OBD
P0493
Fan Overspeed
What it means
P0493 means Fan Overspeed.
Check these first
- A fan turning faster than the PCM commands
- A fan control module stuck at full output
- A fan speed signal the PCM reads too high
- A shorted fan control wire
What to do next
- Command the fan to each speed and compare to actual
- Check the fan control module output
- Inspect the fan speed signal wire for a short
- Replace the fan control module if output stays at full
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.