Pinpoint Test H : DTC U0100
WARNING: This page is about a different variant/trim than selected.
- Refer to Module Communications Network
for schematic and connector information.
Normal Operation and Fault Conditions
The GSM and TRCM use information contained in messages from the PCM sent on the HS-CAN.
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition GSM U0100:00 Lost Communication With ECM/PCM "A": No Sub Type Information This DTC sets if the GSM and/or TRCM does not receive some or all of an expected message from the PCM. Possible Sources
- Connectors damaged or pushed-out terminals, circuitry open, shorted to power or shorted to ground
- PCM
- H1 CHECK THE COMMUNICATION NETWORK
- Ignition ON.
- Using the diagnostic scan tool, perform the network test.
Does the PCM pass the network test?
Yes For GSM, GO to H2 For TRCM, GO to H4 No To diagnose the module does not respond to the scan tool, REFER to: Communications Network . - H2 CHECK FOR GSM (GEAR SHIFT MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)NOTE: If a GSM self-test is performed, the driver door must be closed and locked. A false P166B and/or P081F DTC sets if the driver door is opened or unlocked during the self-test.
- Clear all DTCs.
- Using the diagnostic scan tool, perform the GSM self-test.
Is DTC U0100 present?
Yes GO to H3 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. - H3 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE GSM (GEAR SHIFT MODULE) SELF-TEST
- Check for DTCs from the self-test.
Are any non-network GSM DTCs present?
Yes REFER to DTC Chart - GSM and diagnose those DTCs first. No GO to H6 - H4 CHECK FOR TRCM (TRANSMISSION RANGE CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
- Clear all DTCs.
- Using the diagnostic scan tool, perform the TRCM self-test.
Is DTCs U0100 present?
Yes GO to H5 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. - H5 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE TRCM (TRANSMISSION RANGE CONTROL MODULE) SELF-TEST
- Check for DTCs from the self-test.
Are any non-network TRCM DTCs present?
Yes REFER to DTC Chart - TRCM and diagnose those DTCs first. No GO to H6 - H6 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE PCM (POWERTRAIN CONTROL MODULE) SELF-TEST
- Using the diagnostic scan tool, perform the PCM self-test.
- Check for DTCs from the self-test.
Are DTCs P0562, P0563 and/or P1397 present?
Yes RESOLVE those DTCs first. For 1.5L, Refer to Electronic Engine Controls . For 2.0L, REFER to: Electronic Engine Controls . For 2.5L REFER to: Electronic Engine Controls . No GO to H7 - H7 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0100 SET IN OTHER MODULES
- Using the diagnostic scan tool, perform the self-test for all modules.
- Retrieve the DTCs from all modules.
Is DTC U0100 present in the ABS or IPC modules?
Yes CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, discontinue this test and follow TSB instructions. If no TSBs address this concern, Refer to PCM Guided Routine Testing . PERFORM the Transmission Strategy Download procedure. REFER to: Transmission Strategy Download . No If the reporting module is the GSM, INSTALL a new GSM. REFER to: Gear Shift Module (GSM) . If the reporting module is the TRCM, INSTALL a new TRCM. REFER to: Transmission Range Control Module (TRCM) .