U025FLost Communication With Electronic Brake Booster Control Module B
- Generic OBD-II code · Network
- Can trigger limp mode
- How the car detects it
- U025F concerns a second electronic brake booster control unit, B. No manufacturer documents this code publicly, and none states which physical unit would carry the letter. Bosch describes where two units make sense: in automated vehicles its integrated power brake, which merges boosting and stability control in one unit, is backed by a separate redundant brake unit, and the iBooster together with ESP supplies the redundancy such cars require. Ford's booster (Escape, Explorer, Bronco Sport, Aviator and Corsair of 2020-2021) shows that a power interruption at that unit lights the ABS and stability lamps through a code in the ABS module (SSM 51374). If unit B goes silent, expect brake or driver-assist warnings and the loss of the backup path, which can switch off automated driving. Unit A is U025E.
- What you may notice
- Brake system or driver-assist warning in the cluster
- Automated or assisted driving functions unavailable
- Likely causes
- LikelySecond brake unit without power or ground (separate fuse or supply path)
- PossibleDamaged bus wiring or connector to the redundant unit
- PossibleInternal failure of brake unit B
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.