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Home >> GMC >> 2018 >> Terrain SL >> Repair and Diagnosis (Single Page) >> Electrical >> Charging Systems >> 12 V Starting And Charging System >> Diagnostic Information And Procedures >> DTC P15A3: Stop/Start Select Switch Circuit Signal Message Counter Incorrect >> Circuit/System Verification
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Circuit/System Verification

  1. Ignition ON
  2. Verify with a scan tool that no DTC is set in the BCM.
    • Go to next step: If no DTC is set 
  3. Verify with a scan tool the Engine Control Module Stop/Start Select Switch parameter changes between Yes and No while pressing the Stop/Start switch.
    • If the parameter does not change 

      Refer to Circuit/System Testing below

    • Go to next step: If the parameter changes 
  4. All OK.
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