Rich,
The P1378 DTC is a code that is generated by the ECM when the FICM relay is removed during programming. This is completely normal and will alleviate itself after several key cycles, or you may use the FICM programmer's Diagnostic functions to clear the DTC manually.
The U0306 DTC is a mismatch between the RCM and FICM strategies. This code is more of a reference code and is NOT an indication of anything that will affect driveability, so there is no real concern. In order to eliminate the DTC, you must use the correct FICM strategy with the correct ECM strategy. The relationship is as follows:
- 2003 Model Year:
ECM: VXAxxxx
FICM: 2003 FICM Strategy
- 2004 Model Year:
ECM: VXBxxxx
FICM: 2004 FICM Strategy
- 2005+ Model Year:
ECM: VXCxxxx
FICM: 2005+ FICM Strategy
In your situation where the truck was a 2004 but still ran the 2003 ECM strategies, you'll need to use the 2003 FICM strategies.
I hope this is helpful.
__________________
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