Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit/System Verification
- Ignition ON.
- Verify there are no system voltage DTCs set as current or history in any control module.
- If any system voltage DTCs are set
Diagnose these DTCs first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Go to next step: If no system voltage DTCs are set
- If any system voltage DTCs are set
- Ignition Off and all vehicle systems OFF.
- Verify the battery voltage is within 12.4 V to 12.8 V at the C1 Battery.
- If not within the specified range
Refer to Battery Inspection/Test
- Go to next step: If within the specified range
- If not within the specified range
- Engine Running with all accessories off, allow the system voltage to stabilize.
- Test for 13 V to 15 V at the C1 Battery.
- If not within the specified range
Refer to Charging System Test
- If not within the specified range
- Verify the disable switch Indicator turns on and off when pressing and releasing the stop/start select switch.
- If the Indicator does not turn on and off
Refer to Circuit/System - Stop/Start Switch Malfunction
- Go to next step: If the Indicator turns on and off
- If the Indicator does not turn on and off
- Verify the scan tool parameters Battery Sensor Module state of Charge Error is less than 10%.
- If not the specified state
- Perform the Battery Sensor Module learn. Refer to Battery Sensor Module Learn
- After performing the Battery Sensor learn road test the vehicle and verify the Stop/Start system operates.
- If a condition exists, review the scan tool Autostop Disable Reason. Refer to Stop/Start Disable, Inhibit, and Restart Reasons .
- Go to next step: If no condition exists
- A fault is not currently present and may be an intermittent condition.
- Go to next step: If the specified state
- Road test the vehicle and verify the Stop/Start system operates.
- If a condition exists
If a condition exists review the scan tool Autostop Disable Reason. Refer to Stop/Start Disable, Inhibit, and Restart Reasons .
- Go to next step: If no condition exists
- If a condition exists
- Operate the vehicle allowing a vehicle Auto Stop/Start event to occur.
- Verify the infotainment system, HVAC system, instrument cluster, shift lever, park brake switch, and the left and right steering wheel controls continue to operate without interruption.
- If a condition exists
Refer to Circuit/System - Stop/Start System Malfunction
- Go to next step: If no condition exists
- If a condition exists
- A fault is not currently present and may be an intermittent condition.
A low or high voltage DTC may set in multiple control modules due to a concern with the battery or charging system.
The battery voltage should stabilize after a few minutes of turning the ignition/vehicle Off.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.