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U0401 Diagnostic Trouble Code Discussion for March 2017

Implausible Data Received From ECM / PCM


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Trouble Ticket Help Requests for DTC U0401
Help Request Posted
2013 Lincoln MKZ 2.0L MIL Lamp on, Cooling fans on VIN: 3LN6L2G94D
U0401: Invalid data recieved from the PCM. Hello fellow iATN members! Today I ask for some serious technical help. This MKZ has the most peculiar problem. The original complain is that the cooling fans stay running all of the time. Using the IDS I found that the AC pressure was at 399 psi, sensor readi...
March 29, 2017