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U0046: Vehicle Communication Bus C

What Does U0046 Mean?

U0046 is a diagnostic trouble code indicating: Vehicle Communication Bus C. This code relates to the network communication system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

What To Do Next

  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

U0041 Vehicle Communication Bus B (+) High 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 (+) U0047 Vehicle Communication Bus C Performance U0048 Vehicle Communication Bus C (+) Open U0049 Vehicle Communication Bus C (+) Low