International SA 33 SPN 1079 FMI 1: 5V Sensor Supply Below Normal Range

Code details

Manufacturer

International (Navistar)

Applies to

International / Navistar body controller (ESC) and multiplexed modules

Fault code

SA 33 SPN 1079 FMI 1

J1939 SPN

1079

FMI

1 — Data valid but below normal operating range (most severe)

Reporting module

Body Controller (source address 33)

Component / signal

Vref Sensor Supply Voltage

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

Switched_5V_Sense_Raw_ Signal

Cause and when it sets

Cause: Data valid but below normal operational range - most severe level

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 1 tells the shop the type of failure to test for: data valid but below normal operating range (most severe).
• Have a heavy-duty diesel technician confirm the fault against the engine or chassis service manual before replacing parts.

Related fault codes

• International SA 33 SPN 1079 FMI 0 — 5V Sensor Supply Above Normal Range
• Cummins Fault Code 352 — Sensor Supply Voltage #1 Circuit - shorted low
• Cummins Fault Code 386 — Sensor Supply Voltage #1 Circuit - shorted high