Allegations of diesel emissions cheating have now hit Ford, with a lawsuit filed Wednesday in Detroit federal court by a group of pickup truck owners.

The lawsuit, led by consumer rights firm Hagens Berman, representing Ford F-250 and F-350 Super Duty owners, states that Ford rigged its heavy-duty trucks to cheat emissions tests, with an alleged emission of nitrogen oxide 50-times the legal limit.

Early class action participants believe Bosch, Ford’s supplier partner and named defendant, led a colluded effort to tweak software enabling Ford to modify its fuel levels, heavily overseen by regulators including the U.S. Environmental Protection Agency and California Air Resources Board.

In turn, Ford has defended itself from the onset.

“All Ford vehicles, including those with diesel engines, comply with all U.S. EPA and CARB emissions regulations,” said Ford spokesman Daniel Barbosa to Bloomberg News, “Ford vehicles do not have defeat devices. We will defend ourselves against these baseless claims.”

Bosch has also chimed in with an emailed statement by Bosch spokesman Rene Ziegler.

“Bosch takes the allegations of manipulation of the diesel software very seriously. Bosch is cooperating with the continuing investigations in various jurisdictions, and is defending its interests in the litigation. As a matter of policy, and due to the sensitive legal nature of these matters, Bosch will not comment further concerning matters under investigation and in litigation.”

Another complaint talking point has been Ford’s alleged violation of 58 consumer and trade laws, with its low-emission claims at the epicenter. Low-emissions result in premium pricing for its diesel trucks, costing $8,4000 more than its regular gas-powered version, in what Ford marketed as the “cleanest super diesel ever.”

Emissions-cheating scandals have plagued automakers in recent years, with the most glaring example being Volkswagen’s Sept. 2015 confession of rigging diesel cars to mask emissions, resulting in more than $25 billion in penalties and an all-out effort to fix or phase out roughly 500,000 vehicles.

Penalties have also included a buyback of North American cars, which is estimated to cost $3 billion. Today, Volkswagen is looking to move forward with a push to build electric versions of all of its models by 2030.

Bloomberg News