C0047 code meaning
Brake Booster Pressure Sensor
What C0047 means
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.
C0047 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C0047
- Lack of power brake assist
- Soft or extended pedal at start-up
- ABS or brake warning lamp on
Common causes of C0047
- Most likelyBooster pressure sensor out of range
- PossibleModule calibration or software issue
- Less likelyHarness or connector fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Brake booster pressure sensor
What each part of C0047 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 47 | The exact fault in that area. |
What to do next
- Note C0047 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about C0047
What does C0047 mean?
C0047 means "Brake Booster Pressure Sensor". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with C0047?
Drive gently and only to a workshop. With C0047 the car can go into limp mode (reduced power) to protect itself.
Will C0047 fail an emissions test?
C0047 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is C0047 to fix?
Difficulty: workshop only. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will C0047 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.