Pinpoint Test L : DTC U0155
- 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 U0155:00 Lost Communication With Instrument Panel Cluster (IPC) Control Module: No Sub Type Information Lost communication with IPC module. Possible Sources
- L1 READ AND RECORD ALL DTCS
- Using the diagnostic scan tool, retrieve all DTCs.
Is DTC U0155 present?
Yes GO to L2 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. - L2 CHECK FOR CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)
- Using the diagnostic scan tool, retrieve all CMDTCs.
Is DTC U3006:16 or U3006:17 present?
Yes REFER to: Anti-Lock Brake System (ABS) And Stability Control . No GO to L3 - L3 CHECK THE COMMUNICATION NETWORK
- Ignition ON.
- Carry out the network test.
Does the IPC module pass the network test?
Yes GO to L4 No REFER to: Communications Network . - L4 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0155 SET IN OTHER MODULES
- Using the diagnostic scan tool, retrieve all CMDTCs.
Is DTC U0155 present in other modules?
Yes Refer to IPC 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.