Fault Code Descriptions
a MIL (FMEM) illuminates after first fault (Federal calibration only).
b MIL (OBDII) illuminates after second consecutive fault.
c Neutral switch for F650/F750 with Allison AT545 auto transmission.
d Transmission control indicator (TCIL) flashes when fault is present.
e F-Series 650/750 with Allison AT545 automatic transmission.
PCED=Powertrain Control/Emissions Diagnosis Manual.