What Causes Vehicle Authentication Failure and Failure to Start?

[LucilleMarie]

Engine authentication failure leading to failure to start may be due to a dead key fob battery, a malfunction in the push-button start function, or faults in the body control module or circuitry. It is recommended to contact your local 4S dealership for inspection and repair. Below are the relevant details: Items to check: (1) Verify whether the anti-theft system is locked. (2) Determine if the starting system is functioning (whether the starter motor is operating). (3) If the starting system is normal, check if the ignition system is functioning properly; if the starting system is abnormal (e.g., slow cranking), inspect the battery voltage, starter motor for faults, or excessive engine resistance; if the starter motor does not operate, examine the starter motor's circuit and solenoid switch. (4) Check if the fuel supply system is functioning correctly.