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P1601 Diagnostic Trouble Code Discussion for December 2007

PCM Serial Communications Malfunction

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Trouble Ticket Help Requests for DTC P1601
Help Request Posted
1996 Pontiac Grand Am SE 2.4L MIL Lamp on VIN: 1G2NE12TXT
P1601: PCM Serial Communications Malfunction. ... with a p0440 and p1601. p0440 keeps comming back at first start up at idle or driving.i check both purge and vent solenoids,both are operating fine.pressure tested the system and held prssure good, no leaks at all. i can actuate the vent solenoid and apply...
December 18, 2007