Tesla Model Y Clicking Sound and Starting Issue
The clicking sound and intermittent starting failure in a 2021 Tesla Model Y typically indicate a low or failing 12V auxiliary battery, which is critical for engaging the high-voltage contactors and powering the vehicle's computer systems.
Diagnosis Details
Possible Causes
12V auxiliary battery is weak or failing, unable to hold sufficient charge to close the main contactors, resulting in a rapid clicking noise from the contactor relay.
Loose or corroded 12V battery terminal connections, causing intermittent electrical contact and voltage drop during startup.
Faulty high-voltage contactor or DC-DC converter, preventing the main battery from powering the 12V system properly.
Related OBD-II Codes
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What You Should Do
First, try jump-starting the 12V battery using the front trunk (frunk) access terminals.
If the car starts, the 12V battery likely needs replacement.
If jump-starting fails, inspect and clean the 12V battery terminals.
If the issue persists, schedule service with Tesla to test the high-voltage system and contactors.
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.