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U3036: Communication Authentication Signal Performance

What Does U3036 Mean?

U3036 is a diagnostic trouble code indicating: Communication Authentication Signal Performance. This code relates to the vehicle systems 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

U3031 Ignition Output Off U3032 Ignition Output Accessory/Off U3033 Control Module Security Certificate Missing/Invalid U3034 Communication Authentication Key/Certificate Missing/Invalid U3035 Communication Authentication Signal Invalid Data U3000 Control Module U3001 Control Module Improper Shutdown Performance U3002 Vehicle Identification Number