Pinpoint Test I : U0100: 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 U0100 when it has not received messages from the PCM for more than 5 seconds. Other modules that require data from the PCM all set communication DTCs and may also exhibit system function concerns.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0100 | Lost Communication With ECM/PCM "A": No Sub-Type Information | Sets in continuous memory in the TCCM if powertrain data messages received from the PCM over the HS-CAN are missing for longer than 5 seconds. |
Possible Sources
- Communication concern
- Battery voltage concern
- PCM
- TCCM