new OEM or top-tier aftermarket fan assembly for maximum reliability.
• If The vehicle is older and budget is tight → A used OEM fan assembly from a reputable salvage yard is a reasonable choice, but carries the risk of a shorter lifespan.

Warranty tradeoff: Used parts typically have a 30-90 day warranty at best, covering the part only. New aftermarket parts offer a 1-year to limited lifetime warranty. New OEM parts carry a 1-2 year warranty.

Worst-case if a used part fails: $300-$600 if a used fan assembly fails after installation, requiring repeat labor costs plus the price of another replacement part.

What Happens If You Wait — Timeline

1. 0-1 week: Check Engine Light is on. Fan is inoperative. Engine temperature is normal during highway driving but spikes in traffic. A/C performance is poor at idle. (MPG impact: 0-2%% · Added cost: $0-$250 (if towing is needed after an overheating event))
2. 1-4 weeks: Driver experiences significant overheating (temp gauge in red, steam from hood). Repeated thermal stress weakens cooling system hoses and plastic components. (MPG impact: 2-5%% · Added cost: $250 (Towing) + $100-$300 (Potential for damaged coolant hoses or reservoir tank))
3. 1-3 months: Severe overheating warps the cylinder head and blows the head gasket. Coolant mixes with oil, or exhaust enters the cooling system. (MPG impact: 5-15%% · Added cost: $1,500-$3,000 (Head gasket and potential cylinder head resurfacing costs))
4. 3+ months: Catastrophic engine damage. Prolonged overheating cracks the cylinder head or block, or pistons seize. The engine requires replacement. (MPG impact: 15-25%+% · Added cost: $4,000-$8,000+ (Cost of a used or remanufactured engine replacement))

Cost of Not Fixing It

• Immediate (First Drive): Engine overheating in traffic, leading to being stranded. Poor A/C performance. Coolant boiling or loss. (Added cost: $150-$250 (Towing))
• 1-3 Months: A significant overheating event blows the head gasket, requiring extensive engine disassembly to repair. (Added cost: $1,000-$2,500+)
• 3+ Months: Repeated overheating warps or cracks the cylinder head, or causes complete engine seizure. The engine requires replacement. (Added cost: $3,000-$8,000+ (Used or remanufactured engine replacement))

Diagnosis Steps

1. Scan for Codes and Review Freeze Frame Data
   Use an OBD-II scanner to confirm P0480 and check for related codes (e.g., P0481, P0117). Note the freeze frame data, which shows engine conditions (coolant temperature, vehicle speed) at the exact moment the code set.
   Tools: OBD-II Scan Tool (Beginner)
2. Check Fuses and Swap the Fan Relay
   Locate the fuse box and inspect the high-amperage cooling fan fuse. Next, swap the fan relay with an identical relay from a non-critical system (like the horn). If the fan works after the swap, the original relay is dead.
   Tools: Owner's Manual, Fuse Puller (Beginner)
3. Visual Inspection of Fan and Wiring
   With the engine off and cool, visually inspect the fan for obstructions. Spin the blades by hand; they must move freely without grinding. Inspect the wiring harness and relay for melting, corrosion, or broken wires.
   Tools: Flashlight (Beginner)
4. Test the Fan Motor Directly
   Disconnect the fan's electrical connector. Using fused jumper wires, apply 12V power directly from the battery to the fan motor terminals. If the fan spins, the motor is good. If it does not spin, the motor has failed.
   Tools: Fused Jumper Wires, Battery Source (Intermediate)
5. Test Relay Socket Voltages
   Remove the fan relay. Use a multimeter to test the socket terminals. You need: one constant 12V+ terminal, one switched 12V+ terminal (ignition ON), one load terminal (to the fan), and one ground signal terminal (from the PCM). This isolates where power is dropping.
   Tools: Multimeter (Advanced)
6. Verify the PCM Command Signal
   Use a bidirectional scan tool's active test function to command the fan ON and OFF. If the scanner sends the command but the fan doesn't run (and the motor/relay are good), the wiring between the PCM and relay is faulty.
   Tools: Bidirectional Scan Tool (Advanced)
7. Inspect the Ground Connection
   Locate the cooling fan circuit ground wire, typically bolted to the chassis near the radiator. A loose or rusty ground prevents the circuit from completing. Remove the bolt, clean surfaces to bare metal, and re-secure.
   Tools: Socket Set, Wire Brush (Intermediate)
8. Test Fan Motor Current Draw
   Command the fan on with a bidirectional scanner while using a clamp-on ammeter around the fan's power wire. A healthy motor draws 15-25 amps. A higher draw indicates a binding motor (which blows fuses); zero draw means an open circuit.
   Tools: Clamp-on Ammeter, Bidirectional Scan Tool (Advanced)
9. Test ECT Sensor Resistance
   Disconnect the Engine Coolant Temperature (ECT) sensor. Measure resistance across the terminals with a multimeter set to Ohms. Compare to the service manual (typically ~2,500 Ω at 68°F and ~300 Ω at 176°F). Out-of-spec readings indicate a faulty sensor.
   Tools: Multimeter, Service Manual (Advanced)
10. Test Fan Motor Winding Resistance
    With the fan motor disconnected, measure resistance between its power and ground terminals using a multimeter. A healthy motor reads 0.2 to 5.0 Ohms. Infinite resistance means an internal open circuit; zero resistance means a direct short. Both require replacement.
    Tools: Multimeter (Advanced)

When This Code Triggers (Freeze-Frame Conditions)

• Engine Coolant Temp: 220-235°F (104-113°C) (The PCM commanded the fan on, but detected a circuit fault.)
• Vehicle Speed: 0-15 mph (Vehicle is at idle or in stop-and-go traffic, where fan operation is critical.)
• RPM: 650-1200 (Engine is at or just above idle speed.)
• A/C System Status: On (The A/C was activated, which should have triggered the fan, but a fault was detected.)

Related Codes

• P0481 — Indicates a malfunction in the Cooling Fan 2 control circuit. P0480 points to the primary/low-speed circuit, and P0481 to the secondary/high-speed circuit. Diagnosis is identical.
• P0482 — Points to a malfunction in the Cooling Fan 3 control circuit. Found on heavy-duty vehicles or complex cooling systems. Diagnostic principles are identical.
• P0483 — Means the PCM detects a mismatch between the fan's commanded state and actual performance. P0480 is a circuit fault; P0483 means the circuit is valid but the fan isn't cooling the engine.
• P0117 / P0118 — The PCM relies on the ECT sensor to activate the fan. Erroneous signals (e.g., -40°F) prevent the PCM from commanding the fan on. Fixing the ECT sensor resolves the P0480.

Climate & Environmental Factors

• High Temperatures / Hot Climates: Components in the cooling fan circuit endure greater stress and longer run times. This increased demand accelerates wear, leading to a higher likelihood of failure.
• High Humidity / Road Salt: Moisture and salt accelerate corrosion on electrical connectors and ground points. This increases resistance, causing voltage drops, heat buildup, and eventual failure.
• Altitude: Less dense air reduces air cooling effectiveness, forcing the fan to run more frequently and for longer periods. This increased usage accelerates wear on the motor and relay.

How to Talk to a Mechanic About This Code

Say this: "I have a P0480 code and my engine overheats at idle. My cooling fan isn't running. Please test the fan relay, fuse, and wiring before quoting a full fan assembly replacement."

This signals you understand the common, inexpensive failure points. It directs the technician to perform a systematic diagnosis, preventing an immediate quote for the most expensive repair.

Avoid saying:

• 'My check engine light is on, can you look at it?'
• 'My car is overheating, just fix it.'
• 'I think I need a new radiator fan.'

Questions to ask before authorizing the repair:

• What was the specific point of failure? Was it the relay, the motor, the wiring, or the control module?
• Did you test the fan motor by applying 12-volt power directly to it?
• If the relay was the issue, did you confirm it by swapping it with a known-good relay?
• If you are recommending a full fan assembly, can you explain why the individual motor or module can't be replaced?
• What is the warranty on the recommended parts and labor?

Where to Take It: Dealer vs Independent vs Chain

• Dealer: Recommended for in-warranty vehicles or confirmed TIPM-related faults on Chrysler/Dodge/Jeep models. Otherwise, a more expensive option.
  Best for: Vehicles under warranty., Known manufacturer-specific issues like the Chrysler/Dodge TIPM failures., Complex electrical issues where factory diagnostic tools and wiring diagrams are essential.
  Downsides: Significantly higher labor rates and parts costs., May be more inclined to replace an entire assembly rather than repair a specific wire or connection. (Typical cost: +50% vs. baseline)
• Independent Shop: Best fit for most out-of-warranty vehicles. A good independent shop handles a P0480 diagnosis and repair efficiently and cost-effectively.
  Best for: Out-of-warranty vehicles where cost is a factor., Diagnosing and repairing common electrical faults like relays, motors, and wiring., Building a relationship with a trusted mechanic.
  Downsides: Quality and expertise vary widely; vetting through reviews and certifications (like ASE) is crucial., May lack access to the most advanced, manufacturer-specific diagnostic software for very new or complex models. (Typical cost: +0% vs. baseline)
• Chain Shop: Avoid for initial diagnosis. The risk of misdiagnosis or being sold unnecessary parts (like a whole fan assembly for a bad relay) is high.
  Best for: Simple, pre-diagnosed repairs like replacing an accessible relay you've already identified as faulty.
  Downsides: Technician skill varies dramatically., Often high pressure to upsell services and parts., Generally not recommended for electrical diagnostic work, which requires more specialized expertise than routine maintenance. (Typical cost: -10% vs. baseline)

When to Walk Away From the Repair

If the estimated repair cost exceeds 50% of your car's private-party value, seriously consider selling or trading it in.

• Car worth $4000, fix is $800: Fix it. This repair is well below the 50% threshold and is critical for the car's operation.
• Car worth $3000, fix is $1800: Walk away. The repair cost is over 50% of the car's value, and this money is better used as a down payment on a more reliable vehicle.

What Scan Tool You Need for This Code

Minimum: A basic OBD-II code reader that can read and clear codes, and preferably view live data like Engine Coolant Temperature.

A basic reader confirms the P0480 code but cannot test the circuit. Proper diagnosis requires commanding the fan on and off, which requires a bidirectional tool.

Budget: BlueDriver Pro (~$90) — Reads and clears the code, shows live data (coolant temp), and generates repair reports. It does not offer bidirectional control for fan testing.

Mid-range: Foxwell NT510 Elite (~$200) — Provides full-system diagnostics and bidirectional control (Active Tests) to command the cooling fan relay and motor on/off, pinpointing the failure.

Professional: Autel MaxiCOM MK808S (~$380) — Offers robust bidirectional control to activate fans and relays. It provides extensive live data graphing and OE-level diagnostics for deep troubleshooting.

Rent vs buy: For a one-time diagnosis, AutoZone's Loan-A-Tool program allows you to borrow a basic OBD-II scanner for free with a refundable deposit. If you need bidirectional control, you must purchase a scanner, as rental tools typically do not have this feature.

How to Clear the Code After You Fix It

1. Reconnect the battery if it was disconnected for the repair.
2. Use an OBD-II scan tool to erase the P0480 trouble code from the PCM's memory.
3. Perform a complete drive cycle to allow the vehicle's readiness monitors to run.

Drive cycle (~20 minutes): Start the engine from a cold state. Let it idle for 2-3 minutes. Drive in stop-and-go city traffic for about 10 minutes, including several stops. Drive at a steady highway speed (55-60 mph) for 5-10 minutes. Allow the engine to cool down completely. The goal is to let the engine reach full operating temperature to verify the fan activates correctly.

Readiness monitors affected: Comprehensive Component Monitor, Catalyst Monitor, Evaporative System Monitor, O2 Sensor Monitor

Before emissions retest: drive at least 50 miles to fully set monitors.

Watch out for:

• Simply disconnecting the battery clears the code, but it also resets all readiness monitors, causing an immediate emissions test failure.
• If the root cause (like a seizing motor that will soon blow the new fuse) is not fully fixed, the code returns during the first drive cycle.

Will This Fail Emissions / State Inspection?

Yes — this code typically fails an OBD-II emissions inspection.

• California: An illuminated Check Engine Light results in an automatic failure of the smog check. All OBD-II readiness monitors must also be in a 'Ready' state, so you cannot simply clear the code before the test.
• New York: The NYS inspection includes an OBD-II scan. A P0480 code is a guaranteed failure. The fault must be repaired and the code cleared, followed by a drive cycle to set the monitors before a re-test.
• Texas: In the 17 counties requiring emissions testing, an active P0480 code causes the vehicle to fail the OBD portion of the annual safety inspection.

Most Commonly Affected Vehicles

• Ford F-150 (2017-2024) — Often linked to faulty cooling fan relays or burned motor windings, particularly in 3.5L EcoBoost models which place high demand on the cooling system.
• Chevrolet Malibu (2018-2024) — Commonly caused by defective fan control modules or corroded wiring in the fan circuit, especially on 1.5L turbo models.
• Chrysler/Dodge/Jeep Town & Country/Grand Caravan/Various (2007-2016) — These vehicles are notorious for issues with the cooling fan relay, which is integrated into the TIPM (fuse box). A failure inside the TIPM is a well-documented cause.
• Volkswagen Jetta (2016-2023) — Frequently stems from blown fuses or failures in the engine coolant temperature sensor. On some models, the fault causes the fan to run continuously even when the engine is off.
• Chevrolet Silverado 1500 (2006-2013) — Issues with the cooling fan relay box and associated wiring are common causes. GM issued TSB 09-06-03-007A for Impala Police models regarding overheating fuse blocks affecting fan operation, a similar architecture to other GM products of the era.
• Honda Civic (2019-2024) — Often due to worn fan motor bearings causing the motor to seize, or loose electrical connectors at the fan assembly.
• Ford Focus (2012-2018) — The fan control module is a very common failure point on these models. It is a separate part from the fan motor and is often replaced independently.
• Nissan Altima (2013-2018) — Prone to issues with both the fan motor and the fan control relay, causing intermittent cooling and triggering the P0480 code.

Manufacturer-Specific Notes

• Chrysler/Dodge/Jeep: The fan relay is integrated into the Totally Integrated Power Module (TIPM). A failure here requires professional TIPM repair or replacement rather than a simple relay swap.
• General Motors (GM): GM issued TSB 09-06-03-007A for intermittent cooling fans with P0480 due to high temperatures in the fuse block. The fix installs a revised cooling fan relay and harness.
• Ford: The fan control module is a separate, serviceable part mounted on the fan shroud. It is a frequent failure item and must be checked before condemning the entire fan assembly.
• Volkswagen: A P0480 fault causes the cooling fan to run continuously, even with the key removed. This is due to a short circuit within the fan control module, integrated into the larger cooling fan.

Real Owner Stories

2014 Mustang V6 - The Hidden Relay Failure

The car overheated when the A/C was turned on, but not during normal driving. The cooling fan was not running when the engine got hot.

What they tried:

1. Tested the fan motor directly - it worked.
2. Tested the fuses - all were good.
3. Tested the high-speed fan relay with a multimeter, and it showed continuity, suggesting it was working correctly.

Outcome: Despite passing the multimeter test, the relay failed under actual electrical load. Swapping the fan relay with the starter relay proved the fan worked (but the car wouldn't start). A new $21 relay permanently fixed the overheating.

Lesson: A relay can test good for continuity with a multimeter but still fail under a real-world load. The quickest and most definitive test is to swap the suspect relay with an identical known-good one from a different circuit.

2010 Dodge Grand Caravan - The Notorious TIPM

Check Engine Light with code P0480 came on, and the cooling fan would not activate, causing the engine to overheat in traffic. The A/C blew warm air at idle.

What they tried:

1. Checked the cooling fan fuse, which was intact.
2. Attempted to locate the cooling fan relay to swap it, but discovered it was integrated into the Totally Integrated Power Module (TIPM) and not separately replaceable.

Outcome: After confirming the fan motor worked via direct power, the owner concluded the fault was inside the TIPM. A professional TIPM repair service resolved the P0480 code and restored fan function.

Lesson: On many Chrysler, Dodge, and Jeep vehicles, the fan relay is soldered into the main fuse box (TIPM). If you can't find a swappable relay, research your vehicle to see if it has an integrated TIPM, which requires specialized repair.

2015 Chevy Cruze 1.4L Turbo - Wiring, Not the Motor

Intermittent P0480 code. The cooling fan sometimes worked, but often failed to turn on, causing the temperature to rise. The owner suspected a failing fan motor.

What they tried:

1. Replaced the cooling fan relay, but the problem persisted.
2. Prepared to replace the entire cooling fan assembly, assuming the motor was failing.

Outcome: Before replacing the fan, the owner found the main electrical connector on the fan shroud had melted pins. Replacing the pigtail connector for $20 and applying dielectric grease solved the problem permanently.

Lesson: Always inspect wiring and connectors closely before replacing expensive components. High-current parts generate heat, which damages plastic connectors over time. A $20 pigtail repair saves you from a $400+ fan assembly replacement.

How to Prevent This Code From Triggering

• Clean Radiator and Condenser Fins Annually (Once per year) — Dirt, bugs, and road debris clog the fins, blocking airflow. This forces the fan to run longer and harder, accelerating wear on the motor and relay.
• Perform Coolant Flushes per Manufacturer's Interval (Every 3-5 years or 30,000 miles, check owner's manual) — Old coolant becomes acidic and damages the ECT sensor, leading to incorrect fan commands. A clean system cools efficiently, reducing fan runtime.
• Inspect and Clean Electrical Connectors (During other under-hood maintenance) — Connectors are exposed to moisture and salt. Disconnecting them, checking for corrosion, and applying dielectric grease prevents high resistance and voltage drops.
• Check Battery Terminals and Ground Connections (Every oil change) — Corroded battery terminals or a loose chassis ground cause low system voltage, providing insufficient power to the fan circuit and confusing the PCM.

Frequently Asked Questions

How serious is code P0480?

It is a highly serious code. If the cooling fan fails, your engine overheats rapidly in traffic. This causes catastrophic damage like a warped cylinder head or a blown head gasket, costing thousands of dollars to repair.

Will a P0480 code clear itself?

No, P0480 indicates a hard electrical or mechanical fault that requires repair. The Check Engine Light returns quickly, usually within one drive cycle, if the root cause remains unfixed.

Can a bad battery cause a P0480 code?

Yes. A failing battery or poor electrical ground causes erratic system voltage. This provides insufficient power to the high-amperage fan circuit or confuses the PCM's monitoring, triggering the code.

My fan is always on. Can this be caused by P0480?

Yes. A fan running constantly, even with the key off, points to a shorted or 'stuck closed' cooling fan relay or a failed fan control module. This drains the battery and triggers P0480 because the fan's state contradicts the PCM's command.

I replaced the fuse and it blew again. What now?

A repeatedly blowing fuse indicates a dead short to ground or an excessive electrical draw. This is almost always caused by a seizing fan motor or melted wiring. Stop replacing the fuse and test the motor's current draw to find the root cause.

What is a common misdiagnosis for P0480?

The most common mistake is replacing the entire cooling fan assembly ($400-$1,000+) when the actual cause is a $20 cooling fan relay. Always diagnose systematically, starting with the fuse and relay swap test.

Can a bad A/C pressure switch cause P0480?

Yes. Turning on the A/C is a primary trigger for the cooling fan. If the A/C pressure switch fails, the PCM does not receive the signal to activate the fan, contributing to a P0480 code under specific conditions.

What does 'Fan 1' mean if I only have one fan?

If your vehicle has a single cooling fan, 'Fan 1' refers to that unit. On multi-speed fans, 'Fan 1' typically designates the low-speed control circuit, while 'Fan 2' (P0481) designates the high-speed circuit.

Key Takeaways

• Stop driving immediately; a non-functioning fan causes rapid overheating in traffic, risking a $1,500+ blown head gasket.
• Swap the cooling fan relay with an identical one (like the horn relay) before buying parts; a faulty $20 relay is the most common cause of P0480.
• Test the fan motor directly by applying 12V power from the battery; if it spins, the motor is good and the fault lies in the control circuit.
• Turn the A/C to max to force the fan on; if the A/C blows warm at idle and the fan doesn't spin, you have a confirmed P0480 symptom.
• Check the 30A to 50A cooling fan fuse; if it blows repeatedly, you have a seized fan motor or a dead short in the wiring.