Chassis, generic

C0047 Brake Booster Pressure Sensor

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Covers the pressure sensor in the power brake booster or brake actuation unit, which measures boost or assist pressure so the module can regulate assist and detect loss of boost. The module monitors the sensor for a signal outside the valid range, an open or short and values that disagree with pedal demand or master-cylinder pressure. Ford documents C0047:64 on 2020 Explorer and Lincoln Aviator, where it is stored in the ABS module with a noticeable loss of power brake assist or a soft, long brake pedal just after start-up. A fault reduces or disables controlled assist and sets the brake or ABS warning lamp; the driver may feel a harder, longer pedal until assist is restored.

Likely causes

Booster pressure sensor out of range
Module calibration or software issue
Harness or connector fault

Symptoms

  • Lack of power brake assist
  • Soft or extended pedal at start-up
  • ABS or brake warning lamp on

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€200–2,000
Time1–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

brake booster pressure sensor

Related codes

C0048C0021C0022

References: static.nhtsa.gov, en.wikipedia.org.