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Message: <blockquote data-quote="Foxmoto28" data-source="post: 1423839" data-attributes="member: 17570">Got a 200A alt because I am running electronics: HID system (theretrofitsource.com) and subwoofer (not crazy system but not stock either) and did it for insurance purposes along with doing a Big 3 upgrade (cables).     So I replaced that ground with #2 welding wire, crimped and soldered terminals. (battery was fully disconnected).Went to drive it home and had to immediately turn back. Got maybe 3 houses away.  Received codes:KOEO: 111-System checks OK (cooling fans)10/-Signals to full throttle542-FP open, bad ground or always on543-FPM circuit shows no power&KOER:177- O2 sensor not switching-Left rich542-FP open, bad ground or always on543-FPM circuit shows no power  Cleaned and checked connections, no change. Replaced both O2 sensors, CCRM no change.No apparent damage to wiring or pins to O2, CCRM, or PCM.  Starts and idles fine, when I drive it I can get maybe 4 houses away before it starts to sputter and jerk. Flooring it will get me there but has horrible return idle/speed.Battery, cables and terminals are all new and clean. All ground locations are clean and tight.  Now I cannot pull codes after the car is at normal operating temperature. Scanner will connect to system but will not self test/do anything to engine.Removed PCM and did a visual check inside. No apparent breaks in board.Did I fry my PCM somehow?</blockquote>