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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 29 (Hydraulic Brakes) >> Diagnostic Information and Procedures >> Brake Warning Indicator Malfunction (with UJ1) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the brake fluid is at or above the proper level.
  2. Command the IPC display test with a scan tool, the warning indicator should turn ON.
    • If the red brake warning indicator does not illuminate, replace the IPC.
  3. Ignition ON, observe the scan tool BCM Park Brake Switch parameter while applying and releasing the park brake. The parameter should cycle between Applied and Release.
    • If the parameter does not cycle between the specified values, refer to Park Brake Switch Malfunction.
  4. Observe the scan tool IPC Brake Fluid parameter. The reading should be OK.
    • If not the specified value, refer to Brake Fluid Level Switch Malfunction.
  5. If all steps above test OK, refer to Brake Booster Fluid Pressure/Flow Alarm Switch Malfunction.
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