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Tahoe / Yukon Service Manual

DTC C0505, C050B, C0511, or C0517

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 C0505 Left Front Wheel Speed Sensor Correlation DTC C050B Right Front Wheel Speed Sensor Correlation DTC C0511 Left Rear Wheel Speed Sensor Correlation DTC C0517 Right Rear Wheel Speed Sensor Correlation Symptom Byte Information: Symptom Byte List Circuit/System Description For an overview of the component/system, refer to: ABS Description and Operation Conditions for Running the DTC The vehicle speed has reached 6 km/h (4 MPH) at least once during this drive cycle. Conditions for Setting the DTC If the value does not change Wheel Speed Sensor = Less than 1.5 km/h (1 MPH) Debris on the component. Incorrect installation of a component: B5 Wheel Speed Sensor = Incorrect air gap Electromagnetic Interference The reluctor ring has missing teeth, magnetic segments, or indentations for a reference gap. Actions Taken When the DTC Sets ABS Indicator Control = ON Traction/Stability Control Indicator = ON Malfunction Indicator Lamp (MIL) = ON A message and/or warning indicator may be displayed to the driver. DTCs listed in the DTC Descriptor category = Type A DTC Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type A DTC Diagnostic Aids Inspect the component for wear or damage: B5 Wheel Speed Sensor . Do NOT use a magnet to clean the component: Encoder Ring . Inspect the following components: B5 Wheel Speed Sensor = Correct part . If the customer comments that the ABS indicator is ON only during moist environmental conditions (rain, snow, vehicle washed), inspect the wheel speed sensor wiring for signs of water intrusion. 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 DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool Reference Control Module References Circuit/System Verification

  1. Verify there are no DTCs set related to the following component/system: Antilock Braking System ⇒ If any of the DTCs are set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If none of the DTCs are set
  2. Inspect the following components: B5 Wheel Speed Sensor ≠ Correct part B5 Wheel Speed Sensor = Visible Damage ⇒ If a condition exists Replace the component: B5 Wheel Speed Sensor ⇓ If no conditions exist
  3. Test drive the vehicle. All sensors must show the same speed when driving in a straight line at a speed greater than 40 km/h (25 MPH).
  4. Verify the following parameters are within 1.6 km/h (1 MPH) of each other: Wheel Speed Sensor ⇒ If within 1.6 km/h (1 MPH) of each other Replace the component: K160 Brake System Control Module ⇓ If not within 1.6 km/h (1 MPH) of each other
  5. Inspect the wheel speed sensor reluctor ring for foreign debris. Refer to: Wheel Speed Sensor Reluctor Ring Cleaning and Inspection
  6. Replace the appropriate component: B5 Wheel Speed Sensor
  7. Verify the DTC does not set. ⇒ If the DTC is set Replace the component: K160 Brake System Control Module ⇓ If the DTC is not set
  8. 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