Electric Vehicle

Tesla 2021 Model Y Performance

What is likely to break, when it happens, and how expensive it can be — from source-linked reports.

Reliability signal — · Insufficient data · data confidence Very Low

1 failure reports

Reliability summary

What is likely to go wrong, when it happens, and how expensive it can be — from source-linked failure reports.

Reliability signal

—

1 failure report · Insufficient data · Data confidence: Very Low

Need at least 5 failure-signal reports before showing an A–F grade.

Most common issue: High-voltage battery failure
Typical first failure: —; Median of reports with timing
Median repair cost: —; Reported costs only
Highest reported repair: —; Not a guarantee

What breaks?

Failure types

Click a type in the reports section below to filter.

High-voltage battery failure1 · 100%

When does it break?

Failure timing

Months after purchase, using reports that included timing.

No timing data yet for this model.

What does it cost?

Reported repair costs

Distribution of owner-reported repair costs — not a quote or guarantee.

No reported repair costs yet for this model.

Median months to failure

—

Failure reports

Median repair cost

—

Still recommend

—

% repaired

100%

% mfr warranty

100%

% extended warranty

—

% support helpful

Use these reports as a risk signal, then check current listings before you buy.

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What breaks?

What breaks? · reports

High-voltage battery failure

HV battery (BMS_a079)

Source-linkedVerify source — Reddit post

Used 2021 Model Y Performance bought around December 2023 with under 10k miles showed BMS_a079 HV battery failure mid-trip home from Texas at about 26k miles after overnight charging to 80% in Flagstaff. Tesla would only tow to the nearest service center in Phoenix, not back to California; Phoenix service said the battery would be replaced but parts would take a couple of days, forcing a flight back to pick up the car.

UnverifiedEvidence ★★★☆☆Mfr warranty

View report details

Months until failure

Not stated

Repair cost

Not stated

Repaired

Yes

Manufacturer warranty

Yes

Extended warranty

Not stated

Support helpful

Would recommend

Not stated

AI extraction confidence

93%

Verification status

Unverified

Evidence quality

★★★☆☆ (3/5)

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