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U0047: Vehicle Communication Bus C Performance

Severity
Low
NHTSA Reports
1
Vehicles Affected
1
System
Powertrain

What Does U0047 Mean?

U0047 is a diagnostic trouble code indicating: Vehicle Communication Bus C Performance. This code relates to the network communication system. It has been reported in NHTSA complaints across 1 different vehicle models.

Most Reported Vehicles for U0047

Based on NHTSA owner complaint data.

# Vehicle Reports
1 HONDA ACCORD

Frequently Asked Questions

What causes communication codes?
Usually a wiring issue, corroded connector, failed module, or dead battery. The CAN bus network connects all your car's computers.
Can a bad battery cause network codes?
Yes. Low voltage can cause communication failures between modules. Always check battery health first — it's the cheapest potential fix.

What To Do Next

Possible Fixes

  • 🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
  • 🔧 Check battery voltage and ground connections; inspect CAN bus wiring
  • 🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)
  1. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

Related Codes

U0042 Vehicle Communication Bus B (-) Open U0043 Vehicle Communication Bus B (-) Low U0044 Vehicle Communication Bus B (-) High U0045 Vehicle Communication Bus B (-) shorted to Bus B (+) U0046 Vehicle Communication Bus C U0048 Vehicle Communication Bus C (+) Open U0049 Vehicle Communication Bus C (+) Low U0050 Vehicle Communication Bus C (+) High