U0065
Vehicle Communication Bus E Performance
Data bus (CAN)
Generic OBD-II
Medium
What it means
U0065 means Communication Bus E is working but performing poorly — messages are delayed, corrupted, or intermittent rather than fully absent. This usually points to a marginal wiring or connector problem, or a module that occasionally disrupts the bus, so features may glitch now and then.
Medium
Can I keep driving? Generally drivable since the fault is intermittent, but expect occasional glitches and warning lights on Bus E systems; diagnose before it worsens.
Common symptoms
What you'll notice
- Intermittent warning lights that come and go
- Occasional loss of features tied to Bus E
- A module dropping off the scan intermittently
- Stored performance-type communication codes
Common causes
Most likely first
- Loose or corroded connector causing intermittent bus contactLikely
- Chafed wiring making occasional contactCommon
- A marginal module intermittently disrupting the busCommon
- Water intrusion that acts up with temperature or vibrationLess often
- Weak battery or charging causing borderline bus voltageLess often
How to diagnose & fix
Work through it in order
- Scan all modules and note which report intermittent communication.
- Check battery and charging voltage first.
- Wiggle-test the Bus E harness and connectors while watching for dropouts.
- Inspect for corrosion and moisture in bus connectors.
- Isolate an intermittently faulty module by disconnecting units one at a time.
FAQ
Quick answers
Is it safe to drive with U0065?+
Usually yes, because the fault is intermittent, but features may glitch. Diagnose it before the connection fails completely.
Can I just clear U0065?+
It will reset when the intermittent fault recurs. Track down the loose connection or marginal module first.
Related codes
Often seen with U0065
Read & clear U0065 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX