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P1601 Diagnostic Trouble Code Discussion for December 2010

PCM Serial Communications Malfunction

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Trouble Ticket Help Requests for DTC P1601
Help Request Posted
1996 Pontiac Sunfire SE 2.2L No Start VIN: 3G2JB1248T
P1601: Loss of serial communication. ... no start. He had already replaced plugs wires coils etc.I Scanned and found invalid key code. installed new passlock & tumbler all was good. Next morning get call that car will not start. Towed it in and right away noticed all dash idiot lights stay on...
December 10, 2010