2. SAE J1587 Equivalent Codes. Flash Code 55 (SAE J1587 Equivalents): SPN 231/12: J1939 data link fault; SPN 248/8: Proprietary data link fault (Master) SPN 248/9: Proprietary data link fault (Receiver) 3. Troubleshooting Flash Code 55 (A) Test Step 1: Determine the Fault. Turn the ignition ON. Connect the DDDL and read active codes.. To fix a J1939 code, start by checking the wiring connections and ensuring they are secure. If the issue persists, consult the manufacturer's diagnostic manual for troubleshooting steps related to the specific code. When dealing with vehicle diagnostic codes, finding the root cause is crucial for effective repair. J1939 codes specifically.
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If the ServiceRanger connection to the vehicle was lost or Fault Code 35 became Active while wiggling the J1939 Vehicle Data Link, refer to OEM guidelines for repair or replacement of J1939 Vehicle Data Link. Go to Step V. If no fault code set active, Go to Step C. Inactive Fault code troubleshooting - used when customer comes into the shop with a fault code(s) that was/were active at one point and just recently became inactive. Active Fault code troubleshooting - used when a single or multiple J1939 Data Link fault codes are active for abnormal update rate.
![[DIAGRAM] Freightliner J1939 Wiring Diagram](https://i.ytimg.com/vi/Icqga37R3Z8/maxresdefault.jpg "[DIAGRAM] Freightliner J1939 Wiring Diagram")
![[51+] J1939 Data Link Connector Wiring Diagram, Figure J4. Cable](http://repairguide.autozone.com/znetrgs/repair_guide_content/en_us/images/0996b43f/80/ae/92/7c/large/0996b43f80ae927c.gif "[51+] J1939 Data Link Connector Wiring Diagram, Figure J4. Cable")
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