The Case
In September 2015, the US Environmental Protection Agency revealed that Volkswagen had programmed approximately 11 million diesel vehicles worldwide with “defeat device” software, code that activated emissions controls only during laboratory testing. On the road, those vehicles emitted up to 40 times the legal limit of nitrogen oxides (NOx), a harmful air pollutant linked to respiratory disease.
The deception spanned model years 2009 through 2015 and was marketed under the banner of “Clean Diesel,” a campaign claiming 90% NOx reductions and positioning diesel as cleaner than petrol. The Federal Trade Commission later found the vehicles emitted up to 4,000% more NOx than legally permitted.
The financial consequences were severe. In January 2017, Volkswagen pleaded guilty to three criminal felony counts. Total US settlements reached $14.7 billion, covering consumer buybacks, environmental remediation, and civil penalties, making it one of the largest corporate fraud settlements in history. CEO Martin Winterkorn resigned within days of the story breaking. Several executives were charged criminally, and additional penalties followed in Germany and across Europe.
Dieselgate became the case that moved “greenwashing” from academic and NGO circles into mainstream boardrooms and newsrooms. It demonstrated that engineering fraud into products, not merely exaggerating environmental credentials, could trigger catastrophic and irreversible reputational and legal consequences. The case set a precedent for the wave of greenwashing enforcement that followed across financial services, advertising, and investment products, with the FTC, EPA, and DOJ all playing roles in the US action alone.
For communications professionals, the lasting lesson is that environmental claims must be verifiable. Every claim creates a future accountability surface, and when the gap between promise and practice is revealed, the documentation that was supposed to build credibility becomes the prosecution’s evidence.
Timeline
- 2009 First vehicles with defeat device software enter production
- 2009-2015 Approximately 11 million cars sold worldwide with cheat software under the "Clean Diesel" campaign
- 2014 West Virginia University researchers discover real-world emissions anomalies during on-road testing
- Sep 2015 EPA issues notice of violation; CEO Martin Winterkorn resigns days later
- 2016 FTC charges Volkswagen with deceiving consumers; civil settlements begin
- Jan 2017 VW pleads guilty to three criminal felony counts; $14.7B US settlement finalised
- 2017 onwards European authorities pursue parallel cases; additional penalties in Germany and across Europe
The Debate
Dieselgate raises a fundamental question about corporate environmental claims: where does optimistic marketing end and fraud begin? Volkswagen did not merely exaggerate, it engineered deception into the product itself. But the case sits at one end of a spectrum. Many companies make environmental claims that are technically accurate in isolation but misleading in context. The question for regulators, and for the communications professionals who advise companies, is how far down that spectrum enforcement should reach.
Critics argue that Dieselgate was an extreme outlier, deliberate criminal fraud, and that using it as a reference point for all greenwashing risks overstating the problem. Most companies that overstate their environmental credentials do so through carelessness or ambition, not conspiracy. Treating every vague sustainability claim as a potential Dieselgate creates a chilling effect that discourages genuine communication about real, if imperfect, progress.
Defenders of stricter enforcement counter that the line between carelessness and intent is exactly what regulators should test. The lesson of Volkswagen is not that every company is committing fraud, it is that without robust verification, no one can tell the difference. If environmental claims carry financial value (and they do, through green premiums, consumer preference, and regulatory advantage), then they must carry the same evidentiary standard as any other material claim.
You Might Not Expect
The paper trail that made it worse, not better