U300A · Communications du constructeur

RAM · 2025-05-07

Diagnostic Trouble Code (DTC) U300A-29

RAM · 2025-03-26

"Base led headlamp RT 25 MY HDCC Ignition DTC (U300A-29 Ignition Switch - Signal Invalid) in stored state for SLML and SLMR. All headlamps on the Heavy Duty with SW 24.43.00(Premium) or 24.44.00(Base) will show a U300A-29 -> Ignition Switch-Signal Invalid as a stored DTC. If you experience this condition, please clear the DTCs on SLML and SLMR once and restart the truck and check if the DTC is in active state 10 seconds after the engine is turned ON, check the hardware ignition line and repair as required. If the DTC reappears as stored DTC (See Figure 1), no repair is required. The headlamps are good. The DTCs will appear every time the Ignition is cycled, and should be ignored."

FORD · 2024-06-07

Some 2023-2024 F-Super Duty vehicles equipped with a keyed ignition may exhibit a "Vehicle May Not Start/Restart Service Now" message in the instrument panel cluster (IPC) with diagnostic trouble code (DTC) U300A:01 stored in the body control module (BCM). This may be due to an obstruction of the ignition key due to a mispositioned grommet around the ignition lock cylinder. To correct this condition, reseat the grommet. This may require full or partial removal of the center instrument panel trim which the grommet seats into. Refer to Workshop Manual (WSM), Section 501-12. Once complete, make sure there is no restriction to movement and retest. If the condition persists, refer to normal diagnostics in WSM, Section 211-05.