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Home >> Cadillac >> 2017 >> CTS Base, AWD >> Repair and Diagnosis (Single Page) >> Electrical >> Body Electrical >> Battery, Charging System And Starting System >> Diagnostic Information and Procedures >> DTC P1077, P1078, P107A, P107B, P107D, or P107E: Stop-Start Capacitor Control Module, Stop-Start Control Module >> Circuit/System Verification
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Circuit/System Verification

  1. Ignition OFF, measure and record the battery voltage at the battery terminals.
  2. Verify the battery voltage stabilizes between 12.4 and 12.8 V within a few minutes of turning the ignition OFF.
    • If battery voltage is between 12.4 and 12.8 V 
  3. Engine running, headlights ON, measure and record the battery voltage at the battery terminals.
  4. 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 1 or is greater than 15 V. 

      Refer to Charging System Test .

    • If the voltage is at least 1 V greater than the voltage measured in step 1, but less than 15 V. 
  5. Verify DTC P1077, DTC P1078, DTC P107A, DTC P107B. DTC P107D, or DTC P107E does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

    • If the DTC does not set 
  6. All OK
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