Michigan Compiled Laws, Chapter 257. Motor Vehicles § 257.1307b

(a) Disclaim or limit the implied warranty of merchantability or fitness for use, unless excluded or modified under section 2316 of the uniform commercial code, 1962 PA 174, MCL 440.2316.

(b) Fail to extend the period of a facility's own warranty for repairs and services, if the customer was deprived of the use or enjoyment of the subject of the warranty because of a failure on the part of the facility to comply completely with the terms of the warranty, for a period of time that is equal to or greater than the period of the deprivation.

(c) Fail to honor a warranty on a new part by replacing it with a used part or replacing it with a rebuilt or remanufactured part that does not meet original equipment quality, standards, or specifications, or that does not comply with the warranty repair requirements of the warrantor.

(d) Fail to honor an express warranty.

(e) Fail to disclose in written language, that is clear as to the nature or scope of the warranty, all material aspects and the intent of a warranty, including, but not limited to, what is warranted, the person that will honor the warranty, the duration of the warranty, the obligations, if any, of the person to which the warranty is extended, and any exceptions and exclusions from the terms of the written warranty agreement.