OBD vs Hardwired GPS Trackers: Which Is Right for Your Fleet?

What “OBD” usually means in fleet tracking

In fleet marketing, “OBD tracker” usually means a unit that draws power from the OBD-II socket without cutting into loom wires. It is popular for light vans because fitment is fast and reversible.

That convenience has limits. OBD sockets vary by vehicle, can be shared with diagnostic tools, and may lose power in ways that interrupt tracking. Not every commercial vehicle has a convenient, always-available socket in the right place. For many HGVs, an OBD-style fit is the wrong starting assumption.

What hardwired installs deliver

A hardwired install connects the tracker to vehicle power, usually with ignition sense, and may add CAN/FMS or tachograph-related wiring where the product supports it. The goal is a durable fit that survives workshops, daily use and long journeys.

Hardwiring is the normal path for artic and rigid HGVs when you want reliable tracking, behaviour events tied to ignition, or bus data such as fuel level and RPM on supported terminals. It should be done by a competent installer — FleetPro recommends professional fit and does not sell a bookable installation service.

• Stable power and ignition reference for trip and event accuracy
• Less risk of the unit being unplugged or moved between vehicles unnoticed
• Path to CAN/FMS signals on capable hardware such as the FMC650
• Required foundation if you later want tachograph-linked remote download on eligible FMC650 installs

Side-by-side comparison

How FleetPro’s FMC003 and FMC650 fit

FleetPro Tracking positions the FMC003 (see live catalogue pricing) as the 4G OBD plug-and-play option for cars, vans and light commercial work: live GPS and trip history on Essential or Pro. It is not an HGV hardwire or remote-tacho path.

The FMC650 (from £89.99 ex VAT) is the HGV-oriented terminal. When wired to FMS/CAN it can surface fuel, RPM and eco-related signals on Pro and HGV plans. Remote tachograph download, when available, is intended only for compatible FMC650 installs on HGV + Tacho — light trackers such as the FMC003 do not provide remote tachograph download. See FMC650 in the FleetPro shop.

Which approach suits your fleet?

Choose OBD plug-and-play when vehicles are light vans or cars with a free OBD port, you need a quick reversible fit, and location plus trips are enough. Choose hardwired when vehicles are HGVs, you need ignition-stable trips, CAN/FMS, lower unplug risk, or you are planning toward tachograph-linked remote download on FMC650.

Mixed fleets often run both: FMC003 OBD units on vans, FMC650 hardwired on HGVs. Keep the plan tier aligned with what each vehicle actually needs rather than putting every asset on the most expensive plan.

Install quality and safety

Poor wiring causes intermittent tracking, flat batteries and workshop call-backs. Do not treat a blog post as a wiring diagram. Use competent fitters for hardwire jobs, protect fuses, and verify ignition and ground after the job. For OBD installs, confirm the socket is free and the unit seats firmly. FleetPro ships kits and recommends professional hardwire for HGV — we do not book the labour ourselves.

Questions operators ask

Is the FMC003 an OBD tracker?

Do I need hardwiring for HGVs?

In practice yes for a durable, ignition-aware fit — especially if you want CAN/FMS or a future remote tachograph path on FMC650. Professional fit is strongly recommended.

Which device supports remote tachograph download?

In our range, only compatible FMC650 installs on the HGV + Tacho plan when that service is available. Enquire on remote tachograph download. Light trackers such as the FMC003 do not provide remote tachograph download.

Where do I see prices and plans?

Catalogue roles and plan tiers are summarised on fleet GPS tracking.