Vehicle privacy basics
What is a telematics module?
Updated September 2026
Somewhere behind your dash or seat there's a small box with its own cellular connection and GPS. It's how the automaker knows where your car is and how it's driven. Here's what it is, what it sends, and what you can do about it.
Short answer
A telematics module (often called a TCU, Telematics Control Unit) is a cellular modem and GPS receiver built into your vehicle. It powers features like crash calling and remote start from your phone, and it sends location, driving, and vehicle-health data back to the manufacturer. It’s separate from your phone, so it keeps working even if you never download the app.
What it does
- Safety features: automatic crash notification, SOS buttons, and stolen-vehicle location.
- App features: remote start, lock and unlock, and finding your car from your phone.
- Wi-Fi hotspot and over-the-air software updates.
- Data collection: location, trips, speed, hard braking, mileage, fuel or battery levels, and diagnostic codes, sent to the manufacturer.
What each brand calls it
| Brand | Service name | The module |
|---|---|---|
| Chevrolet, GMC, Buick, Cadillac | OnStar | VCIM (Vehicle Communication Interface Module) |
| Ram, Jeep, Dodge, Chrysler | Uconnect | TBM (Telematics Box Module) |
| Ford, Lincoln | FordPass / Lincoln Way (SYNC Connect) | TCU, sometimes built into the APIM |
| Toyota, Lexus | Toyota / Lexus connected services | DCM (Data Communication Module) |
| Honda, Acura | HondaLink / AcuraLink | TCU |
| Hyundai, Kia, Genesis | Bluelink / Kia Connect / Genesis Connected | TCU |
Our step-by-step guides currently cover the first three rows: GM, Stellantis, and Ford.
Why it matters
The data doesn’t always stay with the automaker. GM shared driving data from its OnStar Smart Driver program with data brokers who sold reports to insurers, which led to an FTC order in January 2026 and a $12.75 million California settlement in May 2026. See how insurers get driving data.
Does it work if I never signed up?
On many vehicles, yes. The modem has its own cellular connection from the factory. Declining the app or letting a trial subscription lapse turns off the features you see, but the hardware stays powered and can keep sending data or be switched back on remotely.
Your options
- Opt out in the app or account. Free and reversible, but it relies on the automaker honoring the setting. See each automaker’s options.
- Disable the module. Pulling a fuse (Ford and many GM vehicles) or unplugging the module (Ram and Jeep) stops the car from sending anything. This is what our guides cover.
Not sure what’s in your car? Here’s how to check for any tracker, factory or aftermarket.
Turn yours off, step by step
Our $35 guides show exactly where the module is on GM, Ram/Jeep/Dodge, and Ford vehicles, and how to disable it with reversible methods. Instant PDF download.
Common questions
+What does TCU stand for in a car?
Telematics Control Unit. It's the built-in cellular modem and GPS receiver that connects the vehicle to the manufacturer. Brands use their own names, like GM's VCIM, Stellantis's TBM, and Toyota's DCM.
+Does every new car have a telematics module?
Most cars sold in the U.S. in roughly the last decade do, especially trucks and SUVs. Many come with it active from the factory, even if you never sign up for the app or a subscription.
+Is the telematics module the same as the infotainment system?
Usually not. On most vehicles it's a separate box behind the dash, glovebox, or seat. On some Fords it's built into the APIM, the module behind the SYNC screen.
+Is it safe to disable the telematics module?
Yes, when done correctly. It isn't part of the airbag, brake, or steering systems. You lose connected features like automatic crash calling, remote start from the app, and the Wi-Fi hotspot.