Tesla Model Y 2021 - Starts Then Dies
The vehicle starts briefly but then immediately dies. This is a critical issue that prevents normal operation and requires immediate diagnosis.
Diagnosis Details
Possible Causes
Low 12V battery or battery failure - The 12V auxiliary battery is weak or failing, causing the contactors to drop out after initial engagement.
High voltage (HV) battery isolation fault or contactor issue - The HV battery contactors may be failing to stay closed due to a fault or low state of charge.
Faulty DC-DC converter - The converter that charges the 12V battery from the HV battery is malfunctioning, leading to a rapid voltage drop.
Related OBD-II Codes
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What You Should Do
Check the 12V battery voltage (should be above 12.4V at rest).
If low, jump-start or replace the 12V battery.
If the 12V battery is good, inspect the HV battery state of charge and contactor status via the vehicle's diagnostic interface.
A Tesla service center or mobile technician should perform a full system scan.
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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.