Originally Posted by toobadq
What, other than lost voltage to Pcm can set this code? Other than his powermod.
if it is a 603, it could be faulty wiring or a bad pcm...both could cause a voltage loss to the pcm (on the constant hot wire), but many trans codes are stored in KAM, along with certain engine hard faults. depending on the fault, it can be stored as an event and not even turn the CEL on, stored as a hard fault, turn the light on, or be a KAM code which is only cleared after the code is fixed and the event does not happen for a certain amount of drive cycles. trans codes are very prone to this. when the PCM sees a trans code that could potentially result in a harmfull event, most OBDII systems set a KAM code which the PCM uses to minimize the potential hazard. in the event of a total trans failure for example, the PCM would first see an overheat, and try to lower trans pressures (just an example, its all more complicated than this) to minimize negative effects and possibly save things if its lets say, just a plugged cooler causing the overheat. by reducing the amount of heat the trans can build, the pcm has a stratagy to possibly save it if its not the causual part. untill the PCM recognizes that the hazard is not there, the KAM code will stay. the reason i brought up the possibility was because he specifially said he had a trans issue.....which is why i wanted the code.