U008E code meaning
Vehicle Communication Bus G (-) Open
What U008E means
With U008E the (-) wire of Vehicle Communication Bus G is open, CAN-Low where Bus G is a CAN. U008E is not documented publicly by any maker. Seen with an oscilloscope, CAN-Low beyond the break no longer drops from about 2.5 V to the 1.5 V that Texas Instruments gives for a dominant bit, so receivers there get only the CAN-High half of the signal and less margin against noise. Termination suffers as well: TI recommends that the 120-ohm resistors sit at the line ends and not in a node, because a disconnected node takes its terminator with it, and a broken CAN-Low can cut one of them off in the same way. Transceivers do not flag the open line themselves, as NXP points out. Checking resistance between the wires from both sides of the vehicle helps locate the gap.
U008E 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 U008E
- Modules beyond the break respond only sometimes
- Code comes and goes with temperature or road shocks
Common causes of U008E
- Most likely(-) wire of Bus G broken at a flex point
- PossibleBus G connector not fully latched or a terminal backed out
- Less likelyCorroded splice interrupting the (-) wire
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Bus g wiringModule connector
What each part of U008E means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 8E | The exact fault in that area. |
What to do next
- Note U008E 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 U008E
What does U008E mean?
U008E means "Vehicle Communication Bus G (-) Open". With U008E the (-) wire of Vehicle Communication Bus G is open, CAN-Low where Bus G is a CAN. It is a generic code, so it means the same on every make.
Is it safe to drive with U008E?
U008E does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U008E fail an emissions test?
U008E 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 U008E to fix?
Difficulty: hard. A typical repair takes 0.5 to 5 hours of work. This is a job for a workshop.
Will U008E clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.