International Fault Code SPN 4766 FMI 10: Catalyst System Efficiency Below Threshold

Code details

Manufacturer

International (Navistar)

Applies to

International MaxxForce DT (2010–2019)

Fault code

SPN 4766 FMI 10

J1939 SPN

4766

FMI

10 — Abnormal rate of change

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 10 tells the shop the type of failure to test for: abnormal rate of change.
• Have a heavy-duty diesel technician confirm the fault against the engine or chassis service manual before replacing parts.

Related fault codes

• PACCAR Fault Code P3753 — Exhaust Gas Temperature Before DPF – Voltage Too High or Short Circuit to Supply
• PACCAR Fault Code P3754 — Exhaust Gas Temperature Before DPF – Voltage Too Low or Short Circuit to Ground
• PACCAR Fault Code P3755 — Exhaust Gas Temperature Before DPF – Data Erratic, Intermittent, or Incorrect, Not Changing During Operation
• PACCAR Fault Code P3779 — Exhaust Gas Temperature Before DPF – Data Valid But Too High, Least Severe
• PACCAR Fault Code P3780 — Exhaust Gas Temperature Before DPF – Data Valid But Too High, Most Severe
• PACCAR Fault Code P3782 — Exhaust Gas Temperature Before DPF – Data Valid But Too High, Moderately Severe
• PACCAR Fault Code P3783 — Diesel Oxidation Catalyst (DOC) – Data Valid But Too High, Moderately Severe