Fluid Leak Diagnosis - Tesla Model 3 2020
Brown/black fluid leaking under a Tesla Model 3 likely indicates an oil leak from the drive unit (motor/gearbox) or possibly brake fluid contamination. This requires immediate attention to prevent drivetrain damage or safety issues.
Diagnosis Details
Possible Causes
Drive unit oil seal failure (most common in Tesla Model 3 with high mileage or manufacturing defect)
Brake fluid leak (brown/black if old or contaminated; often near calipers or lines)
Coolant leak (rarely brown/black unless mixed with oil or debris; typically pink/blue)
Related OBD-II Codes
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What You Should Do
Do not drive the vehicle if the leak is large or you suspect brake fluid.
Check fluid levels (brake reservoir, drive unit oil).
Inspect undercarriage for source.
Tow to a Tesla service center or qualified EV mechanic for diagnosis and repair.
Related Repairs
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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.