U0067 code meaning
Vehicle Communication Bus E (+) Low
What U0067 means
U0067 tells of the (+) conductor of Vehicle Communication Bus E being grounded. For a Bus E built as a high-speed CAN that is CAN-High, which a dominant bit needs to raise by about a volt; grounded, it cannot. onsemi describes the resulting cycle: the controller attempts a start-of-frame, fails, flags errors, becomes error passive and finally bus-off, then must wait for 128 groups of eleven recessive bits before it may try again, so its transmit line is active only about 2 % of the time. Every Bus E node goes silent, and modules on other networks log them as missing. NXP's fault-tolerant TJA1055 low-speed chip, by contrast, carries on despite the same short. No manufacturer documents U0067 publicly. CAN-High at a few ohms to ground with the battery off confirms it.
U0067 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0067
- All functions on Bus E fail together (high-speed type)
- Missing-message codes in modules on other networks
Common causes of U0067
- Most likely(+) wire of Bus E chafed through to body ground
- PossibleHarness trapped behind the dashboard or a trim panel
- Less likelyShorted transceiver in a module on Bus E
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Bus e wiringCAN transceiver
What each part of U0067 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 67 | The exact fault in that area. |
What to do next
- Note U0067 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 U0067
What does U0067 mean?
U0067 means "Vehicle Communication Bus E (+) Low". U0067 tells of the (+) conductor of Vehicle Communication Bus E being grounded. It is a generic code, so it means the same on every make.
Is it safe to drive with U0067?
Drive gently and only to a workshop. With U0067 the car can go into limp mode (reduced power) to protect itself.
Will U0067 fail an emissions test?
U0067 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 U0067 to fix?
Difficulty: hard. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will U0067 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.