Tesla Model Y 2021 No Start – No Sound
The vehicle shows no response when attempting to start, with no audible sounds. This indicates a complete electrical or high-voltage system failure, likely due to a dead 12V battery, a failed DC-DC converter, or a high-voltage battery issue.
Diagnosis Details
Possible Causes
12V auxiliary battery is dead or failed – most common cause in Tesla vehicles, especially in cold weather or after long periods of inactivity.
High-voltage (HV) battery contactor failure or BMS fault preventing power-up.
DC-DC converter failure, which charges the 12V battery from the HV battery.
Main fuse or pyro fuse blown due to a short circuit or impact.
Related OBD-II Codes
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What You Should Do
First, try jump-starting the 12V battery using the front tow hook access point (refer to owner's manual).
If the car powers on, drive to a service center to replace the 12V battery.
If jump-starting fails, check for any error messages via the mobile app or contact Tesla Roadside Assistance.
Do not attempt to open high-voltage components yourself.
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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.