scope:

This part of ISO 15031 provides recommended uniformity for alphanumeric trouble codes. It further provides guidance for uniform messages associated with these codes. It specifies several sections addressing format, structure, messages, and a few examples, and is applicable to electrical/electronic systems diagnostics of motor vehicles. Annex A specifies the diagnostic trouble code naming guidelines for signals from components. Annex B specifies the actual code assignments and description for Powertrain system diagnostic trouble codes. Annex C specifies the actual code assignments and description for network communication. Annex D specifies the DTC Failure Category and Sub Type definition of the DTCFailureTypeByte which is an extension of a base DTC to more precisely describe the fault symptom of the DTC. Additional annexes for body systems and chassis systems are under preparation.