• Fault Code Protocols for J1587 & J1939

    Protocols for a J1587 and J1939 fault code. Repair-Connect.net uses several different diagnostic protocols as defined by Society of Automotive Engineers (SAE). In this blog post, we’ll look at the older J1587 protocol and its replacement, the J1939 diagnostic protocols used on today’s commercial vehicles. SAE originally developed the J1587 protocol for heavy-duty and most […]