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Tahoe / Yukon Service Manual

DTC U3000 (K164 Differential Control Module)

Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC U3000 Control Module For symptom byte information, refer to Symptom Byte List. Circuit/System Description The internal fault detection is handled inside the control module. The symptom byte information is for engineering reference only. No external circuit diagnosis is involved. Conditions for Running the DTC The control module runs the program to detect an internal fault when power up is commanded. The only requirements are voltage and ground. Conditions for Setting the DTC The control module has detected an internal malfunction. Action Taken When the DTC Sets The control module refuses all additional inputs. Conditions for Clearing the DTC A current DTC will clear when the diagnostic runs and passes. A history DTC will clear after 100 consecutive malfunction-free ignition cycles. Diagnostic Aids This DTC may be stored as a history DTC without affecting the operation of the control module. If stored only as a history DTC and not retrieved as a current DTC, do not replace the control module. Reference Information Schematic Reference Data Communication Schematics Control Module References Connector End View Reference Master Electrical Component List Description and Operation Data Link Communications Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for scan tool information Circuit/System Verification

  1. Ignition ON/Vehicle In Service Mode, engine OFF.
  2. Perform Rear Differential Functional Test using the scan tool. ⇒ If Rear Differential Functional Test fails Diagnose DTCs. Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If Rear Differential Function Test passes
  3. Verify DTC U3000 is not set with symptom byte 49, 55 or 57. ⇒ If DTC U3000 is set with symptom byte 49, 55 or 57. 3.1. Perform all necessary programming and setup procedures for the K164 Differential Control Module. 3.2. Verify the DTC does not set. ⇒ If the DTC sets, replace K164 Differential Control Module. ⇓ If the DTC does not set 3.3. All OK. ⇓ If DTC U3000 is not set with symptom byte 49, 55 or 57.
  4. All OK Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification For control module replacement, programming, and setup refer to: Control Module References