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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 76 (Parking Brake System) >> Diagnostic Information and Procedures >> DTC C1138 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify that no other DTCs are set.
    • Go to next step: If no other DTCs are set 
  2. Vehicle OFF, measure and record the battery voltage at the battery terminals.
  3. Verify the battery voltage stabilizes between 12.4 V and 12.8 V within a few minutes of turning the vehicle OFF.
    • Go to next step: If battery voltage is between 12.4 and 12.8 V 
  4. Engine running, headlights ON, measure and record the battery voltage at the battery terminals.
  5. Verify the voltage is at least 1 V greater than the voltage measured in step 1, but less than 15 V.
    • If the voltage is not at least 1 V greater than the voltage measured in step 2 or is greater than 15 V. 

      Refer to Charging System Test .

    • Go to next step: If the voltage is at least 1 V greater than the voltage measured in step 2, but less than 15 V. 
  6. Verify the K17 Electronic Brake Control Module scan tool ignition voltage parameter is within 1 V of the battery voltage.
    • If not within 1 V of the battery voltage 

      Refer to Circuit/System Testing.

    • Go to next step: If within 1 V of the battery voltage 
  7. All OK.
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