Phantom drain / battery loss
Why is your Tesla losing battery while parked?
Tesla phantom drain troubleshooting guide covering Sentry Mode, Cabin Overheat Protection, app wakeups, cold weather, third-party apps, and when to document service evidence.
Updated May 2026 · Owner guidance only: verify exact Tesla manual, service, warranty, battery, and software guidance for your vehicle and location.
Phantom drain is usually a settings and sleep-behavior investigation: Sentry, Cabin Overheat, app wakeups, climate, weather, and repeatable evidence.
Short answer
- Start with the obvious: Sentry, Cabin Overheat, climate preconditioning, Summon standby, and app wakeups.
- Measure parked loss over a fixed time window instead of reacting to one percentage drop.
- If drain is severe with obvious features off, document conditions and open service with clean evidence.
Next-step map
How to move from diagnosis to action
1 · Diagnose
Answer the exact problem
Use the short answer, applies-to table, and decision points to decide what is happening without bouncing back to Reddit.
2 · Act
Follow the practical checklist
Use the action plan as a small checklist: what to check, what to document, and what not to do.
3 · Choose
Route to the useful next step
If there is a real next step, use the relevant tool, guide, service-documentation page, or product path — not a random purchase.
Applies to
| Tesla model / owner type | Applies? | Why it matters |
|---|---|---|
| Model Y / Model 3 | Yes | The owner workflow is highly relevant; exact controls, battery, and software wording can vary by year. |
| Model Y Juniper | Yes | Juniper owners should verify current manual wording and refreshed hardware behavior before assuming older Model Y advice. |
| Model S / Model X | Mostly | The same problem pattern applies, but service access points, controls, and trim details can differ. |
| Cybertruck | Sometimes | Use the decision framework, then verify truck-specific manual and service guidance. |
Decision points: do this vs avoid this
Sentry Mode on
Do this: Expect higher parked consumption and decide if location security is worth it.
Avoid this: Calling it phantom drain when a power-hungry feature is intentionally active.
Third-party apps
Do this: Disable integrations temporarily and test whether the car sleeps normally.
Avoid this: Letting polling apps wake the car all night while troubleshooting.
Cold or hot weather
Do this: Separate climate/battery temperature effects from unexplained drain.
Avoid this: Comparing a freezing outdoor night to a mild garage night.
Repeat severe drain
Do this: Record SOC, time parked, settings, location, temperature, app/service warnings, and screenshots.
Avoid this: Opening service with only 'battery went down a lot'.
What owners get wrong
- • Leaving Sentry Mode or Cabin Overheat on and treating the result as mysterious drain.
- • Checking the app repeatedly during a sleep test and waking the car each time.
- • Changing five settings at once and learning nothing from the test.
- • Ignoring warnings or low-voltage messages that could explain abnormal parked behavior.
Practical action plan
- 1. Pick a fixed test window: note start/end state of charge, time, location, temperature, plugged/unplugged state, and settings.
- 2. Turn off or isolate Sentry Mode, Cabin Overheat Protection, scheduled climate, and third-party app polling for one test period.
- 3. Avoid repeatedly opening the Tesla app during the test because app checks can wake the car.
- 4. Compare results in similar conditions before and after each setting change.
- 5. If severe drain continues, open service with screenshots, timestamps, settings, temperature, and any warning messages.
Useful next steps
These links are included only when they solve the owner problem: documentation, charging routine, tire readiness, seasonal preparation, or service decision-making.
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Low-voltage battery warning
Repeated warnings change the drain conversation from settings to service evidence.
First-week Tesla setup
Set Sentry, app notifications, charging, and storage intentionally instead of inheriting random defaults.
Winter range loss
Cold weather can change both driving consumption and parked-energy expectations.
Verified facts and sources
Owner-practical framing from Model Y / Juniper daily use, service documentation, and accessory/fitment testing.
Related problems
Frequently Asked Questions
How much Tesla phantom drain is normal?
There is no useful universal number because settings, temperature, Sentry use, app wakeups, and sleep behavior matter. A repeatable test window is more useful than one anecdote.
Does Sentry Mode cause battery drain?
Yes. Sentry Mode is designed to keep monitoring active, so it can use meaningful energy while parked. Decide where it is worth using instead of treating it as unexplained drain.
Can checking the app cause drain?
Frequent app checks or third-party polling can wake the vehicle and interfere with sleep. During a drain test, reduce wakeups.