Car

Tesla Model Y (2021)

1 source-linked failure report. Most reported: PCS failed one week after HV battery replacement; $3,000 quote. Median repair $3,000.

Reliability signal — · Insufficient data · data confidence Very Low

1 confirmed failure reports

Reliability summary

What is likely to go wrong, when it happens, and how expensive it can be — from source-linked failure reports. Counts are reports in our database, not a population failure rate.

Reliability signal

—

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

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

Most common issue: PCS failed one week after HV battery replacement; $3,000 quote
Typical first failure: —; Median of confirmed reports with timing
Median repair cost: $3,000; Reported costs · Mostly Mixed markets
Highest reported repair: $3,000; Not a quote · costs differ by country

What breaks?

Failure types

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PCS failed one week after HV battery replacement; $3,000 quote1 · 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 (mostly mixed markets)— not a quote or guarantee. Labor and parts prices vary by country.

Median months to failure

—

Failure reports

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Median repair cost

$3,000

Still recommend

—

% repaired

100%

% mfr warranty

% extended warranty

—

% support helpful

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What breaks?

What breaks? · reports

PCS failed one week after HV battery replacement; $3,000 quote

PCS

$3,000

Forum / discussionIndexed Oct 8, 2026Cost market · MixedSource-linkedVerify source — Reddit post

Reddit: "2021 Model Y - PCS failed one week after HV battery replacement. Tesla says $3,000 to replace it.". Looking for some advice from anyone who's dealt with something similar. I have a **2021 Tesla Model Y with about 64,600 miles**. Last week, Tesla **replaced my high-voltage battery under warranty**. About **one week later**, my car started throwing multiple errors: * Electrical system power reduced * Vehicle may shut down unexpectedly * DC-DC not supporting LV bus * PCS communication faults * Wouldn't shift into Drive * Eventually wouldn't power on at all, despite the HV battery still showing around **78% charge**. I had the car towed to Tesla (they're reviewing reimbursement for the tow).

UnverifiedEvidence ★★★☆☆Not under mfr warranty

View report details

Months until failure

Not stated

Repair cost

$3,000

Repaired

Yes

Manufacturer warranty

Extended warranty

Not stated

Support helpful

Would recommend

Not stated

AI extraction confidence

84%

Verification status

Unverified

Evidence quality

★★★☆☆ (3/5)

Discussion

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