ECU521214.09
John Deere ECU521214.09 – ECU: Key Authentication or Control Unit Authentication Failed
Issue description
The system has detected a failure in the key authentication or control unit authentication process. As a result, the engine controller has initiated an engine shut off to prevent unauthorized operation.
Check the cause
Key authentication system
Control unit authentication process
Repair steps
Verify
The key authentication system for the machine.
Verify
The control unit authentication process.
Parts you might need
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