I would start with a battery disconnect for 5 minutes and see if that would make any difference. The codes will be reset and you can see if the same will come back. When no cure, try the calibration as mentioned at the above site. Let us know how it went.
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.