What you can see
Movement, smoke, leaks, warning lights and where the problem appears.
Video · warning lights · locationA new way to understand your car
Your car is giving you a signal. Let's read it.
Identify the vehicle, describe the symptom and add a short video if you can—it is strongly recommended. Signal measures the sound on your device, combines it with the vehicle, codes, warning lights and your words, then shows what the evidence does and does not support.
Free on-device beta
Designed to inform, never to replace a qualified mechanic.
Searches a protected vehicle-data connection. Provider credentials stay on the server and are never sent to your browser.
Registration lookups are sent securely to the configured vehicle-data provider.
01 — Read the signs
Start with what the car is actually doing.
Cars usually give you more than one clue. It might be a noise when you turn, a warning light from cold or a vibration under braking.
Signal keeps the vehicle, the video and your description together, helping you narrow down what to check and explain the problem more clearly to the garage.
What you can hear
The type of noise, when it happens and what makes it change.
Noise · timing · changeThe vehicle itself
Make, model, year and engine—because the same symptom can mean different things on different cars.
Make · model · engine02 — How it works
From “that sounds wrong” to a better next step.
A simple capture flow turns an uncertain symptom into something easier to explain and investigate.
Identify the vehicle
Use a registration or choose the make, model, year and engine.
Film the signal
Capture 10–30 seconds safely, with the sound and source in frame.
Add the context
Explain when it happens, how long it lasts and what makes it change.
Compare likely matches
See ranked possibilities, the clues behind them and useful next steps.
03 — Symptom library
Built around problems drivers actually notice.
Drivers usually notice a noise, smell, vibration or warning light before they know the name of the fault. That is where Signal starts.
Brake squeal
High-pitched sound while slowing
Battery or alternator
Slow crank, clicking or dim lights
Engine misfire
Uneven idle, vibration or hesitation
Wheel bearing
Humming that rises with road speed
Coolant leak
Drips, steam or a sweet smell
Exhaust rattle
Metallic vibration under the vehicle
04 — Your Signal workspace
More than a one-off diagnosis.
Signal connects the evidence review with saved records for drivers, a separate operating view for garages and traders, and a community library built from real vehicle outcomes.
For drivers
Keep your vehicles, MOT and tax dates, service intervals and private symptom evidence together.
- Saved vehicle garage
- On-screen due-date tracking
- Private video cases
For motor trade
Create a business profile, track stock progress and keep vehicle videos attached to a case.
- Private stock inventory
- Preparation-to-sold status
- Trade diagnostic desk
Driver field notes
Use practical buying checks and common-car inspection prompts before spending money.
- Used-car walkaround
- Cold-start and road-test notes
- Model-specific starting points
Community cases
Compare real symptom videos and return later to record what an inspection or repair actually found.
- Public vehicle symptom videos
- Owner and verified-trade outcome labels
- Separate opt-in for AI supporting evidence
CONNECTED BETA
Live in this build: free on-device audio measurement, optional browser sound AI, offline OBD/warning triage, saved vehicle records, private files and community cases.
Still being connected: configured Google/email authentication, scheduled reminder emails, approved government vehicle-history access and a trained automotive vision model.
Free model stack: Transformers.js with the AudioSet sound classifier; no OpenAI credit is used by this path.
05 — Safety by design
Useful guidance without pretending it is certain.
Signal ranks evidence patterns without dressing them up as a percentage. It shows what supports each possibility, what conflicts with it and when a safety concern needs to come first.
✓ Shows how strong the match is✓ Flags when not to keep driving✓ Explains what led to the result
The goal
“Help me understand the symptom—and help me explain it properly to the person fixing it.”
Signal is not the mechanic. It is the clearer first conversation before the inspection.
Product principle / Signal AutomotiveSignal Automotive
Hear something strange?
Start with a Signal.