P0527 Buick Fan Speed Sensor Circuit Range / Performance

P0528 Buick Fan Speed Sensor Circuit No Signal

Possible causes
– Faulty Fan Speed Sensor
– Fan Speed Sensor harness is open or shorted
– Fan Speed Sensor circuit poor electrical connection
– Faulty fan clutch
– Faulty PCM
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– Engine overheating
P0528 Buick Description

The PCM has detected an incorrect input from the Fan Speed Sensor (FSS)

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