Diagnostic Overview
SPN 7107 is an incomplete SPN-only entry in the derate category because no FMI was provided. It should be treated as a derate-related diagnostic indicator that requires the complete SPN/FMI and PACCAR MX service information before a precise fault definition can be assigned. On PACCAR MX engines, confirm the exact definition with DAVIE4, the engine serial number, emissions year, and current calibration because code meanings and troubleshooting trees can vary.
Likely Causes
Missing FMI; derate or inducement status; related aftertreatment fault; communication issue; calibration-specific diagnostic condition.
What To Check First
Retrieve the full SPN/FMI with DAVIE4, review all related active codes, check freeze-frame data, and diagnose the root cause before clearing or resetting derate status.