U0082Vehicle Communication Bus F (+) Open
- Generic OBD-II code · Network
- Can trigger limp mode
- How the car detects it
- U0082 reports an interrupted (+) wire on Vehicle Communication Bus F. Where Bus F is FlexRay, as Audi's A6/A7 bulletin suggests, this is bus plus (BP); in a CAN it would be CAN-High. FlexRay signals by the voltage difference between BP and BM, and NXP's TJA1081B only accepts activity once that difference exceeds a threshold of about 150 to 300 mV. Nodes beyond a broken BP therefore receive a reduced or missing signal, while the sender keeps seeing its own output intact on its side of the break, so its bus error flag stays quiet. The fault shows as partners that stop answering. No manufacturer documents U0082 publicly; Volvo and Mack trucks fold line breaks on their datalink 7 CAN into U008088. Check BP continuity connector by connector.
- What you may notice
- Modules on the far side of the break no longer respond
- Warnings that come and go with vehicle movement
- Likely causes
- Likely(+) wire of Bus F broken at a flex point or after chafing
- PossibleTerminal of the (+) wire pushed back in a connector
- PossibleInline connector of Bus F not fully latched
- Repair
- Hard · Usually a job for a workshop.Typical cost: €60 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.