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P1309 Diagnostic Trouble Code Discussion for October 2008

Misfire Detection Monitor

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Trouble Ticket Help Requests for DTC P1309
Help Request Posted
2001 Ford Expedition XLT 5.4L MIL Lamp on VIN: 1FMPU16L31
P1309: Misfire Monitor Disabled Possible cmp pcm RFI. ... CMP's and Connectors replaced to fight a P0340 Loss of CMP signal. Went from 26K to 44K without much incident. At 44K PCM freaked out causing radical engine and instrument behavior. Replaced PCM all symptoms went away. 2 weeks later, P1309(Misfire monitor ...
October 29, 2008