Tesla Phantom Drain: What Uses Power While Parked

Last updated: July 2, 2026 · ~9 minute read

What's normal (and what isn't)

With every optional feature off and the car allowed to sleep, a healthy Tesla loses roughly 1% per day parked — sometimes less. The car periodically wakes to check in with Tesla's servers, keep the 12V/low-voltage system topped up, and manage the battery, and that housekeeping costs a little energy.

What people actually complain about — 3, 5, 10+ miles of range gone overnight — is almost never mysterious. It's a feature you (or your settings) left on. The fix is knowing which features keep the car awake, because an awake Tesla burns 10–20× more than a sleeping one.

The offenders, ranked

1. Sentry Mode — the #1 cause by a mile. Sentry keeps the cameras, the computer, and the autopilot hardware powered continuously; the car never sleeps while it's on. Budget roughly 250–350 watts, which works out to ~10–15 miles of range per 24 hours. Left on for a two-week trip, Sentry alone can consume a third of the pack.
2. Cabin Overheat Protection. On a hot day, the A/C variant cycles the compressor for up to 12 hours after you park. Sunbelt owners can lose several miles a day to this in summer. The fan-only ("No A/C") setting costs far less.
3. Climate left running. Dog Mode, Camp Mode, and Keep Climate On do exactly what they say — they run the HVAC indefinitely. Fine on purpose; expensive by accident.
4. Third-party apps polling the car. Any app or integration that repeatedly asks the car for status keeps waking it (or never lets it sleep). A misconfigured stats app quietly costs miles every day. Well-built integrations wait for the car to be awake or batch their requests — if your drain is unexplained, audit what has access to your Tesla account.
5. Summon Standby (where equipped/enabled) keeps the car listening for a Summon command — convenient, but it's another "never fully asleep" setting.
6. Temperature extremes. Deep cold increases battery-management overhead and temporarily locks some capacity (the snowflake icon); brutal heat drives the cooling loop. You can't toggle the weather, but you can expect a few extra percent per day at the extremes — and park in a garage when you can.
7. The long tail: frequent app checks from your own phone (each one wakes the car briefly), Wi-Fi/LTE housekeeping, waiting software downloads, and scheduled preconditioning you forgot about.

How to measure your own drain

1. Note charge % when you park for the night (car screen or app), and again in the morning before opening the app repeatedly — every app open wakes the car and muddies the measurement.
2. Change one variable at a time. Two nights with Sentry on, two nights off, same parking spot. The delta is your Sentry cost, in your climate, on your car.
3. Use the energy app's "Parked" category (recent software) — it attributes consumption while parked so you can see the drain directly instead of inferring it.

How to minimize it

• Scope Sentry Mode: Settings → Safety → Sentry Mode → exclude Home (and Work/Favorites if you trust those lots). You keep protection where you're vulnerable and sleep where you're not.
• Set Cabin Overheat Protection to "No A/C" unless you regularly leave kids' crayons or electronics in a hot car — or turn it off entirely in mild seasons.
• Audit third-party access in your Tesla account security settings; remove integrations you no longer use, and prefer ones that are polite about polling.
• Stay plugged in at home. Tesla's own manual says it: "a plugged-in Tesla is a happy Tesla." Drain still happens, but the wall absorbs it instead of your range — and scheduled charging means it's absorbed at off-peak rates (see scheduled charging with AI).
• Check the charge, not the car. If you just want to know the battery level, a status request that reads cached data (like asking your AI assistant) is gentler than repeatedly foregrounding the Tesla app, which forces a wake.

The airport-parking checklist

Leaving the car for one to three weeks:

1. Charge to ~80–90% before you leave. Don't leave it sitting at 100% for weeks (the pack prefers not to sit full), and don't cut it so close that drain could take you uncomfortably low.
2. Turn Sentry Mode off — or accept ~1%+ per day. In a patrolled airport garage, most owners turn it off; if you keep it on for a week-plus, do the math first.
3. Turn Cabin Overheat Protection off (nothing perishable is in the car, right?).
4. Disable Summon Standby and any scheduled precondition/departure times.
5. Don't obsessively check the app from vacation — every check wakes the car. Once every few days is harmless.
6. Expect the math to work: a sleeping car at ~1%/day for 14 days is ~15%; leaving at 85% brings you home to ~70%. Sentry-on for the same trip could bring you home under 40%.

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