Vehicle telematics: what it is and what your GPS is telling you right now

What vehicle telematics is (in one sentence)

Telematics is telecommunications plus computing applied to a vehicle: an onboard device captures data, transmits it over cellular or satellite networks, and a platform turns it into usable information. GPS is just one sensor in that chain — the one that provides position. Everything else comes from the vehicle itself.

That is why "I have GPS" says very little. Two devices that look identical from the outside can deliver completely different things: one reports latitude, longitude and speed, and the other also reads the vehicle's computer and warns you that the engine has spent 40 hours running above its normal temperature.

The CAN bus: the brain your vehicle already has

Almost every modern vehicle has an internal network called the CAN bus (Controller Area Network), designed by Bosch in 1986 and later standardized as an ISO norm. Its job is to let the vehicle's computers — engine, brakes, transmission, dashboard, sensors — talk to each other over a pair of wires instead of hundreds.

A telematics device connected to that network does not invent data: it listens to what the vehicle is already telling itself. That is where RPM, coolant temperature, real odometer, factory fuel level, door status and the fault codes behind your dashboard warning lights come from.

Not every device reads CAN, and not every vehicle exposes the same parameters. In a mixed fleet the normal outcome is a combination: CAN where possible, dedicated sensors where not. What matters is knowing which case you are in before you buy, not after.

What the engine tells you

The engine produces three data points almost nobody looks at and that predict problems weeks in advance: RPM, temperature and engine hours. Engine hours are especially useful because mileage-based maintenance lies in urban operations: a truck spending the day in Lima traffic accumulates wear the odometer never records.

With historical temperature and RPM you can tell a unit that is working under strain from one that is working normally. That is the jump from corrective maintenance (it broke, I fix it) to predictive maintenance (this is going to break, so it goes into the shop when I decide and not halfway to Trujillo).

And the vehicle's own fault codes reach the dashboard as soon as they are generated, instead of waiting for a driver to report that "a light came on".

Driver behavior, measured instead of debated

The accelerometer and the CAN bus record harsh braking, aggressive acceleration, sharp cornering and speeding. That turns driving into something measurable: it stops being an argument about perceptions and becomes a report per driver and per unit.

The interesting effect is rarely the report itself, but knowing it exists. Once the team understands that every hard brake is recorded, driving style changes on its own — and with it the wear on brakes, tires and clutch, plus the accident risk, which is the cost that really hurts.

The fuel tank: the data that pays for itself fastest

Fuel is usually a fleet's second largest cost after payroll, and it is where telematics pays for itself soonest. With a level sensor — factory data over CAN or a dedicated probe, depending on the vehicle — the system plots the tank curve across the day.

Normal consumption is a gentle slope. Siphoning is a vertical drop. When that drop happens at three in the morning at a point where the unit was not supposed to be stopped, there is nothing to interpret: the alert fires on its own, with time, coordinates and volume.

The same data serves the boring, profitable use: efficiency per unit, per route and per driver. That is where the unsuspected differences between two trucks running the exact same route show up.

Sensors you add depending on your operation

On top of position and CAN, each operation adds its own. The rule of thumb: if an event costs you money when it happens without you knowing, there is probably a sensor for it.

• Van or container door opening, with exact time and location
• Refrigerated cargo temperature, with an alert if it leaves range
• Fuel sensor for siphoning control and real efficiency
• Driver panic button, with immediate alert to monitoring
• Driver identification (key or card), to attribute every trip
• Remote engine cut, subject to usage protocol and device confirmation

The uncomfortable data point: thousands of installed devices that report nothing to the regulator

The best-documented case in Peru is public transport in Lima and Callao, because there a public count exists: of 21,700 authorized vehicles, roughly 13,500 already have GPS installed and only about 440 transmit to the Urban Transport Authority's monitoring system, according to figures the authority published in June 2026. That is some 13,000 devices bought, installed and paid for that are reporting nothing to the regulator.

The reasons repeat: the provider shut down or stopped supporting the account; the SIM data plan expired; the device was left pointing at a server that no longer exists; or simply nobody opened the platform again after the first month.

The good news is that in most of these cases there is no need to buy new hardware. The protocols of the most common brands in Peru — Teltonika, GT06, Coban, Sinotrack — are well known, and a provider with multi-brand capture capability can take that same device, reconfigure it and put it back on the air.

The question to ask your provider

One question organizes the whole commercial conversation: "besides location, what data does my device capture, and which of it can I see in the platform today?" If the answer stops at location and speed, you are paying for a radio on a vehicle that wants to give you a concert.

The follow-ups are just as simple: does the device read the CAN bus on my units or only the accelerometer? What additional sensors does it support? Can the reports be exported or only viewed? Does it retransmit to the regulator that applies to me — SUTRAN, OSINERGMIN, ATU — or is that a separate service?

In the end telematics justifies itself in three lines of the P&L: less fuel lost, maintenance that happens before the breakdown instead of after, and an operation you can audit without depending on what each person says. Your vehicle is already generating the information. The only thing you decide is whether anyone is listening.