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U0051: Vehicle Communication Bus C (-) Open

What Does U0051 Mean?

U0051 is a diagnostic trouble code indicating: Vehicle Communication Bus C (-) Open. 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

U0046 Vehicle Communication Bus C U0047 Vehicle Communication Bus C Performance U0048 Vehicle Communication Bus C (+) Open U0049 Vehicle Communication Bus C (+) Low U0050 Vehicle Communication Bus C (+) High U0052 Vehicle Communication Bus C (-) Low U0053 Vehicle Communication Bus C (-) High U0054 Vehicle Communication Bus C (-) shorted to Bus C (+)