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Possible Causes

  1. I1: CHECK THE COMMUNICATION NETWORK 
    • Ignition ON, engine OFF.
    • Press the Read Vehicle Information button to view the results of the modules communicating on the network.
    • Retrieve the continuous memory DTCs.
    • Does the TCM pass the Network Test? 
      Yes No
      RETRIEVE and RECORD all TCM DTCs. REFER to the Automatic Transmission article. If there are no DTCs in the TCM,
      Go to  I3.      		 Go to  I2.
  2. I2: CHECK THE GWM COMMUNICATION 
    • Review the results of the modules communicating on the network from the previous step.
    • Did the GWM pass the Network Test? 
      Yes No
      DIAGNOSE the TCM does not communicate with the diagnostic scan tool. REFER to the Module Communications Network article. DIAGNOSE the scan tool does not communicate with the GWM. REFER to the Module Communications Network article.
  3. I3: RECHECK THE ABS MODULE FOR THE LOST COMMUNCATION DTC 
    • Clear the ABS DTCs.
    • Ignition OFF.
    • Ignition ON, engine OFF.

      Carry out the ABS self-test.

    • Are any of the DTCs listed in the DTC Fault Trigger Conditions table present and active in the ABS module? 
      Yes No
      Go to  I4. The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
  4. I4: REVIEW THE ABS MODULE SELF-TEST FOR VOLTAGE-REALTED DTCS 
    • Review the results from the ABS module self-test.
    • Is DTC U3003:16 or U3003:17 present? 
      Yes No
      For DTC U3003:16, GO to PINPOINT TEST A .
      For DTC U3003:17, GO to PINPOINT TEST F .      		 Go to  I5.
  5. I5: CHECK FOR GWM DTCS 

    Carry out the GWM self-test.

    • Are any DTCs present? 
      Yes No
      DIAGNOSE the GWM DTC. REFER to the Module Communications Network article. Go to  I6.
  6. I6: CHECK FOR TCM DTCS 

    Carry out the TCM KOEO self-test.

    • Are any DTCs present? 
      Yes No
      DIAGNOSE the TCM DTC. REFER to the appropriate Electronic Engine Controls article. Go to  I7.
  7. I7: CHECK FOR OTHER CAUSES OF COMMUNICATION NETWORK CONCERN 
    NOTE: If new modules were installed prior to the DTC being set, the module configuration can be incorrectly set during the PMI or the PMI may not have been carried out.
    • Check the vehicle service history for recent service actions related to the TCM or the ABS module. If recent service history is found:
      • Verify the correct replacement module was installed. HVBOM may be used to verify correct part fitment.
      • Verify the configuration of replacement module was correct. Re-configure the module using as-built data if prior configuration is suspect.
      • Verify the module was not obtained from a like vehicle and installed into customer vehicle. Return the swapped module to source vehicle and obtain new replacement module.
    • Operate the system and determine if the observable symptom is still present.
    • Is the observable symptom still present? 
      Yes No
      Go to  I8. The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.
  8. I8: CHECK FOR COMMUNICATION DTCS IN OTHER MODULES 
    • Ignition ON, engine OFF.
    • Retrieve the continuous memory DTCs.
    • Is any DTC U0101:xx or U0402:xx set in 1 or more modules in addition to the ABS module? 
      Yes No
      Go to  I9. Go to  I10.
  9. I9: VERIFY PCM OPERATION 
    • Ignition OFF.
  10. I10: VERIFY ABS MODULE OPERATION 
    • Ignition OFF.
    • ABS Module connector disconnected.
    • GWM connector disconnected. (C2431)
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