U0408
NetworkModule Communicationmoderate severityInvalid Data Received From Body Control Module
What U0408 Means
The computer is getting bad data from the body control module over the network. This can affect lighting, locks, and other body electronics.
Symptoms
- Body electronics malfunction
- Warning lights on dash
- Erratic lighting or lock operation
Common Causes
- Faulty body control module
- Bus wiring or connector fault
- Corroded or loose connectors
- Software or programming error
Diagnostic Steps
- Scan all modules for codes
- Check power and ground to BCM
- Inspect data bus wiring and connectors
- Review BCM live data with scan tool
🔌 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
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