International SA 33 SPN 520653 FMI 2: High Current Load Switch Error

Code details

Manufacturer

International (Navistar)

Applies to

International / Navistar body controller (ESC) and multiplexed modules

Fault code

SA 33 SPN 520653 FMI 2

J1939 SPN

520653

FMI

2 — Data erratic, intermittent or incorrect

Reporting module

Body Controller (source address 33)

Component / signal

Auxiliary High Current Load Switch

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

High_Current_Load_Switch

Cause and when it sets

Cause: Data erratic, intermittent or incorrect

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 2 tells the shop the type of failure to test for: data erratic, intermittent or incorrect.
• Have a heavy-duty diesel technician confirm the fault against the engine or chassis service manual before replacing parts.