U0101–LOST COMMUNICATION WITH TCM

For a complete wiring diagram Refer to Section 8W.


  • When Monitored:
    • With the ignition on
    • Battery voltage between 10 and 16 volts
    • IOD fuse installed
  • Set Condition:

    If the Anti-Lock Brakes Module fails to receive bus messages from the TCM for approximately 500 ms.


Possible Causes
  
DTCs RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
  
CAN C BUS CIRCUITS OPEN OR SHORTED
  
TCM POWER AND GROUND
  
PCM DTCs PRESENT
  
TCM
  
ANTI-LOCK BRAKES MODULE
  



Diagnostic Test

1.VERIFY DTC IS ACTIVE

NOTE: Verify the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

NOTE: If present, diagnose and repair DTC U0002–CAN C BUS OFF PERFORMANCE, DTC or DTC U1502–IMPLAUSIBLE MESSAGE DATA LENGTH RECEIVED FROM FCM / TIPM before diagnosing this DTC.









Does this DTC reset?

Yes
  • Go To 2


No

2.CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCs


NOTE: Check for CAN C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.



Does the scan tool display any active DTCs related to the conditions listed above?

Yes
  • Diagnose and repair the DTC(s). Refer to the Table of Contents in the applicable Section.


No
  • Go To 3

3.VERIFY THAT THE TCM IS ACTIVE ON THE BUS




Is the TCM active on the bus?

Yes
  • Go To 4


No

4.CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCs



Is there more than one module with active DTCs “Logged Against” the TCM?

Yes


No