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Tahoe / Yukon Service Manual

DTC C1146

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 Descriptors DTC C1146 Power Steering Motor Circuit Malfunction Symptom Byte Information: Symptom Byte List Circuit/System Description The power steering control module continuously monitors the voltage and current levels being commanded to the 3-phase steering assist motor. The power steering control module compares the desired and actual current levels to detect malfunctions in the internal power steering assist motor circuits. Conditions for Running the DTC Ignition ON. Conditions for Setting the DTC The power steering control module detects a short to ground, short to voltage, or an open/high resistance on any of the internal power steering assist motor circuits. Action Taken When the DTC Sets The DTC is stored in memory. No steering assist. Conditions for Clearing the DTC A history DTC will clear after 40 consecutive malfunction free ignition cycles. 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 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. Verify that DTC C1146 is not set. ⇒ If the DTC is set Replace the K43 Power Steering Control Module . ⇓ If the DTC is not set
  2. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Control Module References for power steering control module programming and setup.