U0079
NetworkModule Communicationhigh severityControl Module Communication Bus H Open
What U0079 Means
The H communication bus circuit is open, breaking the data connection between modules. Affected modules stop sharing information.
Symptoms
- Lost communication
- Dash warning lights
- Features not working
Common Causes
- Open bus H wiring
- Broken connector pin
- Loose connection
- Faulty control module
Diagnostic Steps
- Scan network for U-codes
- Check bus H continuity
- Inspect connectors
- Repair open circuit or replace module
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITEShop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Community Confirmed Fixes
No confirmed fixes yet for this code. Be the first to contribute!
Submit a FixFound a Fix for U0079?
Help other technicians by sharing what worked on your vehicle.
Submit Your Fix