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Tesla VCSEC_a221

Air pressure below recommendation for tires Check pressure and refill air as needed

Common search variants: VCSECa221 · VCSEC-a221 · VCSEC a221 · Search ignores case and common separators.

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceNot yet established by verified evidence.
Confidence95%

Quick answer

VCSEC_a221 means the tire-pressure monitoring system (TPMS) detected that one or more tires is at least 20% below the recommended cold tire pressure. The alert does not itself indicate a flat tire. Check tire pressure and refill air as needed.

This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.

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#Tesla Air pressure below recommendation for tires #VCSEC_a221_TPMSSoftWarningDigital EV Doctor (Tesla alert clear)

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1. What does VCSEC_a221 mean?

VCSEC_a221 means the tire-pressure monitoring system (TPMS) detected that one or more tires is at least 20% below the recommended cold tire pressure. The alert does not itself indicate a flat tire. Check tire pressure and refill air as needed.

2. Technical explanation

Tesla documentation submitted to NHTSA states that VCSEC_a221 is triggered when TPMS detects air pressure in one or more tires at least 20% lower than the recommended cold tire pressure. The supplied evidence does not establish which specific tire is affected, why its pressure is low, or whether a tire is damaged.

3. What system is affected?

Tire Pressure Monitoring System (TPMS) / tires.

4. How serious is this code?

The diagnostic severity is recorded as unknown. The verified alert concerns tire pressure below recommendation.

5. Symptoms you may notice

  • A Tesla display alert reading: “Air pressure below recommendation for tires Check pressure and refill air as needed.”
  • TPMS detection that one or more tires is at least 20% below recommended cold tire pressure.

6. Possible causes

  • One or more tires has air pressure at least 20% lower than the recommended cold tire pressure.
  • The underlying reason for the lower tire pressure is not yet established by verified evidence.

7. Can I still drive the vehicle?

Not yet established by verified evidence.

8. Can I charge the vehicle?

Not yet established by verified evidence.

9. What you can safely do

  • Check tire pressure.
  • Refill air as needed.
  • Use the vehicle’s recommended cold tire pressure as the reference.

10. Step-by-step troubleshooting

  1. Confirm the active alert is VCSEC_a221.
  2. Check the pressure of the tires against the vehicle’s recommended cold tire pressure.
  3. Refill air as needed.
  4. The alert alone does not establish that there is a flat tire.

11. When to contact service

Not yet established by verified evidence.

12. What the service center may check

  • Verify the tire pressures relative to the recommended cold tire pressure.
  • Determine which tire or tires TPMS identifies as below recommendation. Further diagnostic or repair procedures are not established by the supplied verified evidence.

13. Possible repair or resolution

  • Refill air as needed. Any additional repair resolution is not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA manufacturer communication PDF 10250484, published 2023-12-01, includes Tesla owner-manual content for VCSEC_a221: https://static.nhtsa.gov/odi/tsbs/2023/MC-10250484-9999.pdf
  • NHTSA manufacturer communication PDF 10253666, published 2024-03-27, includes Tesla owner-manual content for VCSEC_a221: https://static.nhtsa.gov/odi/tsbs/2024/MC-10253666-9999.pdf

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified official evidence consists of Tesla owner-manual content submitted to NHTSA as manufacturer communications. It states that VCSEC_a221 does not indicate a flat tire and that TPMS has detected one or more tires at least 20% below recommended cold tire pressure. Example: https://static.nhtsa.gov/odi/tsbs/2023/MC-10250484-9999.pdf

19. Frequently asked questions

What does Tesla alert VCSEC_a221 mean?

It means TPMS detected that one or more tires is at least 20% below the recommended cold tire pressure.

Does VCSEC_a221 mean there is a flat tire?

No. Tesla’s documented alert text states that this alert does not indicate that there is a flat tire.

What action does the alert specify?

Check tire pressure and refill air as needed.

Which vehicles are covered by the supplied applicability evidence?

US-market Tesla Model 3 (2013–2024), Model S (2012–2024), Model X (2016–2024), and Model Y (2020–2024), based on overlapping supplied applicability records. Exact applicability for an individual vehicle is not further established by verified evidence.

20. Sources & verification

Accepted ResearchVerified
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