U0097 code meaning
Vehicle Communication Bus H (-) Open
What U0097 means
U0097 points to an open (-) wire on Vehicle Communication Bus H, CAN-Low if Bus H is a CAN. The code is absent from public manufacturer documents. Effects vary: NXP's fault-tolerant TJA1055 keeps receiving differentially with a broken CANL, while on a high-speed CAN the nodes beyond the break lose part of their signal. Sleep behaviour matters too; NXP designed the wake detection of its TJA1043 so that a broken CAN-Low does not wake the network while it is going to sleep. A car with U0097 should still be checked for battery drain. To locate the break, Nissan advises splitting a harness with inline connectors into sections, testing one at a time and fitting a 120-ohm resistor in place of the terminating module.
U0097 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 U0097
- Modules beyond the break respond only sometimes
- Code with little effect on fault-tolerant layouts
Common causes of U0097
- Most likelyBroken (-) wire in the harness
- PossibleSpread or bent terminal losing contact
- Less likelyPoor earlier repair or splice in the (-) wire
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Bus h wiringCAN low wire
What each part of U0097 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 97 | The exact fault in that area. |
What to do next
- Note U0097 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 U0097
What does U0097 mean?
U0097 means "Vehicle Communication Bus H (-) Open". U0097 points to an open (-) wire on Vehicle Communication Bus H, CAN-Low if Bus H is a CAN. It is a generic code, so it means the same on every make.
Is it safe to drive with U0097?
U0097 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0097 fail an emissions test?
U0097 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 U0097 to fix?
Difficulty: hard. A typical repair takes 0.5 to 5 hours of work. This is a job for a workshop.
Will U0097 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.