International SA 33 SPN 168 FMI 4: DC Module Undervoltage condition on Vehicle DC Bus.

Code details

Manufacturer

International (Navistar)

Applies to

International / Navistar body controller (ESC) and multiplexed modules

Fault code

SA 33 SPN 168 FMI 4

J1939 SPN

168

FMI

4 — Voltage below normal, or shorted to low source

Reporting module

Body Controller (source address 33)

Component / signal

Electrical Potential (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

Cause and when it sets

Cause: An Under Voltage Condition in the DC regulator (Vehicle Battery Bus).

A Low Battery Cutout fault has occurred and the source of the fault is the DC regulator (Vehicle Battery Bus).

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 4 tells the shop the type of failure to test for: voltage below normal, or shorted to low source.
• 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 168 FMI 4 — AC Module Undervoltage condition on High Voltage DC Bus.
• International SA 33 SPN 168 FMI 2 — Comm. fault from ESC/BC to PP3.
• International SA 33 SPN 168 FMI 3 — DC Module Overvoltage condition on Vehicle DC Bus.
• International SA 33 SPN 168 FMI 3 — AC Module Overvoltage condition on High Voltage DC Bus.
• International SA 33 SPN 168 FMI 6 — AC Module has shutdown due to overload condition.
• International SA 33 SPN 168 FMI 8 — Phase missing fault/alternator fault.
• International SA 33 SPN 168 FMI 16 — DC module over temperature condition.
• International SA 33 SPN 168 FMI 16 — AC module over temperature condition.