What does code P0493 mean?

Q: What does code P0493 mean?

Fan Overspeed. P0493 means the engine control module (ECM) has detected that the cooling fan is spinning faster than the commanded or expected speed for the current operating conditions. The ECM monitors fan speed through a feedback signal and sets this code when the measured speed exceeds the calibrated threshold, indicating a fan control or feedback circuit fault.

DTC codes / P04xx · Auxiliary emission controls / P0493

P0493Fan Overspeed

P0493 means the engine control module (ECM) has detected that the cooling fan is spinning faster than the commanded or expected speed for the current operating conditions. The ECM monitors fan speed through a feedback signal and sets this code when the measured speed exceeds the calibrated threshold, indicating a fan control or feedback circuit fault.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.