International SA 33 SPN 567 FMI 6: Forward Axle 1 Diff lock air solenoid output overcurrent

SA 33 SPN 567 FMI 6 on International / Navistar trucks means: Forward Axle 1 Diff lock air solenoid output overcurrent. The failure mode (FMI 6) is “current above normal or grounded circuit”.

Code details

Manufacturer: International (Navistar)
Applies to: International / Navistar body controller (ESC) and multiplexed modules
Fault code: SA 33 SPN 567 FMI 6
J1939 SPN: 567
FMI: 6 — Current above normal or grounded circuit
Reporting module: Body Controller (source address 33)
Component / signal: Differential Lock State - Front Axle 1
Truck models in source: 3200, 4100, 4300, 4400, 7300, 7400, 7500, 7600, 7700, 8500, 8600, BE 200, CE Bus, CXT, DuraStar, LoneStar, MXT, ProStar, RXT, TranStar, WorkStar
Logical signal: Diff_Lock_Fwd_Solenoid_C md, MATV_Diff_Lock_Front_Sol _Cmd

Cause and when it sets

Cause: Current above normal or grounded circuit

What to do next

Read active and inactive codes with the OEM service tool (Diamond Logic Builder can clear previously active codes) and note the occurrence count.
FMI 6 tells the shop the type of failure to test for: current above normal or grounded circuit.
Have a heavy-duty diesel technician confirm the fault against the engine or chassis service manual before replacing parts.