Why does my Infiniti QX55 brake or beep for nothing in front of it?

Short answer: False braking or beeping on a QX55 usually comes from a dirty or failing sensor in the bumper, grille or windshield area. Owners also saw it tied to battery-related codes. Clean the sensors, test the 12V, and if it keeps happening, document each event and push the dealer to replace the sensor at fault. Sudden phantom braking is a safety problem, so don't just live with it.

Symptom: The car warns of an object ahead and brakes when nothing is there, or the parking sensors beep and the screen shows obstacles that aren't there.

What to check first

1. Clean the front grille emblem area, the windshield behind the mirror and every parking sensor.
2. Check for bumper damage or a recent repair near the sensors.
3. Have the 12V battery tested.
4. Note the date, time, speed and weather for every false event.
5. Try lowering the sonar sensitivity in the settings menu.
6. Ask the dealer for a sensor calibration check and a scan for stored codes.
7. Run your VIN at nhtsa.gov/recalls.

Likely causes

1. Dirty or blocked front radar or camera. The forward collision system uses a radar and camera behind the grille and windshield to spot things ahead. Dirt, bugs, snow or a bad bumper repair can confuse it. One owner's dealer blamed a dirty sensor first.
2. Failing parking (sonar) sensor. Parking sensors are the small round buttons in the bumpers. One owner's right front sensor kept alarming for no reason and was replaced after three dealer visits.
3. Low 12V voltage or electrical codes. One dealer tied an owner's false alerts to codes it found related to the battery. Driver aids can act up when the 12V voltage is low.
4. System sensitivity setting. Owners say turning down the sonar (parking sensor) sensitivity in the settings menu cuts down false alarms. It doesn't fix a failing sensor.

What it usually costs

Owners didn't post prices. Their repairs were done by the dealer, likely under warranty. Out of warranty, a parking sensor or a calibration is shop work.

Is it safe to keep driving?

Phantom braking can get you rear-ended. If it happens often, you can turn off forward emergency braking in the settings as a short-term step, but then you lose that protection. Drive with extra space behind you and get it fixed.

DIY or shop?

Cleaning sensors and changing settings is DIY. Replacing and calibrating radar or cameras is shop work.

Recalls, bulletins and complaints in plain words

• Recalls: NHTSA lists 2 recalls for 2022-2023 QX55: 23V187000 (2023: the wrong front right door latch may have been installed) and 25V437000 (2022 QX55 with the 2.0L variable compression turbo engine: an internal engine recall). Neither is about forward collision braking or parking sensors. NHTSA's recall lookup returned no data for 2024-2025. 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: 3 keyword-matched complaints for Infiniti QX55 2022–2025 (of 14 unique complaints queried, NHTSA complaints API by model year, queried 2026-11-02; keywords: brak, forward, collision, emergency, sensor, phantom, sonar, parking) (NHTSA returned no data for 2 model-year queries). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In 2022 Infiniti QX55 Forward Collision Sensor Malfunctioning on Reddit r/infiniti, an owner of a used 2022 QX55 Luxe with about 20,000 miles said the car kept warning about an object in the road and braking when nothing was there. Infiniti looked at it twice in two months, first blaming a dirty sensor and then some codes it read on the battery, and the yellow warning light came back within a week.
• In QX55 Issues on Reddit r/infiniti, a 2022 QX55 Essential owner with ProPilot and about 20,000 miles said the right front parking sensor kept firing for no reason, and it took three dealer visits to get it replaced. It still acted up now and then, and the left one may be starting too. A reply suggested lowering the sonar sensitivity in the settings.

Quick tip

Write down every false event. Dealers often can't make it happen on a test drive, and a log makes the case.

Vehicle focus: Infiniti QX55, 2022-2025.

Safety / mechanic note

Unexpected braking is a crash risk. Verify with a mechanic.