And did you try to start with shift lever in 1st instead of D?
No code means that no electrical faults or monitored faults are present. On the 5-45RFE transmission it can also show slipping clutches, but i donīt think that this is monitored on the 42RE.
JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.