J1939 SPN 3174 — Body/Chassis parameter

What it means

J1939 Aftertreatment 1 SCR Intermediate Gas Temperature or general Body/Chassis data link communication error. Note: While SPN 3174 is often categorized under Body/Chassis, on some engine platforms (like Cummins/PACCAR), it specifically refers to an SCR Intermediate Gas Temperature sensor circuit high/low. This diagnosis assumes the J1939 communication context requested.