International Fault Code SPN 173 FMI 2: EGT Signal – Erratic, Intermittent, or Incorrect

Code details

Manufacturer

International (Navistar)

Applies to

International MaxxForce DT (2010–2019)

Fault code

SPN 173 FMI 2

J1939 SPN

173

FMI

2 — Data erratic, intermittent or incorrect

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 2 tells the shop the type of failure to test for: data erratic, intermittent or incorrect.
• 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 173 FMI 2 — Engine Exhaust Temperature: Data Erratic, Intermittent Or Incorrect
• International Fault Code SPN 173 FMI 3 — EGT Signal – Out of Range HIGH
• International Fault Code SPN 173 FMI 4 — EGT Signal – Out of Range LOW
• International Fault Code SPN 173 FMI 3 — Engine Exhaust Temperature: Voltage Above Normal, Or Shorted To High Source
• International Fault Code SPN 173 FMI 4 — Engine Exhaust Temperature: Voltage Below Normal, Or Shorted To Low Source
• PACCAR Fault Code P102A — Exhaust Gas Temperature After BPV – Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (C11)
• PACCAR Fault Code P102B — Exhaust Gas Temperature After BPV – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (C11)
• PACCAR Fault Code P103B — PTO Status Switch – Data Erratic, Intermittent or Incorrect