Looks like they aren't investigating anymore.
UPDATE 10/26/16: NHTSA has closed its investigation into this issue. No further investigation will be conducted and no recall will be issued.
NHTSA’s explanation of its decision is as follows:
NHTSA conducted a comprehensive review of data related to this subject. Our report, documenting this review, is available in the document file for this defect petition. It will also be published in the Federal Register.
Of the 2,505 referenced complaints, 638 relate to a potential hazard (unable to maintain speed, no motive power, engine stall) and 1,867 concern customer satisfaction issues including, but not limited to, repair cost, vehicle shudder and shake, and engine overheating.
Taking into account the allocation of agency resources and priorities and the likelihood that additional investigation would result in a finding that an unreasonable risk to highway safety exists, we conclude that further investigation is not warranted and deny the petition.
https://www.ncconsumer.org/news-article ... terra.html