Auto Stop Not Working (yeah?)

[Northern Mi Rich]

Hi - here’s a weird one. Picked up my ‘21 SLT Yukon (2500 miles) from GMC service dept, was in for the airbag switch recall and replacing the window washer pump. Driving it home I noticed the “auto stop” is not auto stopping! Tried several times and sat for over 2 minutes with no stop. Prior to service it stopped after 5-10 sec of not moving. I’m torn between being happy that the annoying feature is not working vs. wondering if there are other things that I haven’t noticed yet that aren’t working after this service visit. I left a message with service and asked if they possibly flashed a new program or something that might have effected the auto stop. Waiting for a call back.

 

[JasonHTX]

If the internal cabin temp doesn't match what you have it set to, then the auto off won't engage. Not sure if that's the situation with you, but it's something I learned listening to one of the reviews for the '21 Yukon.

 

[Northern Mi Rich]

Quick follow-up. Service is telling me after disconnecting battery during service, it may require some drive time to get battery voltage back up. Apparently vehicle won’t allow auto-stop until battery is at full voltage. We’ll see!

 

[RugbyRef]

If the internal cabin temp doesn't match what you have it set to, then the auto off won't engage. Not sure if that's the situation with you, but it's something I learned listening to one of the reviews for the '21 Yukon.

 

[G-Frog]

View attachment 269770

Owner's manual page 229:

Auto Stops may not occur and/or Auto Starts may occur because:
- The climate control settings require the engine to be running to cool or heat the vehicle interior.
- The vehicle battery charge is low.
- The vehicle battery has recently been disconnected.
- Minimum vehicle speed has not been reached since the last Auto Stop.
- The accelerator pedal is pressed.
- The engine or transmission is not at the required operating temperature.
- The outside temperature is not in the required operating range.
- The vehicle is shifted out of D (Drive) to any gear other than P (Park).
- Tow/Haul Mode or other driver modes have been selected.
- The vehicle is on a steep hill or grade.
- The driver door has been opened or the driver seat belt has been unbuckled.
- The hood has been opened.
- The Auto Stop has reached the maximum allowed time.

 

[tomgilk]

Auto stop also won't kick on if you're AC temp is at the lowest - which is basically the same thing as said above. Even if you put it at 62 it'll still turn off a lot but at low auto stop never kicks in.