Cylinder deactivation

WachalWachal CanadaMember Posts: 1
edited January 2021 in Chevrolet
hi, I just bought my 09 hybrid 1500. and noticed that it is Not deactivating half the cylinders when i come to a red light or anything. When i first bought it, it saw that at a stop, the rpm would go down to 'Auto' and deactivate, but months later its not doing that anymore.. Just wondering if anyone else has experienced this? Is there a button I many have accidentally pressed?
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