P0526 means Fan Speed Sensor Circuit. The computer is not getting a valid signal from the cooling fan speed sensor, so it cannot confirm the fan is turning at the commanded speed. It is a generic OBD-II code, so the definition is the same on any make, but the most likely cause varies by engine; confirm with a scan tool and the service information for your vehicle before buying parts.
What P0526 means
The coolant temperature reading feeds many systems: warm-up fueling, ignition timing, idle speed, cooling fan control, transmission shift timing and often the dash gauge. A wrong reading causes symptoms far beyond the cooling system, and a real overheat can damage an engine quickly. Confirm the actual temperature with a scan tool or an infrared thermometer before replacing parts.
P0526 symptoms
- Check engine light
- Cooling fan running all the time or at full speed
- Possible overheating in traffic or with the air conditioning on
- Louder fan noise than usual
Common causes of P0526
- Failed fan speed sensor
- Damaged wiring or connector
- Fan motor or viscous clutch problem
- Debris or damage stopping the fan from turning freely
How to diagnose P0526
- Check whether the fan runs and at what speed
- Inspect the sensor wiring and connector
- Check the sensor signal on a scan tool
- Spin the fan by hand with the engine off and check for binding or a slipping clutch
Can you drive with P0526?
Yes, while watching the temperature gauge closely.
P0526 tips
If the fan runs flat-out all the time, the computer may be running it as a fail-safe because it cannot read the speed.
Will P0526 clear itself?
If the fault stops, the computer turns off the check engine light by itself after several drive cycles without seeing it again, and the code stays in memory as history for a while. Clearing P0526 with a scan tool after a repair is fine, but if the cause is still there the code returns, sometimes within one drive. Disconnecting the battery also clears codes on most vehicles, but it erases learned fuel trims and idle settings as well.
Related codes
| Code | Meaning |
|---|---|
| P0480 | Cooling Fan 1 Control Circuit |
| P0481 | Cooling Fan 2 Control Circuit |
| P0128 | Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) |
Guides that help
When it is more than a sensor
Most cooling codes end with a thermostat, sensor, fan or leak repair. If the engine overheated badly enough to fail the head gasket or warp the heads, compare a repair against a replacement on our engines page and read engine replacement cost.
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