Pinpoint Test C : DTC U0155
WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
- C1 CHECK THE COMMUNICATION NETWORK
- Ignition ON.
- Using the diagnostic scan tool, perform the network test.
Does the IPC module pass the network test?
Yes GO to C2 No To diagnose the module does not respond to the scan tool, REFER to: Communications Network . - C2 CHECK FOR GSM (GEAR SHIFT MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
- Clear all DTCs.
- Using the diagnostic scan tool, perform the GSM self-test.
Is DTC U0155 present?
Yes GO to C3 No The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition. - C3 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE GSM (GEAR SHIFT MODULE) SELF-TEST
- Check for DTCs from the self-test.
Are any GSM DTCs present?
Yes REFER to the GSM DTC chart and diagnose those DTCs first. No GO to C4 - C4 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST
- Check for DTCs from the self-test.
Is DTC U3000:49 present?
Yes REFER to: Instrumentation, Message Center and Warning Chimes . REFER to: Instrumentation, Message Center and Warning Chimes - Vehicles With: Head Up Display (HUD) . No GO to C5 - C5 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0155 SET IN OTHER MODULES
- Using the diagnostic scan tool, perform the self-test for all modules.
- Retrieve the DTCs from all modules.
Is DTC U0155 present in the PCM or SCCM?
Yes CHECK OASIS for any applicable service articles: TSB, GSB (general service bulletin), SSM (special service message) or FSA (Field Service Action). If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new IPC. Refer to IPC GUIDED ROUTINE TESTING -- NAVIGATOR . No If the reporting module is the GSM, INSTALL a new GSM. REFER to: Gear Shift Module (GSM) .