P1473 Buick Fan Secondary High With Fan(s) Off

P1474 Buick Low Fan Control Primary Circuit Malfunction

Possible causes
  • FCV circuit open or shorted.
  • B+ or ground circuit fault to cooling fan.
  • VPWR open to cooling fan (if applicable).
  • Damaged cooling fan module.
  • PCM damaged.
    • Symptoms
    – Engine Light ON (or Service Engine Soon Warning Light)
    P1474 Buick Description

    This test checks the Fan Control – Variable (FCV) output circuit. The DTC sets if the PCM detects the voltage on the FCV circuit is not within the expected range.

    Buick Vehicle:Buick Regal – ?Buick Riviera – ?Buick LaCrosse – ?David Dunbar Buick – Buick Century – Buick LaCrosse – Buick LeSabre – Buick Lucerne – Buick Park Avenue – Buick Regal – Buick Verano – Buick Enclave – Buick Encore – Buick Rainier – Buick Rendezvous – Buick Terraza – Buick Riviera