Pinpoint Test K : U0140, U0141
- Refer to Module Communications Network
for schematic and connector information.
Normal Operation and Fault Conditions
When a network message is suspected as missing or confirmed by a missing message DTC (U-code), its important to look for other conditions that may also be present in additional modules throughout the vehicle. Once a DTC sets in the TCM, it may be helpful to review the complete message list available in the Master DTC Chart and see what other modules also rely on the same message and run the self-test for those modules. If the message is missing from other modules, the same DTC may also set in those modules. Confirmation of missing messages common to multiple modules may indicate that the originating module is the source of the concern or the communication network may be experiencing some problems.
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition TCM U0140:00 Lost Communication With Body Control Module: No Sub Type Information Currently the calibration is not available. TCM U0141:00 Lost Communication With Body Control Module "A": No Sub Type Information Currently the calibration is not available. Possible Sources
- Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
- Fuse
- Network
- K1 READ AND RECORD ALL DTCS
- Using the diagnostic scan tool, retrieve all DTCs.
Are DTCs U0140 and/or U0141 present?
Yes GO to K2 No The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition. - K2 CHECK FOR CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)
- Using the diagnostic scan tool, retrieve all CMDTCs.
Is DTC U3003:16 or U3003:17 present?
Yes REFER to: Anti-Lock Brake System (ABS) And Stability Control . No GO to K3 - K3 CHECK THE COMMUNICATION NETWORK
- Ignition ON.
- Carry out the network test.
Does the BCM pass the network test?
Yes GO to K4 No REFER to: Communications Network . - K4 CHECK FOR DIAGNOSTIC TROUBLE CODE (DTC) U0140 AND/OR U0141 SET IN OTHER MODULES
- Using the diagnostic scan tool, retrieve all CMDTCs.
Are DTCs U0140 and/or U0141 present in other modules?
Yes Refer to BCM Guided Routine Testing . No The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.