The U.S. Attorney’s Office for the Middle District of Pennsylvania has announced that Ryan Spencer, 33, of Harrisburg, PA, was charged by criminal information on April 4, 2025, with conspiracy to impede the lawful functions of the Environmental Protection Agency (EPA) and to violate the Clean Air Act, as well as individual violations of the Act.
According to Acting United States Attorney John C. Gurganus, the information alleges that between 2013 and March 12, 2024, Spencer, while a Service Manager at Pro Diesel Werks, LLC (doing business as Pro Diesel Werks), conspired with Pro Diesel Werks owner Roy Ladell Weaver and others to disable hardware emissions control systems on customers’ diesel vehicles. This process is commonly referred to as “deleting.”
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The information further alleges that Spencer and his co-conspirators tampered with the vehicles’ emissions diagnostic systems to prevent the software from monitoring the deleted emission control system hardware, a practice known as “tuning.”
On February 19, 2025, a federal grand jury indicted Weaver and Pro Diesel Werks for similar charges: conspiracy to impede the lawful functions of the EPA and to violate the Clean Air Act, and individual violations of the Clean Air Act.
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The EPA’s Criminal Investigations Division conducted the investigation. Assistant U.S. Attorney David C. Williams, Environmental Crimes Section Trial Attorney Ronald A. Sarachan, and Environmental Crimes Section Senior Trial Attorney Richard J. Powers are prosecuting the case.
The maximum penalty for these offenses under federal law is seven years of imprisonment, a term of supervised release following imprisonment, and a fine. The actual sentence will be determined by a judge based on federal sentencing statutes and guidelines.
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