The plaintiff sought certification of a class action against Mercedes-Benz entities, alleging that BlueTEC diesel vehicles contained "defeat devices" that turned off emission controls below 10 degrees Celsius, leading to excessive nitrogen oxide emissions.
The action primarily claimed economic loss due to negligent misrepresentation, alongside statutory claims under the Canadian Environmental Protection Act and Competition Act, and common law claims for negligence, unjust enrichment, breach of warranties, and waiver of tort.
The court granted certification for 14 of the 17 proposed common issues, revising three and declining to certify three (negligence, breach of express/implied warranties, and aggregate damages).
The decision clarified the "some basis in fact" test for common issues, emphasizing a one-step approach focused on class-wide commonality, and reiterated that aggregate damages are for the quantum of loss, not proof of liability, requiring liability to be established first.