Vehicle Health Monitoring

Vehicle health monitoring is the continuous tracking of a vehicle's technical condition using onboard electronics and telematics. Instead of waiting for a warning light or a breakdown, fleet teams receive data on fault codes, battery, fluids, tires and mileage, and can plan maintenance before a minor issue takes the vehicle off the road.

What vehicle health monitoring tracks

The vehicle's control units constantly measure how its systems behave. A monitoring set-up collects and shares the most useful signals:

• Fault codes: a diagnostic trouble code (DTC) is stored when a control unit detects an anomaly, from a misfire to an emissions fault.
• Battery state: auxiliary battery voltage on combustion vehicles, charge level and charging status on electric vehicles.
• Engine and fluids: coolant temperature, oil level or oil life indicators when the vehicle exposes them.
• Tires: pressure data from a tire pressure monitoring system.
• Usage: mileage, engine hours and fuel level, which drive service intervals.

How the data reaches the fleet team

There are two main routes. On many recent cars and vans, the manufacturer's connected platform sends vehicle data to the cloud, where fleet software can read it with the right authorisation. On other vehicles, a telematics device connected to the on-board diagnostics port or the CAN bus reads the signals and transmits them over the mobile network. The available data depends on the make, model and age of the vehicle.

Why it matters for a company fleet

• Fewer breakdowns: a fault detected early is usually cheaper and quicker to fix.
• Higher availability: workshop visits are planned around the vehicle's schedule instead of being forced by a failure.
• Safety: brake, tire or engine warnings are handled before the vehicle is driven again.
• Better records: each alert and repair adds to the maintenance history, useful for resale and warranty claims.

Vehicle health monitoring is the foundation of condition-based maintenance, where work is triggered by the real state of the vehicle rather than by the calendar alone.

How Dadycar helps

Dadycar is a French fleet management software that brings vehicle condition and maintenance into one place. Telematics reads vehicle data without a box on compatible connected vehicles, with an optional tracker for the others. Configurable alerts flag anomalies, while reminders and due dates keep servicing on track. Inspections and condition reports document each vehicle, and work orders follow repairs to completion. The AI agent Donna answers fleet questions in plain language. Data is hosted in France, with OVHcloud.

FAQ

Does vehicle health monitoring require extra hardware?
Not always. Many recent connected vehicles share their data through the manufacturer's platform. Older vehicles need a telematics device to collect it.

Is a dashboard warning light enough?
It warns only the driver, often late. Monitoring sends the information to the fleet team, which can decide quickly and keep a record.

What is the difference with preventive maintenance?
Preventive maintenance follows fixed intervals. Health monitoring adds the vehicle's real condition, so work can be brought forward or adjusted when the data shows a problem.