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Home >> Chevrolet >> 2010 >> Traverse LT, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 420 (Hydraulic Brake System) >> Diagnostic Information and Procedures >> DTC P258A-P258D: Vacuum Pump >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
  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.

    • If the brake booster pump motor turn ON and OFF 
  3. All OK.
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