As i was driving home from work this morning i noticed my truck was getting low fuel mileage while driving on a 35 mph road. When i stopped at a light autostop never engaged. As i kept driving i checked the display and it didnt look like the hybrid battery was charging. Then i stopped to get fuel and it usually shows that i have 443 miles on a full tank but i showed 357 miles on a fuel tank. My truck is 6 years old and has 57k miles on it. Any idea what they problem could be? Ive already scheduled a appointment with a Chevy dealer but they couldn't tell me if it was warranty work or not.Other than that i have no engine warnings and it seems to be functioning normally

 

Ummm so i fixed it haha. Guess the 8 degree weather and my 2 mile drive to work took its toll it my hybrid battery. I took it on a 30 minute drive and when i pulled off the interstate and stopped at the light autostop engaged. And the battery was taking a charge again. Fuel max fuel mileage went back up to 443 on a full tank after i topped it off again.Lesson Learned i suppose i need to drive it more.

 

Drive it and be familiar with it.

 

In very cold weather it can take up to an hour to warm the battery up enough for Auto-Stop

 

The Traction Battery(the 300V one) does not like very hot or very cold temperatures, it can take a very long time on hot or cold days for it to start acting "normally".
BTW, I've noticed after 7 years and 140K miles that there is no real "normal", the Hybrid system always seems to have a mind of it's own.

 

I had no problems at 195k miles.