U007E code meaning
Control Module Communication Bus L Off
What U007E means
There is no public manufacturer documentation for U007E; the letter L is reserved for vehicles with a dozen or more networks. The code marks the last step of the CAN error ladder. A node stays error active while its counters are below 128 and signals faults with dominant flags; between 128 and 255 it becomes error passive and may flag errors only recessively; once transmit errors exceed 255 it goes bus off and stops sending, as Wikipedia's CAN bus article describes. U007E therefore means that a module has failed repeatedly, not once. What the driver notices depends on what the silent module controls, from a missing comfort function to warning lamps, and partner modules then store their own lost-communication codes.
U007E at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U007E
- Single comfort or assistance function missing
- Partner modules report lost communication
Common causes of U007E
- PossiblePersistent short or bad contact on Bus L
- PossibleFault inside the reporting module's CAN interface
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Bus l wiringCAN transceiver
What each part of U007E means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7E | The exact fault in that area. |
What to do next
- Note U007E 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 U007E
What does U007E mean?
U007E means "Control Module Communication Bus L Off". There is no public manufacturer documentation for U007E; the letter L is reserved for vehicles with a dozen or more networks. It is a generic code, so it means the same on every make.
Is it safe to drive with U007E?
U007E does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U007E fail an emissions test?
U007E 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 U007E to fix?
Difficulty: hard. A typical repair takes 0.5 to 5 hours of work. This is a job for a workshop.
Will U007E clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.