P0480: Cooling fan 1 control circuit malfunction
The engine computer has found a fault in the control circuit of an electric cooling fan, so the fan may not run when it’s needed, or may run all the time.
Updated
What P0480 means
At speed, the air rushing through the radiator cools the engine. In slow traffic and at a standstill there is little airflow, so an electric fan pulls air through the radiator. The engine computer switches it, through a relay or a fan control module, depending on the coolant temperature and, on many cars, the air conditioning.
P0480 means the engine computer has found a fault in the control circuit of fan 1, for example an open circuit or a short. It can no longer be sure the fan runs when the engine needs it.
P0481 and P0482: fan 2 and fan 3
Cars with more than one fan, or with fan speeds that are switched separately, use P0481 for fan 2 and P0482 for fan 3. What “fan 2” is varies: on some cars a second fan, on others a higher speed of the same fan. The risk and the checks are the same.
P0481: Fan 2 Control Circuit
P0482: Fan 3 Control Circuit
Can I keep driving?
Drive gently
Drive gently and have it checked soon. The cooling fan may not run, so the engine can overheat in slow traffic, at a standstill or with the air conditioning on. Watch the temperature gauge: if it rises above normal or a temperature warning comes on, stop when it’s safe to do so and switch the engine off.
General guidance based on the code alone, not on the car’s actual condition. If in doubt, stop and ask a mechanic.
Keep an eye on the temperature gauge, especially in traffic jams, in town and with the air conditioning on. At speed the engine often stays cool, because the airflow alone is enough.
If the engine does overheat, stop when it’s safe to do so and switch the engine off: overheating can seriously damage it.
Symptoms
- The temperature gauge rises in traffic or at a standstill, and drops again once you drive faster.
- The fan doesn’t run when the engine is hot, or runs all the time with the ignition on.
- The air conditioning blows less cold air while the car is stationary.
Common causes
- Faulty fan relay or fan control module. A relay with burnt contacts, or a failed fan speed module, is a common fault and cheaper to replace than the fan.
- Faulty fan motor. A worn or seized motor doesn’t run even when it gets power.
- Blown fuse, or a wiring or connector fault. Check the fan fuses first. The connector at the fan sits behind the grille, exposed to water and dirt.
Typical fixes
- Keep hands and loose clothing away from the fan: on many cars it can start by itself, even with the engine off.
- Check the fan fuses, and the relay or fan control module.
- Let the engine reach its running temperature, or switch on the air conditioning, and check whether the fan runs. A garage can also switch it on with a tool for your make; Read My Car can’t.
- Have the power and earth at the fan checked, and replace the motor if it gets power but doesn’t run.
- On the next drive in traffic, watch the coolant temperature in Read My Car’s live data.
Questions
Can I drive with P0480?
Gently, and have it checked soon. The engine can overheat in slow traffic, at a standstill or with the air conditioning on. Watch the temperature gauge: if it rises above normal or a temperature warning comes on, stop when it’s safe to do so and switch the engine off.
Why does my car only overheat in traffic?
At speed, the airflow through the radiator is enough to cool the engine. In traffic and at a standstill the engine relies on the electric fan, so a fan fault shows up there first.
Does P0480 mean the fan motor is broken?
Not necessarily. The code is about the fan’s control circuit: a fuse, a relay, a fan control module or a connector are just as likely. Check those before replacing the fan.