U055F code meaning
Invalid Data Received From Electronic Brake Booster Control Module A
What U055F means
An electronic brake booster replaces the vacuum servo: a travel sensor reads the pedal and an electric motor supplies the assist, as in Bosch's iBooster, which also lets the brake system blend in regenerative braking and back up the stability control unit. U055F is set when booster A transmits but its data, such as pedal travel, assist status or pressure request, fail the receiver's checks. No manufacturer documents U055F publicly. Ford fits such a booster (EBB) to the 2020-2021 Escape, Bronco Sport, Explorer, Corsair and Aviator; an interrupted supply to the EBB there left a network code in the ABS module and lit the ABS and stability lamps. Lost communication is U025E. Expect warning lamps and possibly reduced assist.
U055F at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U055F
- ABS, brake or stability warning lamps on
- Harder pedal or changed pedal feel
- Regenerative braking or driver assistance functions limited
Common causes of U055F
- Most likelyBooster control unit or its pedal travel sensor faulty
- PossibleSupply interrupted or weak battery during start or service work
- PossibleBooster and ABS/ESC software not matched
- Less likelyBus wiring or connector at the booster damaged
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Electronic brake booster module a
What each part of U055F means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 5F | The exact fault in that area. |
What to do next
- Note U055F 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 U055F
What does U055F mean?
U055F means "Invalid Data Received From Electronic Brake Booster Control Module A". An electronic brake booster replaces the vacuum servo: a travel sensor reads the pedal and an electric motor supplies the assist, as in Bosch's iBooster, which also lets the brake system blend in regenerative braking and back up the stability control unit. It is a generic code, so it means the same on every make.
Is it safe to drive with U055F?
Drive gently and only to a workshop. With U055F the car can go into limp mode (reduced power) to protect itself.
Will U055F fail an emissions test?
U055F 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 U055F to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U055F clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.