International Fault Code SPN 1072 FMI 3: Engine Compression Brake Output #1: Voltage Above Normal, Or Shorted To High Source

Code details

Manufacturer

International (Navistar)

Applies to

International A26 (2024–2025)

Fault code

SPN 1072 FMI 3

J1939 SPN

1072

FMI

3 — Voltage above normal, or shorted to high source

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 3 tells the shop the type of failure to test for: voltage above normal, or shorted to high source.
• Have a heavy-duty diesel technician confirm the fault against the engine or chassis service manual before replacing parts.

Related fault codes

• International Fault Code SPN 1072 FMI 4 — Engine Compression Brake Output #1: Voltage Below Normal, Or Shorted To Low Source
• International Fault Code SPN 1072 FMI 5 — Engine Compression Brake Output #1: Current Below Normal Or Open Circuit
• PACCAR Fault Code P3405 — MX Engine Brake Solenoid Valve Cylinder 1-3 – Current Too Low or Open Circuit on ECU (D420) Pin (A17)
• PACCAR Fault Code P3407 — MX Engine Brake Solenoid Valve Cylinder 1-3 – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (A17)
• PACCAR Fault Code P3408 — MX Engine Brake Solenoid Valve Cylinder 1-3 – Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (A17)
• PACCAR Fault Code P3445 — MX Engine Brake Solenoid Valve Cylinder 4-6 – Current Too Low or Open Circuit on ECU (D420) Pin (A20)
• PACCAR Fault Code P3447 — MX Engine Brake Solenoid Valve Cylinder 4-6 – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (A20)
• PACCAR Fault Code P3448 — MX Engine Brake Solenoid Valve Cylinder 4-6 – Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (A20)