A vehicle shows up at the YYZ cargo warehouse, on schedule, paperwork "done" - and gets turned away at the gate. It happens more often than exporters expect, and almost always for the same handful of reasons.
Every vehicle is dangerous goods, full stop
The most common misunderstanding: an empty tank, a disconnected battery, or a "just a classic car" argument doesn't change anything. Under IATA's Dangerous Goods Regulations, a vehicle is classified as dangerous goods because of what's built into it - residual fuel vapour, the battery, airbag propellant - not because of what's currently in the tank. Airlines check for a valid Shipper's Declaration and Safety Data Sheet on file before they'll accept the cargo, regardless of how "clean" the vehicle looks.
The three rejection patterns we see most
No SDS on file for the specific vehicle. A generic SDS from a different model year or trim doesn't satisfy the requirement. Airlines want documentation that matches the exact vehicle being shipped.
EV batteries missing their own classification. A lithium-ion vehicle battery carries its own UN number and packing instructions under the DGR, separate from the vehicle's classification. Exporters who prepare a Shipper's Declaration for the vehicle but skip the battery-specific requirements get flagged at acceptance.
Missing or incorrect Shipper's Declaration fields. The DGR specifies mandatory fields - UN number, proper shipping name, class or division, packing group, and a signed certification. Missing even one is enough for ground staff to refuse the shipment outright.
What actually prevents the rejection
A Shipper's Declaration and validated SDS prepared before the vehicle reaches the warehouse - not scrambled together after a rejection notice. That's the entire service: review or source the SDS, confirm classification, prepare the declaration, sign off as an IATA-certified specialist.
If you're exporting inventory, a single vehicle, or need a DG specialist to sign off on behalf of a freight forwarder, see how the process works end to end.