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Pinpoint Test P : DTC U0101: Notes

WARNING: This page is about a different car, the 2017 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Refer to Two Wheel Drive/Four Wheel Drive Systems for schematic and connector information.

Normal Operation 

The TCCM sets DTC U0101 when it has not received messages from the TCM for more than 5 seconds with ignition in RUN and battery voltage in range. Other modules that require data from the TCM all set communication DTCs and may also exhibit system function concerns.

DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
U0101 Lost Communication With TCM "A": No Sub-Type Information Sets in continuous memory in the TCCM if powertrain data messages received from the TCM over the HS-CAN are missing for longer than 5 seconds with ignition in RUN and battery voltage in range.

Possible Sources 

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