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Home >> Buick >> 2020 >> Enclave Premium, AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brakes >> Diagnostic Information and Procedures >> DTC C027B >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON.
  2. Verify the brake booster pump motor turns ON and OFF when commanding the Brake Booster Electric Vacuum Pump On and Off with a scan tool.
    • If the brake booster pump motor does not turn ON and OFF 

      Refer to Circuit/System Testing.

    • Go to next step: If the brake booster pump motor turns ON and OFF 
  3. All OK.
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