Network, generic

U055F Invalid Data Received From Electronic Brake Booster Control Module A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Booster control unit or its pedal travel sensor faulty
Supply interrupted or weak battery during start or service work
Booster and ABS/ESC software not matched
Bus wiring or connector at the booster damaged

Symptoms

  • ABS, brake or stability warning lamps on
  • Harder pedal or changed pedal feel
  • Regenerative braking or driver assistance functions limited

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–1,800
Time0.5–3 h

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

Parts involved

electronic brake booster module a

Related codes

U025EU0560U0415U0129

References: bosch-mobility.com, static.nhtsa.gov.