International Fault Code SPN 91 FMI 4: Accelerator Pedal Position 1: Voltage Below Normal, Or Shorted To Low Source

Code details

Manufacturer

International (Navistar)

Applies to

International A26 (2024–2025)

Fault code

SPN 91 FMI 4

J1939 SPN

91

FMI

4 — Voltage below normal, or shorted to low 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 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 Fault Code SPN 91 FMI 4 — APP1 Signal – Out of Range LOW
• International Fault Code SPN 91 FMI 2 — APP1 and APP2 Signal Conflict
• International Fault Code SPN 91 FMI 3 — APP1 Signal – Out of Range HIGH
• International Fault Code SPN 91 FMI 2 — Accelerator Pedal Position 1: Data Erratic, Intermittent Or Incorrect
• International Fault Code SPN 91 FMI 3 — Accelerator Pedal Position 1: Voltage Above Normal, Or Shorted To High Source
• Cummins Fault Code 287 — SAE J1939 Multiplexing Accelerator Pedal Sensor System Error
• Cummins Fault Code 431 — Accelerator Pedal Idle Validation Circuit - data incorrect
• Cummins Fault Code 432 — Accelerator Pedal Idle Validation Circuit - out of calibration