Attachment B – OBD2 codes
Your Flux2 Display will read, display, and clear OBD2 Digital Trouble Codes (DTC’s) which are alpha numeric codes used to aid in
vehicle troubleshooting. There are literally thousands of DTC’s used by your vehicle.
Proprietary DTC’s
Some of those DTC’s are proprietary to the manufacturer and, as such, the manufacturer is not compelled to disclose what those
codes mean. Your Flux2 Display may display unusual characters or may display all ??????’s if it is unable to interpret the data
generated by these proprietary DTC’s. An internet search or a phone call to a certified dealer may help you determine the fault.
Open source DTC’s
Many DTC’s are by legislation common across all manufacturers and must be readable by testing centers for emissions compliance.
Your Flux2 Display will properly display these codes and you can find the plain text description for each of these codes by doing an
internet search of the code.
DTC code structure.
DTC codes are formed by a single letter and four numbers,
each of which have specific meaning… for example, your
Flux2 Display may report a DTC of P0300. This is an open
source DTC for a random engine misfire; from the graphic
below you can see that P means this is a Powertrain fault, the
first 0 indicates it is an Open Source DTC, the 3 indicates the
DTC is in the Ignition System, and the final 00 is the specific
fault indicator… in this case “random.”
DTC codes are further separated into either “stored” or “pending” codes. A stored DTC is one that the factory ECU has decided is
an actual failure while a pending DTC is one that has intermittently failed or is in the process of failing. Both Open Source and
Proprietary codes can be stored or pending.
Freeze Frame Data — Freeze frame data is a listing of the parameters which existed when a DTC was generated and are useful for
troubleshooting vehicle problems. Not all DTC’s have associated freeze frame data.
