U0086: The vehicle communication bus F gives a lower signal than normal
The vehicle communication bus F gives a lower signal than normal. It is usually the part, its wiring or a connector with poor contact.
| Code | U0086 |
|---|---|
| System | Communication network |
| Group | U00xx, Communication buses |
| Type | Generic: it means the same on every make |
How to read and clear U0086 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see U0086 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- U0082 The vehicle communication bus F has a broken or disconnected wire
- U0083 The vehicle communication bus F gives a lower signal than normal
- U0084 The vehicle communication bus F gives a higher signal than normal
- U0085 The vehicle communication bus F has a broken or disconnected wire
- U0087 The vehicle communication bus F gives a higher signal than normal
- U0088 The negative line of VAN data bus F has a short circuit to its positive line
- U0089 The vehicle communication bus G is not working properly
- U008A The vehicle communication bus G gives readings outside the normal range
- U0001 High speed CAN communication bus
- U0073 Control module communication bus A off
What does code U0086 mean?
The vehicle communication bus F gives a lower signal than normal. It is usually the part, its wiring or a connector with poor contact.
How do you clear U0086?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, U0086 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
