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Home >> Chevrolet >> 2015 >> Volt >> Repair and Diagnosis (Single Page) >> Electrical >> Body Electrical >> Wiring Systems And Power Management - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P1EF6 or P1EF7: Battery Charger Control Module Ignition On/Start Switch Circuit >> Circuit/System Testing >> Battery Charger Control Module Ignition Circuit Malfunction

Battery Charger Control Module Ignition Circuit Malfunction

  1. Perform the High Voltage Disabling procedure before proceeding with this diagnostic. Refer to High Voltage Disabling .
  2. Reconnect the 12 V battery.
  3. Vehicle OFF, disconnect the X1 harness connector at the T18 Battery Charger.
  4. Verify that a test lamp does not illuminate between the ignition circuit terminal A and ground.
    • If the test lamp illuminates 

      Repair the short to voltage on the ignition circuit.

    • If the test lamp does not illuminate 
  5. Vehicle in Service Mode
  6. Verify a test lamp illuminates between the ignition circuit terminal A and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Vehicle OFF.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, refer to Power Mode Mismatch .
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Vehicle OFF, disconnect the harness connector at the T18 Battery Charger and all devices that share the same ignition circuit.
    2. Test for infinite resistance between the ignition circuit terminal A and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance.
    3. Connect each of the devices one at a time and test for greater than 10 Ω between the ignition circuit terminal A and ground.
      • If 10 Ω or less, disconnect the appropriate device and retest to verify if the short is in the circuit or the component.
      • If greater than 10 Ω replace the appropriate device.
    • If the test lamp illuminates 
  7. Replace the K57 Battery Charger Control Module.
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