OBD-II code · Powertrain (generic)
P0493 Fan Overspeed
Fan Overspeed: the control module has detected this fault condition.
Is it safe to drive with P0493?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyFan relay welded closed - fan runs uncontrolled
- PossiblePWM line shorted to supply
- Less likelyTachometer feedback miscalibrated
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.6–1.8 h
- Emissions test
- Usually unaffected
- Parts involved
- Cooling Fan, Fan Relay, Fan Speed Sensor
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.