Tire Pressure Monitoring System — Soft Warning (Low Tire Pressure)
The TESLA-VCSEC_a221 (VCSEC (Vehicle Controller Security)) EV fault code means: Tire Pressure Monitoring System — Soft Warning (Low Tire Pressure). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $0 if cleared by soft reset or drive cycle. 12V battery replacement DIY $80-$150 in parts. Siren replacement DIY $100-$200 in parts, moderate difficulty. Professional diagnosis and VCSEC reconfiguration at an independent shop $150-$400. Tesla Service Center VCSEC module replacement $400-$900 including labor.
A $30 car code reader can't do diesel. The HD7000 reads full-system codes and does parked DPF regen, idle/speed-limit, and service resets from the cab — on everything from a 6.7 Cummins/Power Stroke/Duramax pickup to Class-8 trucks (Detroit, Paccar, CAT, Volvo, Mack, International).
Full-system 6/9/16-pin diesel scan tool for Cummins, Paccar, CAT, Detroit and more — plug-and-play, no subscription. A cheaper way to read heavy-duty codes a basic OBD2 scanner skips entirely.
Affiliate links — we earn a commission at no extra cost to you.
Common Symptoms
- Alert VCSEC_a221 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_a221. Tesla's firmware identifies this alert as "VCSEC_a221_TPMSSoftWarning" — the tyre pressure monitoring system flagging one or more tyres below the recommended pressure. High
Frequently Asked Questions
What does VCSEC_a221 mean?
Tire Pressure Monitoring System — Soft Warning (Low Tire Pressure). Tesla's firmware identifies it as "VCSEC_a221_TPMSSoftWarning".
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)
- Tesla Model X (LR, Plaid)
- Tesla Cybertruck (RWD, AWD, Cyberbeast)
Related Codes
Explore More
Was this helpful?
Send this to whoever is fixing the truck — your tech, or the person asking what the fault means.