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Tahoe / Yukon Service Manual

DTC C116A

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 C116A Power Steering Malfunction Level 3 Circuit/System Description The power steering system contains redundant torque and steering angle sensors in order to limit situations where total loss of assist occur. If a malfunction occurs in only one of the two sensors, the power steering system will continue to provide steering assist. Conditions for Running the DTC Ignition ON, Engine Running. Power steering system voltage is 6–16 V. Conditions for Setting the DTC A hardware fault in one of the two torque and/or steering angle sensors is detected. Action Taken When the DTC Sets The driver information center displays the SERVICE POWER STEERING NO ASSIST warning message. Conditions for Clearing the DTC The DTC will move to history when the root cause is fixed. A history DTC will clear after 40 consecutive malfunction-free ignition cycles. Diagnostic Aids This DTC is indicative that the vehicle is in a Limp Home mode. It does not indicate the specific failure and should be set along with another electronic power steering DTC. Reference Information Schematic Reference Power Steering Schematics Connector End View Reference Master Electrical Component List Description and Operation Power Steering System 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. Circuit/System Verification

  1. Ignition ON.
  2. Verify that DTC C116A is not set. ⇒ If the DTC C116A is set Diagnose the root cause power steering malfunction. Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If the DTC C116A is not set
  3. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Control Module References for control module replacement, programming and setup.