U0082 code meaning
Vehicle Communication Bus F (+) Open
What U0082 means
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.
U0082 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0082
- Modules on the far side of the break no longer respond
- Warnings that come and go with vehicle movement
Common causes of U0082
- Most 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
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Bus f wiringModule connector
What each part of U0082 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 82 | The exact fault in that area. |
What to do next
- Note U0082 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0082
What does U0082 mean?
U0082 means "Vehicle Communication Bus F (+) Open". U0082 reports an interrupted (+) wire on Vehicle Communication Bus F. It is a generic code, so it means the same on every make.
Is it safe to drive with U0082?
Drive gently and only to a workshop. With U0082 the car can go into limp mode (reduced power) to protect itself.
Will U0082 fail an emissions test?
U0082 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U0082 to fix?
Difficulty: hard. A typical repair takes 0.5 to 5 hours of work. This is a job for a workshop.
Will U0082 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.