P0495
Fan 1 Overspeed
Engine cooling
Generic OBD-II
High
What it means
P0495 means the ECM detects the number-1 cooling fan spinning faster than it was commanded, or a fan-speed feedback signal that reads too high. It's a fan-control fault rather than an overheating problem — the fan is running too much, not too little — but it should still be diagnosed, since it usually points to a stuck relay, a shorted circuit, or a failing fan control module.
High
Can I keep driving? Drivable — the car runs, but a fan running too fast points to a control fault worth checking; a constantly loud fan can also load the charging system.
Common symptoms
What you'll notice
- Check-engine light on
- Cooling fan runs at high speed constantly or at the wrong times
- Excessive fan noise
- Fan doesn't slow down when the engine is cool
Common causes
Most likely first
- Faulty cooling-fan control module or driverLikely
- Fan relay stuck closed / commanding full speedCommon
- Short in the fan control or feedback wiringCommon
- Faulty fan speed feedback signalLess often
- ECM fault (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm whether the fan is actually spinning faster than commanded or the ECM is only reading an implausible feedback signal.
- Inspect the fan control module, relay, and wiring for shorts, corrosion, or a stuck relay.
- Check the fan speed feedback circuit against specification with a scan tool.
- Replace the fan control module or fan assembly if it won't respond to commanded speed. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0495?+
Usually yes. An overspeeding fan still cools the engine, but it signals a control-circuit fault and can run the battery down over time, so have it checked soon.
Can I just clear P0495?+
It returns if the control module, relay, or wiring is still faulty. Diagnose the fan control circuit before clearing.
Related codes
Often seen with P0495
Read & clear P0495 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX