error code A4 - COP Reset occurred

corrective actions and checks:
- check and clean static straps
- check for shorts to frame
- replace the firmware (eprom)
- install a replacement vehicle manager (the suspect vehicle manager must be returned to mfg for recalibration before it can be used)

i would make sure truck has static strap installed first
then isolate the battery away from the truck and see if code goes away.
if code persists check for shorts to frame in motors and other components.
last would be to replace the firmware or vehicle manager