The Alliance for Automotive Innovation filed an amicus brief Monday in support of Volkswagen's petition to a U.S. court to reconsider a ruling that would allow state and local governments to regulate modifications to emission-control systems once a vehicle is sold.
The action comes after VW asked the 9th U.S. Circuit Court of Appeals in July to reconsider its ruling, which determined the Clean Air Act does not preempt state and local authorities from enforcing anti-tampering laws against manufacturers' post-sale updates to emission-control systems.
In the filing, the Alliance echoed the German automaker's position that permitting state and local governments "to apply their own prohibition on tampering to post-sale, model-wide changes" to vehicles would scrap regulatory certainty and create chaos.
The Washington auto lobbying group represents most major automakers, including Volkswagen, in the U.S.
The Alliance said manufacturers routinely update t…