International SA 33 SPN 520806 FMI 6: Fifth Wheel Jaw Unlock Solenoid2 output Overcurrent

SA 33 SPN 520806 FMI 6 on International / Navistar trucks means: Fifth Wheel Jaw Unlock Solenoid2 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 520806 FMI 6
J1939 SPN: 520806
FMI: 6 — Current above normal or grounded circuit
Reporting module: Body Controller (source address 33)
Component / signal: Fifth Wheel Jaw Unlock Sol2 Command
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: Fifth_Wheel_Jaw_Unlock_S ol2_Cmd

Cause and when it sets

Cause: Short To Ground or Defective Solenoid

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.