International Fault Code SPN 3031 FMI 20: Aftertreatment 1 Diesel Exhaust Fluid Tank Temperature 1: Data Drifted High

Code details

Manufacturer

International (Navistar)

Applies to

International A26 (2024–2025)

Fault code

SPN 3031 FMI 20

J1939 SPN

3031

FMI

20

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 20 tells the shop the type of failure to test for: .
• 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 3031 FMI 13 — Aftertreatment 1 Diesel Exhaust Fluid Tank Temperature 1: Out Of Calibration
• International Fault Code SPN 3031 FMI 2 — Aftertreatment 1 Diesel Exhaust Fluid Tank Temperature 1: Data Erratic, Intermittent Or Incorrect
• International Fault Code SPN 3031 FMI 3 — Aftertreatment 1 Diesel Exhaust Fluid Tank Temperature 1: Voltage Above Normal, Or Shorted To High Source
• International Fault Code SPN 3031 FMI 4 — Aftertreatment 1 Diesel Exhaust Fluid Tank Temperature 1: Voltage Below Normal, Or Shorted To Low Source
• PACCAR Fault Code P3895 — DEF Tank Temperature Sensor – Short Circuit to Supply or Open Circuit
• PACCAR Fault Code P3899 — DEF Tank Temperature – Data Erratic, Intermittent or Incorrect
• PACCAR Fault Code P3900 — DEF Tank Temperature Sensor – Voltage Too Low or Short Circuit to Ground