Why is my Toyota Crown Signia so loud inside, and can I turn off the fake engine noise?

Short answer: Much of the noise owners complain about is ESE, a fake engine sound played through the speakers. Ask your dealer to turn it off. One owner had it done free at the 5,000-mile ToyotaCare service, and the setting is in Techstream under 'Other'. Owners have also turned it off with an OBD2 adapter and the Carista app.

Symptom: The engine sounds loud and droning inside the cabin, especially when the gas engine kicks on or you accelerate hard.

What to check first

1. Ask the service advisor to disable ESE in Techstream (Other menu).
2. If they say it doesn't exist, show them the owner reports.
3. Know that the engine running at startup to warm up is normal.
4. Leave the outside pedestrian warning sound alone.

Likely causes

1. Engine sound enhancement (ESE). ESE (engine sound enhancement) plays a recorded or synthesized engine sound through the speakers. Owners say it makes the Signia sound louder than it is, especially when the gas engine kicks in.
2. Normal hybrid engine behavior. The gas engine starts on its own to warm up, to charge the hybrid battery, or for power. That's normal and can make the cabin noisier at times.
3. Road and tire noise. Some of the noise is road and tire noise, which ESE doesn't affect.

What it usually costs

One owner's dealer disabled it free at the 5,000-mile ToyotaCare visit. Owners who used Carista paid for a one-month app subscription plus an inexpensive adapter.

Is it safe to keep driving?

Yes. It's a comfort issue, not a fault.

DIY or shop?

Using a coding app is DIY. A dealer can do it in a few minutes with Techstream.

Recalls, bulletins and complaints in plain words

• Recalls: NHTSA lists 3 recalls for the 2025-2026 Crown Signia, and none are about cabin noise. Check your VIN at nhtsa.gov/recalls. If your car is part of a recall, the dealer fixes it for free.
• Plain words: The complaint count below shows how often owners reported problems that mention these words to NHTSA. A count is not proof of a defect.
• NHTSA complaints: 2 keyword-matched complaints for Toyota Crown Signia 2025–2026 (of 14 unique complaints queried, NHTSA complaints API by model year, queried 2026-11-01; keywords: noise, loud, sound, engine noise, speaker) (NHTSA returned no data for 1 model-year queries). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In Engine noise on Reddit r/toyotacrownsignia, a shopper who test drove a Limited was put off by engine noise. An owner of six months said their dealer shut off the piped-in engine growl, but road noise remained. Others said to turn off ESE, and some felt the noise was mostly noticeable when the engine starts to charge the battery.
• In Turning off engine noises on Reddit r/toyotacrownsignia, an owner turned off ESE with a cheap OBD2 Bluetooth adapter and a one-month Carista app subscription and said it was very worth it. Others asked whether XLE trims have it too, and how to connect the adapter.
• In My Toyota Dealer does not know how to turn off fake engine noise in the cabin on Reddit r/toyotacrownsignia, an XLE owner's Toyota dealer didn't know how to turn it off. Others said the setting is in the dealer's Techstream software under the 'Other' menu as ESE, and some owners used Carista instead.
• In Engine Noise Experience on Reddit r/toyotacrownsignia, an owner had the dealer disable ESE at the 5,000-mile ToyotaCare service at no extra charge and said the cabin is noticeably quieter on hard acceleration. Another owner used Carista and left active noise cancellation on.

Quick tip

If quiet is why you bought the Signia, get ESE turned off at your first service. It's reversible.

Vehicle focus: Toyota Crown Signia hybrid, 2025-2026 (XLE and Limited).

Safety / mechanic note

Coding apps can change other settings, so record originals. Verify with a mechanic.