International SA 58 SPN 520808 FMI 14: No-Idle Compressor Relay open circuit or shorted circuit

SA 58 SPN 520808 FMI 14 on International / Navistar trucks means: No-Idle Compressor Relay open circuit or shorted circuit. The failure mode (FMI 14) is “special instructions”.

Code details

Manufacturer: International (Navistar)
Applies to: International / Navistar body controller (ESC) and multiplexed modules
Fault code: SA 58 SPN 520808 FMI 14
J1939 SPN: 520808
FMI: 14 — Special instructions
Reporting module: Rear HVAC (source address 58)
Component / signal: No-Idle Compressor Relay
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

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 14 tells the shop the type of failure to test for: special instructions.
Have a heavy-duty diesel technician confirm the fault against the engine or chassis service manual before replacing parts.