Executive Summary: Key Legal and Evidentiary Issues

• Scope of Quebec consumer protection law is central, particularly whether Mazda’s failure to disclose a “substantial weakness” in the Mazda 3 locking system breaches article 228 and triggers remedies under article 272 LPC.
• Collective action mechanics are engaged, with two distinct groups of Mazda 3 owners and a split proceeding: first on liability (2016 Court of Appeal decision), then on quantification of damages (2020 Superior Court, 2022 Court of Appeal).
• Product defect and informational vice are framed as an “informational defect” affecting consent, rather than a traditional physical defect claim alone, shaping what kind of damages can be recovered.
• Admissibility and reliability of expert evidence are decisive, as the CROP survey and PWC report used to support a price-reduction claim are rejected due to serious methodological weaknesses.
• The presumption of prejudice under articles 228 and 272 LPC is interpreted as giving a right to seek a contractual remedy, but not as an automatic entitlement to a quantified monetary award absent proper proof of loss.
• Appellate review focuses on whether the trial judge erred in refusing to award a reduction of the sale price and in declining to “arbitrate” a percentage reduction when the only pleaded quantification method failed, ultimately confirming Mazda’s success and leaving the precise monetary amounts for approved Group 1 indemnification and for costs undetermined on the face of the decisions.

Facts of the case

The litigation concerns certain Mazda 3 vehicles from model years 2004 to 2007, acquired during a specified period and equipped with a door locking system alleged to be unusually weak. Owners claimed that this weakness made their vehicles easier to break into and more vulnerable to theft and damage. The core allegation was not simply that the locking system was defective, but that Mazda Canada Inc. failed to disclose this important fact to consumers at the time of purchase.
The case was authorized and pursued as a class action (action collective) with two groups of consumers. Group 1 consisted of owners who allegedly suffered thefts or damage linked to the weak locking system. Group 2 comprised owners whose vehicles were affected by the weakness but who did not necessarily suffer a theft or break-in. The representative plaintiff, Lise Fortin, brought the proceedings on behalf of these groups against Mazda Canada Inc.
At the heart of the dispute lay the interplay between a technical weakness in an automotive product and the obligations imposed by Quebec’s consumer protection regime. The plaintiffs argued that the undisclosed locking weakness reduced the value and utility of their vehicles and that, had they been properly informed, they either would not have purchased the vehicles or would have insisted on a lower price. This alleged loss of value and associated risk formed the basis for a claim not only for direct material damages (for thefts and repairs), but also for a reduction of the sale price reflecting the informational defect.

The first Court of Appeal decision in 2016: liability and initial remedies

In an earlier judgment rendered on 15 January 2016 (Fortin c. Mazda Canada inc., 2016 QCCA 31), the Quebec Court of Appeal addressed the question of Mazda’s liability. The proceedings were split (scission d’instance), so this first appellate decision dealt only with liability issues and the availability in principle of certain heads of damages, leaving the detailed quantification of losses for a later phase.
In that 2016 ruling, the Court of Appeal concluded that Mazda had violated article 228 of the Loi sur la protection du consommateur (LPC) by “passing sous silence” an important fact: a substantial weakness in the locking system with which certain Mazda 3 vehicles were equipped. The omission of this important fact constituted a prohibited business practice and was characterized as a “vice informationnel” or informational defect.
This violation of article 228 LPC triggered a presumption that the prohibited practice had an adverse effect on consumer consent. The Court explained that, under the LPC, such a finding leads to an irrebuttable presumption that the consumer’s consent was vitiated by the omission and that the consumer may seek one of the statutory contractual remedies listed in article 272 LPC. Among those remedies, the Court specifically recognized that certain members of the two groups had the right to claim a diminution of the price of their Mazda 3 vehicles under article 272(1)(c) LPC, as a form of reduction in their contractual obligation.
At the same time, the 2016 Court of Appeal carefully circumscribed the available remedies. While it allowed compensatory damages for Group 1 members who suffered theft or material damage connected to the locking weakness, it rejected claims for moral or exemplary damages. It also redefined the scope of the groups entitled to claim price reduction, narrowing them to holders of certain Mazda 3 vehicles acquired in a specific period and still equipped with the deficient locking system at the time of purchase.
Having determined liability and the general contours of available remedies, the Court of Appeal remitted the case to the Superior Court to conduct the second phase: the quantification of the various heads of damages and the practical implementation of any indemnification or price reduction.

The Superior Court judgment in 2020: quantification and rejection of price reduction

On return to the Superior Court, the case focused on determining how much the class members should receive, and under which heads of damages. The trial judge first approved an indemnification plan for Group 1’s material and insurance damages arising from thefts and physical damage to vehicles traced to the locking weakness. The specific sums to be paid under this plan, however, are not detailed in the materials at hand and therefore cannot be stated with certainty.
The more contentious issue, and the one that ultimately led to the 2022 appeal, was the claim for a reduction of the sale price of the vehicles under article 272(1)(c) LPC for members of both Group 1 and Group 2. The representative plaintiff’s demand was framed in a very specific way. The claim depended entirely on a CROP consumer survey that purported to measure how much less consumers would have been willing to pay for a Mazda 3 had they been informed of the locking weakness.
Based on the CROP survey’s results, PricewaterhouseCoopers (PWC) produced a forensic accounting report calculating the alleged monetary impact on the purchase price for the affected groups. The pleadings sought a global reduction of price grounded solely on this expert-driven methodology. No alternative method of calculation or subsidiary approach was advanced; the case on price reduction rose or fell with the CROP/PWC model.
Mazda responded with its own expert evidence, including a statistician and an automotive market expert. These experts identified serious methodological problems with the CROP survey design, its sample, and its interpretation, as well as flaws in PWC’s damage calculations. The trial judge accepted the essence of Mazda’s expert critiques and concluded that the CROP survey and PWC report were neither reliable nor valid bases for quantifying a reduction of the sale price.
The judge then addressed a critical point of consumer law: whether the presumption of prejudice arising from articles 228 and 272 LPC relieves plaintiffs of the burden to prove the amount of their economic loss. He held that, although the statute deems there to be an “effet préjudiciable” on consent and gives consumers the right to seek a contractual remedy, the plaintiffs still bear the burden of proving and quantifying the economic impact of the informational defect. The presumption opens the door to relief; it does not supply the amount of that relief.
Because the only pleaded method of quantification (the CROP/PWC model) was rejected in its entirety and because no other evidence established a measurable loss of resale value or market value attributable to the informational defect, the trial judge concluded that the plaintiffs had failed to prove the monetary prejudice necessary for a reduction of the sale price. He also noted that granting purely nominal damages would, in the circumstances, amount to awarding the equivalent of moral or exemplary damages, which the Court of Appeal had already refused in 2016.
On that basis, the Superior Court dismissed the claim for a reduction of the sale price under article 272(1)(c) LPC for both groups, while maintaining the separate indemnification plan for Group 1’s material and insurance losses.

The 2022 Court of Appeal decision: confirmation of the trial judgment

In 2022, the plaintiffs appealed the Superior Court’s refusal to order a reduction of the sale price. They argued that, in light of the 2016 Court of Appeal judgment, the existence of a compensable prejudice had already been definitively settled (res judicata). In their view, once the Court had previously recognized a violation of article 228 LPC and the corresponding presumption of prejudice, the trial judge could not refuse to quantify that prejudice and should have granted at least some level of price reduction, even if the CROP/PWC evidence was discarded.
The Court of Appeal rejected this interpretation. It clarified that the 2016 decision established a violation of article 228 LPC and the resulting irrebuttable presumption that the prohibited practice affected consumers’ consent. This legal consequence entitles consumers to seek one of the remedies under article 272 LPC, including a reduction of their obligations. However, it does not automatically guarantee that such a remedy will be granted in a particular monetary amount. The prejudice associated with the informational defect still must be quantified on the basis of admissible and persuasive evidence.
The Court emphasized that the trial judge did not “refuse” to quantify the prejudice; rather, he examined the evidence and found that the plaintiffs had simply failed to provide a valid, reliable method of quantification. The only quantification approach they had pleaded and supported with expert evidence was the CROP/PWC methodology, which the judge was entitled to reject.
On appeal, the plaintiffs also invited the Court of Appeal to “arbitrate” a reasonable percentage reduction of the purchase price based on other evidence in the record, including some testimony from buyers who said they would not have purchased the vehicles had they known of the locking weakness. The Court acknowledged that a trial judge can sometimes exercise discretion to fix or arbitrate the quantum of damages. In this case, however, the plaintiffs had not raised any alternative or subsidiary method of quantification in first instance; they had chosen to put all their weight on the CROP/PWC model.
The Court of Appeal held that it was not its role to conduct a fresh, hypothetical debate over damages based on approaches that were never seriously advanced at trial, nor to speculate about what might have been awarded under a different theory. Because the plaintiffs had failed to demonstrate any palpable and overriding error in the trial judge’s analysis of the evidence, there was no basis to interfere. Consequently, the Court dismissed the appeal and confirmed the Superior Court’s rejection of the price-reduction claim.

Legal practice areas and broader significance

Several practice areas intersect in this case. First, consumer protection law is at the forefront, particularly the interpretation and application of articles 228 and 272 LPC concerning misleading omissions and contractual remedies. Second, the case is a classic example of complex class action litigation in Quebec, with defined groups, phased proceedings, and the need to design and administer group-wide remedies. Third, elements of product liability are present, as the underlying factual matrix involves an alleged design weakness in an automotive locking system and its impact on theft risk and property damage. Finally, evidence law and appellate civil procedure play key roles in shaping how expert surveys and damage models are admitted, scrutinized, and reviewed.
Collectively, the decisions underscore that, even in a consumer class action where a statutory presumption of prejudice exists, plaintiffs must still advance and prove a robust, methodologically sound approach to quantifying monetary loss. Courts may recognize a right to seek a remedy in principle while nonetheless declining to award a specific sum if the evidentiary foundation for quantification is deficient.

Outcome and orders, including the successful party and monetary consequences

Across the two appellate decisions, the outcomes reflect a mixed picture. In 2016, the Court of Appeal partially allowed the plaintiffs’ appeal on liability, finding that Mazda had breached article 228 LPC by failing to disclose an important fact about the locking system, and opening the door to compensatory damages for certain theft-related losses and to potential price-reduction claims. In the subsequent Superior Court phase, an indemnification plan was approved for Group 1’s material and insurance damages, but the plaintiffs’ broader claim for a reduction of the sale price was dismissed.
In the 2022 judgment, the Quebec Court of Appeal confirms that dismissal. Mazda Canada Inc. is the successful party at this appellate stage, as the Court expressly rejects the plaintiffs’ appeal and maintains the trial judgment, awarding Mazda its costs of the appeal. The decisions available, however, do not specify either the detailed monetary amounts to be paid under the Group 1 indemnification plan or the quantified value of the appellate costs awarded to Mazda. As a result, while it is clear that Mazda prevails on the price-reduction issue and is entitled to its appellate costs, the total monetary award or costs in Mazda’s favor cannot be determined from the text of these decisions.