Pinpoint Test I : U0140: Notes
WARNING: This page is about a different car, the 2020 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 the DTC U0140 when key messages are not received from the BCM for longer than 90 seconds. This loss of key messages degrades the 4X4 system functionality. Other modules that require data from the BCM module all set communication DTCs and may also exhibit system function concerns.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0140 | Lost Communication With Body Control Module (BCM): No Sub Type Information | Sets in continuous memory in the TCCM if BCM data messages received from the BCM over the HS-CAN are missing for longer than 90 seconds. |
Possible Sources
- Communication concern
- Battery voltage concern
- BCM module
- TCCM