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Tahoe / Yukon Service Manual

DTC C0051

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 C0051 Steering Wheel Angle Sensor Signal Symptom Byte Information: Symptom Byte List Circuit/System Description For an overview of the component/system, refer to: ABS Description and Operation

Component Description
K43 Power Steering Control Module Steering shaft torque and position sensors inside the control module measure the input from the driver. The electric power steering motor amplifies the torque that the driver applies to the steering wheel.
K160 Brake System Control Module The control module K160 can increase and decrease the brake pressure on all 4 wheels individually in order to fulfill these functions: Antilock Braking Traction Control Vehicle Stability Control The control module K160 can also influence the following control modules to limit the amount of produced torque: K20 Engine Control Module K71 Transmission Control Module

Conditions for Running the DTC Ignition » On / Vehicle » In Service Mode Ensure the steering wheel and the front wheels are in the straight ahead position. Conditions for Setting the DTC C0051 0F Steering Wheel Angle Rate of Change Sensor Circuit = Greater than 30° C0051 19 1A Steering Wheel Angle Sensor Signal = Greater than the maximum threshold C0051 4B Steering Wheel Angle Sensor Signal = Not Learned C0051 5A Steering Angle Sensor = Not Plausible Actions Taken When the DTC Sets A message and/or warning indicator may be displayed to the driver. Conditions for Clearing the DTC The conditions for setting the DTC no longer exist. A history DTC will clear after 40 consecutive malfunction-free ignition cycles. Diagnostic Aids Check the tire inflation pressure and adjust to the tire inflation specifications as necessary. The vehicle should not pull in either direction causing the steering wheel to be off center while driving in a straight line on a level. Confirm that all tires are of the proper size and the same model and brand. If a mis-sized or non-matching tire model is present, inform the customer that in order for the vehicle stability system to function normally, tires need to have a uniform size and rolling diameter. Inspect the serial data circuits and connections at the power steering control module and the electronic brake control module. They should be free from sources of electromagnetic interference and the connections should be clean and tight. Reference Information Schematic Reference Antilock Brake System Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References Circuit/System Verification

  1. Ignition » On / Vehicle » In Service Mode
  2. Verify there are no DTCs set related to the following component/system: K43 Power Steering Control Module ⇒ If any of the DTCs are set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If none of the DTCs are set
  3. Perform the scan tool learn/reset function: Steering Wheel Angle Sensor Centering
  4. Verify that no DTCs are set. ⇒ If any DTC is set 4.1. Replace the component: Steering Gear 4.2. Verify that no DTCs are set. ⇒ If the DTC sets » Replace the component: K160 Brake System Control Module ⇓ If the DTC is not set » All OK. ⇓ If the DTC is not set
  5. 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