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U0303: Software Incompatibility With Transfer Case Control Module

What Does U0303 Mean?

U0303 is a diagnostic trouble code indicating: Software Incompatibility With Transfer Case Control Module. This code relates to the manufacturer-specific network 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

U0298 Lost Communication With DC/DC Converter Control Module A U0299 Lost Communication With DC/DC Converter Control Module B U0300 Internal Control Module Software Incompatibility U0301 Software Incompatibility With ECM/PCM U0302 Software Incompatibility With Transmission Control Module U0304 Software Incompatibility With Gear Shift Control Module A U0305 Software Incompatibility With Cruise Control Module U0306 Software Incompatibility With Fuel Injector Control Module