U013ELost Communication With Vacuum Sensor B
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- U013E concerns vacuum sensor B, the second networked vacuum sensor in vehicles that measure at more than one point, for example in the booster chamber and in a separate reservoir, or that read a redundant value. The receiving module, typically the engine or brake controller, sets the code when the frames of this sensor stop arriving. No manufacturer has published a description of U013E, and public sources do not reveal which vehicles carry two bus vacuum sensors. For orientation: GM's ECM tables cover the analog booster pressure sensor with P0556 to P0558, and CARB requires lost communication from a digital input to get its own code. U013D is sensor A, U043F invalid data from sensor B. Similar effects to U013D are likely.
- What you may notice
- Brake system or brake assist warning
- Often stored together with U013D when both sensors share wiring
- Likely causes
- LikelyLoose or corroded connector at vacuum sensor B
- PossibleSupply, ground or bus wiring shared with sensor A faulty
- RareVacuum sensor B internally faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.