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Tahoe / Yukon Service Manual

DTC C1167

Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptor DTC C1167 Differential Lock Motor Brake Actuator Circuit/System Description Differential control module is supplying voltage to the rear differential lock motor brake actuator and is grounded through the control module. Conditions for Running the DTC Ignition ON. System voltage is between 9–16 V. Operation requested Conditions for Setting the DTC The K164 Differential Control Module detects the motor brake slips more than 255 times in one ignition cycle. Action Taken When the DTC Sets One or more of the following actions may occur: System is disabled — clutch open SERVICE REAR AXLE message is displayed in the Driver Information Center. Conditions for Clearing the DTC A current DTC clears on the following key cycle after the malfunction is no longer present. A history DTC clears when the device ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction. Reference Information Schematic Reference Differential Lock Schematics Connector End View Reference Master Electrical Component List Description and Operation Rear Drive Axle Description and Operation Electrical Information Reference Circuit Testing Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for scan tool information

  1. Verify there are no other DTCs set. ⇒ If any other DTCs are set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If no other DTCs are set
  2. Check for updated software in K164 Differential Control Module. ⇒ If software is not current 2.1. Perform programming and learn procedure for the K164 Differential Control Module. 2.2. Verify DTC does not reset. ⇒ If the DTC sets Replace the M135 Differential Lock Motor. ⇓ If the DTC does not set 2.3. All OK. ⇓ If software is up to date
  3. Replace the M135 Differential Lock Motor. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Limited Slip Differential Clutch Motor Replacement Control Module References for rear differential clutch control module replacement, programming, and setup.