N.H. Rev. Stat. Ann. § 357-D:8

Nothing in this chapter imposes any liability on a franchised motor vehicle dealer or creates a cause of action by a consumer against a dealer, except for written express warranties made by the dealer apart from the manufacturer's warranties. A dealer shall not be made a party defendant in any action involving or relating to this chapter, except as provided in this section. The manufacturer shall not charge back or require reimbursement by the dealer for any costs, including, but not limited to, any refunds or vehicle replacements, incurred by the manufacturer arising from this chapter.