2003 Ford F-350 P0603 and U0306 DTC Errors After Livewire TS Tuner Flash

Model: Ford F350 Fault Code: P0603 Posted: 2020-10-21 05:08

I recently purchased a 2003 Ford F-350 with the 6.0L V8 engine and installed a Livewire TS tuner. After updating the firmware and flashing the truck, I initially experienced no issues—everything ran smoothly for about three days. However, when I attempted to switch from off-road tuning to street mode, the tuner displayed an error '110DD' indicating a download failure. Upon checking the diagnostic trouble codes (DTCs), I found two errors: P0603 and U0306. The U0300 code specifically indicates software incompatibility with the Fuel Injector Control Module (FICM). This is puzzling because the tuner had previously flashed successfully six times without any issues. How can there be a compatibility failure now when it worked consistently before? I'm seeking advice on whether this is a known issue, if the FICM firmware needs updating, or if the Livewire TS software version might be incompatible with my 2003 F-350 model.