Japan Inc. Bows Again: Kawasaki Heavy Admits Over 30 Years of Data Falsification, Affecting Hundreds of Ships and Submarines

Japan’s Ministry of Defense announced last Friday that it has imposed a two-and-a-half-month bidding ban on Kawasaki Heavy Industries, temporarily barring the company from participating in government procurement tenders.

On the same day, Kawasaki released a follow-up report addressing the manipulation of test data for marine engines. The company acknowledged that submarine engines manufactured for the Japan Maritime Self-Defense Force (JMSDF) were also involved—specifically, that fuel-efficiency data had been falsified.

According to the report, falsification in fuel-consumption performance testing for submarine engines produced for the JMSDF continued for more than 30 years.

Back in August 2024, Kawasaki had already admitted to improper conduct involving the alteration of test data for ship engines, a case that reportedly covered a total of 673 marine engines.

Investigators noted that all 25 submarines currently in active JMSDF service are equipped with engines produced by Kawasaki. Prior to these findings, the company had consistently maintained that its engines posed no safety issues.

However, authorities later confirmed that between 1988 and 2021, all 66 submarine engines delivered by Kawasaki to the Ministry of Defense contained falsified fuel-consumption data.

A Ministry of Defense investigation report stated that, during trial runs, the measured fuel-consumption rates in most cases failed to meet military requirements. The report also alleged that multiple internal departments colluded to conceal the falsification over an extended period.

In response, Kawasaki President Yasuhiko Hashimoto bowed in apology at a press conference and issued a statement expressing deep regret. He said the company would strengthen corrective and preventive measures to rebuild public trust, and added that disciplinary action against those involved is under consideration. The bidding ban is scheduled to run from this Friday through March 11 next year.

Separately, the Ministry of Defense also released disciplinary outcomes related to a bribery scandal. Of the 11 JMSDF personnel implicated, three non-commissioned officers responsible for ship maintenance and supply bases—who also oversaw shipbuilding contracts—received suspension penalties.

The remaining eight active-duty and retired submarine personnel received one-month salary reductions: four had one-sixth of their pay cut, three saw a 10% reduction, and one crew member—after a 20% pay cut—has submitted a resignation.

As one of Japan’s key defense equipment manufacturers, Kawasaki is now facing a serious credibility blow. The combined impact of long-running fuel-efficiency data falsification, a bribery scandal, and a government bidding ban is expected to weigh heavily on both its reputation and its defense business.

Notably, in recent years, Japan has seen a wave of corporate misconduct allegations. Major automakers—including Toyota, Mazda, Yamaha, Honda, and Suzuki—have been linked to collective irregularities in engine certification processes. Meanwhile, East Japan Railway Company (JR East) and industrial heavyweight Keio Heavy Industries have also faced separate falsification controversies, shaking public confidence across sectors.

Online reactions have been sharp. Some commenters quipped that Japan’s famed “craftsmanship spirit” has turned into a “bowing spirit,” while others argued that repeated falsification scandals are steadily eroding the reputation of Japanese industry.