Tire Pressure Monitoring System — Hard Warning (Possible Flat Tire)
The TESLA-VCSEC_a228 (VCSEC (Vehicle Controller Security)) EV fault code means: Tire Pressure Monitoring System — Hard Warning (Possible Flat Tire). This is a critical severity code.
- Keep driving?
- No — stop driving
- DIY difficulty
- moderate
- Estimated cost
- $0-$25 DIY if only the key card needs replacement (Tesla sells replacement cards for about $25). B-pillar NFC reader replacement runs $150-$400 at an independent shop or $200-$600 at a Tesla service center including parts and labor.
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Common Symptoms
- Alert VCSEC_a228 shown on the touchscreen
- The vehicle may log the alert without any change the driver notices
Probable Causes (Ranked by Likelihood)
- The vehicle reported VCSEC_a228. Tesla's firmware identifies this alert as "VCSEC_a228_TPMSHardWarning" — the tyre pressure monitoring system's most severe warning; the dictionary states plainly that one or more tyres may be flat. High
Frequently Asked Questions
What does VCSEC_a228 mean?
Tire Pressure Monitoring System — Hard Warning (Possible Flat Tire). Tesla's firmware identifies it as "VCSEC_a228_TPMSHardWarning".
Can a generic OBD2 scanner read this?
No. Tesla alerts are a manufacturer-specific system and appear in no SAE standard, so a generic OBD-II scan tool cannot read or clear them. The alert text on the touchscreen and the Tesla app are the authoritative sources.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
Read the alert text on the touchscreen exactly as shown — Tesla's own wording is more specific than any third-party list, this page included.
Check for a Tesla service bulletin or a pending software update; a number of alerts clear on their own after an over-the-air update.
If the alert persists, request service through the Tesla app. Tesla alerts are not standard OBD-II codes and a generic scan tool will not read or clear them.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- Tesla alert dictionary (canonical firmware alert identifiers)community-maintained dictionary, not an official manufacturer document
Commonly Affected Vehicles
- Tesla Model 3 (RWD, Long Range AWD, Performance)
- Tesla Model Y (LR AWD, Performance)
- Tesla Model S (LR, Plaid) -- less common, uses different entry system
- Tesla Model X (LR, Plaid) -- less common, uses different entry system
- Tesla Cybertruck (RWD, AWD, Cyberbeast) -- early production units reported NFC pairing issues
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