International Fault Code SPN 4374 SPN 31: Aftertreatment 1 Diesel Exhaust Fluid Pump 1 Motor Speed : Condition Exists

Code details

Manufacturer

International (Navistar)

Applies to

International A26 (2024–2025)

Fault code

SPN 4374 SPN 31

J1939 SPN

4374

FMI

31 — Condition exists

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 31 tells the shop the type of failure to test for: condition exists.
• 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 4374 FMI 10 — Aftertreatment 1 Diesel Exhaust Fluid Pump 1 Motor Speed: Abnormal Rate Of Change
• International Fault Code SPN 4374 FMI 2 — Aftertreatment 1 Diesel Exhaust Fluid Pump 1 Motor Speed: Data Erratic, Intermittent Or Incorrect
• International Fault Code SPN 4374 SPN 20 — Aftertreatment 1 Diesel Exhaust Fluid Pump 1 Motor Speed : Data Drifted High