U043FInvalid Data Received From Vacuum Sensor B
- Generic OBD-II code · Network
- How the car detects it
- U043F is the counterpart for vacuum sensor B, used where a second vacuum signal exists, for example a redundant booster sensor or one watching a separate reservoir. A receiver records it when B's digital vacuum value arrives invalid. Comparing with U043E narrows the search: B alone points at that sensor or its wiring branch, both together at a shared supply, the bus or a genuine vacuum shortage. No manufacturer documents U043F publicly and no thresholds are known; in GM's analogue designs a booster sensor fault shows up as a P-code such as P0557 instead. Without a trustworthy second value the receiver loses its cross-check between the two sensors, so a brake assist warning and disabled vacuum-dependent functions are the likely consequence. U013E is lost contact.
- What you may notice
- Brake assist or vacuum system warning
- Start-stop or other vacuum-dependent functions inactive
- Likely causes
- PossibleFaulty vacuum sensor B or its electronics
- PossibleDamaged wiring branch or connector to sensor B
- RareActual vacuum leak making both sensors disagree
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.