Faulty cooling fan relay 2. Faulty cooling fan 2 motor. Faulty cooling fan control module, on vehicles that have one (listed by RepairPal). Open or shorted fan or relay wiring, or poor electrical connections. Faulty coolant temperature sensor. Intake air temperature sensor, A/C selector switch, A/C refrigerant pressure sensor or vehicle speed sensor faults (listed by OBD-Codes.com). Faulty PCM or a poor connection to it (less likely).

Replace the cooling fan relay. Replace a blown fuse (and find out why it blew). Repair damaged fan or relay wiring or connectors. Replace the cooling fan motor or radiator fan assembly (the common repair RepairPal lists). Replace a faulty fan control module, where fitted. Replace a faulty coolant temperature sensor. PCM repair or replacement only after everything else checks out.

P0481🔧 Engine cooling / electric cooling fanStop and fix promptly

P0481: Cooling Fan 2 Control Circuit (Meaning, Causes, Fixes)

Q: What does P0481 mean?

P0481 means the engine computer could not control the second cooling fan circuit (fan 2, or the second fan speed relay) the way it commanded. The fan may not run when it should, or, per RepairPal, it may stay on all the time. Common causes are a bad cooling fan relay, a failed fan motor or fan control module, damaged wiring and connectors, or a coolant temperature sensor problem. The two sources list somewhat different causes. Most modern cars use electric cooling fans. RepairPal explains they add cooling on hot days, with the A/C on, or in stop-and-go traffic when not enough air passes through the radiator. OBD-Codes.com says the PCM (engine computer) watches engine temperature through the coolant temperature sensor and, at roughly 223 degrees F (the exact value depends on the vehicle), switches the fan on by grounding the cooling fan relay. P0481 sets when the PCM commands the fan but the command and the result do not match. OBD-Codes.com calls it 'Cooling Fan Relay 2 Control Circuit' and says P0480 and P0482 are the same fault on the other fan speed relays; on cars with multi-speed fans there can be up to three relays (low, medium, high), so 'fan 2' can mean a second fan or a second fan speed depending on the vehicle. RepairPal calls it 'Fan 2 Control Circuit'.

Q: Can I keep driving with P0481?

Stop and fix promptly. Get this checked soon, and keep an eye on the temperature gauge until you do. RepairPal rates P0481 'Urgent', meaning it can cause severe damage or be unsafe, because the engine may overheat if the fan does not run. OBD-Codes.com gives no rating, but says the engine temperature will rise when the vehicle stops and idles. Highway driving usually moves enough air through the radiator on its own; stop-and-go traffic, idling, hot days and A/C use are when it matters most. If the gauge climbs toward hot or you see steam, pull over safely and shut the engine off. Never open a hot radiator cap, and keep hands and tools clear of the fan, since an electric fan can start on its own even with the engine off.

Reviewed 2026-10-23 · Based on 2 cited source(s)

What P0481 means

Most modern cars use electric cooling fans. RepairPal explains they add cooling on hot days, with the A/C on, or in stop-and-go traffic when not enough air passes through the radiator. OBD-Codes.com says the PCM (engine computer) watches engine temperature through the coolant temperature sensor and, at roughly 223 degrees F (the exact value depends on the vehicle), switches the fan on by grounding the cooling fan relay. P0481 sets when the PCM commands the fan but the command and the result do not match. OBD-Codes.com calls it 'Cooling Fan Relay 2 Control Circuit' and says P0480 and P0482 are the same fault on the other fan speed relays; on cars with multi-speed fans there can be up to three relays (low, medium, high), so 'fan 2' can mean a second fan or a second fan speed depending on the vehicle. RepairPal calls it 'Fan 2 Control Circuit'.

Severity: can I keep driving?

Stop and fix promptly

Get this checked soon, and keep an eye on the temperature gauge until you do. RepairPal rates P0481 'Urgent', meaning it can cause severe damage or be unsafe, because the engine may overheat if the fan does not run. OBD-Codes.com gives no rating, but says the engine temperature will rise when the vehicle stops and idles. Highway driving usually moves enough air through the radiator on its own; stop-and-go traffic, idling, hot days and A/C use are when it matters most. If the gauge climbs toward hot or you see steam, pull over safely and shut the engine off. Never open a hot radiator cap, and keep hands and tools clear of the fan, since an electric fan can start on its own even with the engine off.

Common symptoms

Check engine light on
Engine temperature rises when stopped or idling, or the engine overheats
Cooling fans may stay on all the time (listed by RepairPal)
A/C may not work properly (listed by RepairPal)

Likely causes

Roughly most to least common, based on the sources below. Your vehicle may differ.

Faulty cooling fan relay 2
Faulty cooling fan 2 motor
Faulty cooling fan control module, on vehicles that have one (listed by RepairPal)
Open or shorted fan or relay wiring, or poor electrical connections
Faulty coolant temperature sensor
Intake air temperature sensor, A/C selector switch, A/C refrigerant pressure sensor or vehicle speed sensor faults (listed by OBD-Codes.com)
Faulty PCM or a poor connection to it (less likely)

Diagnostic steps you can do

⚠ Before you start

Work on a cool engine, parked on level ground with the parking brake set. Never work under a car supported only by a jack.

Write down the freeze frame data and any other stored codes before clearing anything.
With the engine cool, check the coolant level and look for leaks, so a basic cooling problem is not mistaken for a fan fault.
With the engine and key off, look for anything blocking the radiator and spin each fan blade by hand. OBD-Codes.com says if it will not spin freely, the fan motor bearings are bad.
Unplug the fan connector and look for corrosion or bent pins. Clean or repair it and use dielectric grease on the terminals.
Check the cooling fan fuses and relays in the under-hood fuse box (the lid or owner's manual shows which is which). Swapping in an identical known-good relay is a simple test.
Many cars have two fans, one mainly in front of the A/C condenser, and some have multi-speed fans with several relays. Check your vehicle's wiring diagram to see which fan or speed 'fan 2' is. With the engine idling in Park, watch whether the fans come on as the temperature rises and when the A/C is turned on; stop the test if the gauge gets near hot.

Typical fixes

Replace the cooling fan relay
Replace a blown fuse (and find out why it blew)
Repair damaged fan or relay wiring or connectors
Replace the cooling fan motor or radiator fan assembly (the common repair RepairPal lists)
Replace a faulty fan control module, where fitted
Replace a faulty coolant temperature sensor
PCM repair or replacement only after everything else checks out

Repair costs vary widely by vehicle, region, parts brand and shop, so we don't quote prices. Get a written estimate after diagnosis.

🛠 When to call a pro

The engine is overheating or the temperature gauge reads high
The fans run all the time, even with the engine cold
The fan, fuse and relay look fine and the code comes back
Testing needs a test light, a multimeter and jumper wires. OBD-Codes.com describes jumper and ohmmeter tests of the relay, fan and harness, and checking the coolant temperature sensor's resistance cold and hot.
OBD-Codes.com warns not to disconnect the PCM without consulting the service manual, since some cars can lose programming and may not start

Where to buy

Plain search links. Always match parts to your exact year, make, model and engine.

OBD2 scanners on Amazon Parts at Advance Auto Parts catalog at RockAuto

FAQs

Can I drive with P0481?

Carefully, and watch the temperature gauge. RepairPal rates it 'Urgent' because the engine may overheat. Highway driving is usually less risky than idling or stop-and-go traffic; pull over and shut the engine off if the gauge reads hot.

What's the difference between P0480, P0481 and P0482?

They are the same type of fault on different fan circuits. RepairPal lists them as Fan 1, Fan 2 and Fan 3 Control Circuit; OBD-Codes.com says they relate to the different fan speed relays.

Why are my cooling fans running all the time?

RepairPal lists fans that stay on all the time as a P0481 symptom, along with the A/C not working. A stuck relay or a fan control fault can cause it; have the fan circuit checked, and watch for a drained battery if the fans keep running with the engine off.

Why do the sources list different causes?

OBD-Codes.com includes sensors and switches that feed the fan decision (intake air temperature, A/C switch and pressure sensor, vehicle speed sensor), while RepairPal adds the cooling fan control module used on some vehicles. Which applies depends on how your vehicle controls its fans.

Sources

Last reviewed 2026-10-23. Code definitions and repair steps can vary by manufacturer. Confirm with your vehicle's service information.