International Fault Code SPN 84 FMI 1: Wheel-Based Vehicle Speed: Data Valid But Below Normal Operational Range – Most Severe Level

Code details

Manufacturer

International (Navistar)

Applies to

International A26 (2024–2025)

Fault code

SPN 84 FMI 1

J1939 SPN

84

FMI

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

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 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 84 FMI 9 — Missing Wheel Based Vehicle Speed Message
• International Fault Code SPN 84 FMI 0 — Wheel-Based Vehicle Speed: Data Valid But Above Normal Operational Range – Most Severe Level
• International Fault Code SPN 84 FMI 15 — Wheel-Based Vehicle Speed: Data Valid But Above Normal Operating Range – Least Severe Level
• International Fault Code SPN 84 FMI 3 — Wheel-Based Vehicle Speed: Voltage Above Normal, Or Shorted To High Source
• International Fault Code SPN 84 FMI 4 — Wheel-Based Vehicle Speed: Voltage Below Normal, Or Shorted To Low Source
• PACCAR Fault Code P0502 — Vehicle Speed Sensor – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (B40)
• PACCAR Fault Code P0503 — Vehicle Speed Sensor – Out of Range
• PACCAR Fault Code P1501 — Vehicle Speed Sensor – Current Too Low or Open Circuit on ECU (D420) Pin (B40)