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2016 2nd Gen Cruze LT
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Auto Start/Stop won't work below 41 degrees. There are other conditions that must be met as well before it will function.
Here are the conditions from the Owners Manual:

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Are you running the fan? I've noticed Auto stop will not work for me if I have the heat on. When at a light if I turn the fan off (Yes AC is completely off), Auto Stop is engaged. If I turn the fan on, it starts up.
Auto Stop seems to be finicky. I can't even see how beneficial it is. For me anyway. I'm never at a light long enough to see the benefit.
Just my 2 cents.
 

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Anyone know why start/stop wouldn't be working? It's 46°F outside according to the car's display and just got it back from the dealer
What kind of service work did you have done? It may or may not have anything to do with Auto Stop not working, depending on the work performed.

The following conditions must be met for Auto Stop/Start to function.

Initial minimum vehicle speed during the drive cycle must be 12 m.p.h. (19 km/h) or greater.Subsequent Auto Stop minimum speed may vary from 1-6 m.p.h (2-10 km/h).

Ambient engine coolant and transmission fluid temperature correlation meet specified values.

Hood switch status is closed.

Brake booster vacuum is greater than 7 psi (45kPa).

Transmission is in Drive.

Vehicle speed is less than 3 m.p.h. (5 km/h).

Engine speed is below 1,500 rpm.

Engine coolant temperature is less than 248 degrees F (120 degrees C).

Ambient temperature is greater than 40 degrees F.

No A/C compressor request from HVAC.

Battery voltage is greater than 12 V.

Battery state of charge is greater than 75 percent.
 
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