Code result
P0493
Fan Overspeed
Moderate severity
What it means
Fan Overspeed: the control module has detected this fault condition.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Fan relay welded closed - fan runs uncontrolled
highOne of the most commonly reported causes for this code — check this first.
PWM line shorted to supply
mediumA plausible cause — test and verify before replacing parts.
Tachometer feedback miscalibrated
lowLess common, but worth ruling out after the more likely causes.
Related help
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