U0142Lost Communication With Body Control Module B
- Generic OBD-II code · Network
- How the car detects it
- U0142 reports that a second body controller, labelled B, has stopped talking. No maker explains publicly which unit carries this letter; depending on the design it may be a rear body module, a power distribution box or a comfort unit next to the main BCM (U0140) and module A (U0141). The only manufacturer document found that mentions the code is Toyota's 2014 Prius plug-in pre-delivery sheet: the short pin is pulled for shipping to save the battery, so U0142, U0155 and U0100 are expected and simply erased once it is refitted. That makes clear how easily a dormant or unpowered module produces this code. GM's U0100-U02FF logic applies: listeners expect the module's periodic availability message at 9-16 V and log its absence. Invalid data from module B is U0443. Usually no MIL.
- What you may notice
- Body functions handled by module B do not work
- Scan tool cannot reach module B
- Often only a stored code without noticeable fault
- Likely causes
- LikelyModule B without power: fuse, transport short pin or relay missing
- PossibleFlat battery or battery disconnect leaves a history code
- PossibleDamaged bus wire or loose connector to module B
- RareBody module B internally faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.