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HOMESERVICE MANUALSCHEVROLET2025TRAILBLAZER ACTIV, 4WDREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTILOCK BRAKE SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC C05D2CIRCUIT/SYSTEM VERIFICATION
2025 Chevrolet Trailblazer ACTIV, 4WD

Circuit/System Verification

2025 Chevrolet Trailblazer ACTIV, 4WDSECTION Circuit/System Verification
  1. Ignition/Vehicle - Off
  2. Inspect for damage - Brake System Brake System Slow Release
  3. Inspect for Leaks - Brake System Hydraulic Brake System Diagnosis
  4. Ignition/Vehicle - Off - For greater than 5 min
  5. Ignition/Vehicle - On - For greater than 60 s - Brake Pedal Not Applied
  6. Apply and hold the brake pedal.to half stroke - For greater than 2 s
  7. Slowly release the brake pedal.
  8. Verify DTC C05D2 is not set
    • If the DTC is not set 

      All OK.

    • Go to next step: If the DTC sets 
  9. Perform the scan tool control function: Brake Master Cylinder Pressure Test
    • If the procedure/test passes 
    1. Ignition/Vehicle - Off - For greater than 5 min
    2. Ignition/Vehicle - On - For greater than 60 s - Brake Pedal Not Applied
    3. Apply and hold the brake pedal to half stroke - For greater than 2 s
    4. Slowly release the brake pedal.
    5. Verify DTC C05D2 is not set
      • If the DTC sets

        Replace the component: A104 Brake Master Cylinder

      • Go to next step: If the DTC is not set
    6. All OK.
    • Go to next step: If the procedure/test does not pass 
  10. Bleed the brake system.Refer to: Hydraulic Brake System Bleeding (Pressure)
  11. Perform the scan tool control function: Brake Hydraulics Test
    • If the procedure/test does not pass 
  12. Replace the component: A104 Brake Master Cylinder
    • Go to next step: If the procedure/test passes 
  13. Ignition/Vehicle - Off - For greater than 5 min
  14. Ignition/Vehicle - On - For greater than 60 s - Brake Pedal Not Applied
  15. Apply and hold the brake pedal to half stroke - For greater than 2 s
  16. Slowly release the brake pedal.
  17. Verify DTC C05D2 is not set
    • If the DTC sets 

      Replace the component: A104 Brake Master Cylinder

    • Go to next step: If the DTC is not set 
  18. All OK.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.