Error code

OBD2 P0528

OBD2P0528
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Fan Speed Sensor Circuit No Signal.

Severity

moderateYou can continue driving, but overheating could cause engine damage if the fan is not functioning properly.

Summary

P0528 indicates that there is no signal from the fan speed sensor circuit in the engine's cooling system, which helps monitor and control the operation of the electric or belt-driven radiator fans.

Symptoms

  • Check Engine Light (CEL) illuminated
  • Engine overheating below 35 mph or with air conditioning on
  • Fan running continuously at full speed
  • Poor air conditioning performance

Common Causes

  • Failed fan speed sensor
  • Wiring damage due to fan abrasion
  • Faulty fan motor relay or module
  • Engine coolant temperature (ECT) sensor malfunction
  • Slipping or broken drive belt for clutch-driven fans

Diagnosis

  1. Check fuses and relays for electric fans
  2. Inspect belt-driven fan clutch for play or wear
  3. Test fan speed sensor signal with a graphing meter or multimeter

Fixes

  • Replace the faulty fan speed sensor, relay, or motor

FAQ

What should I do if my car's engine is overheating?

If your car's engine is overheating, it's important to address the issue immediately. Turn off the air conditioning and maintain a steady speed below 35 mph until you can have the vehicle checked by a mechanic.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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