My December 2006 Motor article, “J2534 Reprogramming: No Flash in the Pan,” discussed the evolution of J2534 reprogramming and provided an overview of the reprogramming process. If you know nothing about this subject, it would be helpful to review that article. Visit to download a copy. This article will focus on changes to the SAE J2534 standard and explain how to justify the cost of reprogramming and reprogramming equipment. It will also answer some frequently asked questions on the subject. The SAE J2534-1 standard has not changed since December 2006. However, additional vehicle manufacturers now offer J2534-1 reprogramming capability on their vehicles, and more aftermarket tool companies have made J2534-1 devices available.
As a reminder, J2534 reprogramming was included in the amendments to the Clean Air Act of 1990 and focuses on emissions-related powertrain control module (PCM) and transmission control module (TCM) reprogramming. J2534 was designed to provide a low-cost reprogramming solution to the aftermarket and covers 2004 and newer vehicles. Reprogramming access for non-emissions-related modules and older vehicles is not mandatory. The EPA has added language to the Clean Air Act suggesting that vehicle manufacturers provide reprogramming coverage back to 1996 model vehicles, if possible. Ford, Chrysler, GM and others do provide coverage for these older vehicles.