The scanmaster software I have shows the following for code P1323:
Ford - Cylinder #11 High to Low Side Short
GM - ICM 24X Reference Circuit Low Frequency
Volkswagen - Knock Sensor 4 (G199), Signal too small
A further search showed a cause for the GM code above as follows:
DTC P0340 and P1376 not set, at least 7 CAM edges received this ignition cycle, at least
one CAM REF pulse received within the last 4 seconds, engine speed over 496 rpm, then
the PCM did not detect any 24X REF pulses (24X circuit was low for 4 seconds).
P0340 generic - Camshaft Position Sensor "A" circuit
P1376 GM - Ignition Ground Circuit
Not sure any of this has helped, I guess the code can mean different things for different manufacturers...
If it were me, I would perform a battery reset, then if the code came back, get it read by a dealer or indi.