Usually, yes
Most carriers give a multi-policy discount when your home or renters policy and your auto are written together. The discount can apply to both policies, and one renewal date and one company make life simpler.
But not always
Sometimes one carrier has the best home price and another has the best auto price, and the two separate policies cost less than any bundle. That's common for drivers with a ticket or an SR-22, or for older homes.
Renters count too
Renters insurance is inexpensive and can earn the same multi-policy discount on your car, sometimes saving more than the renters policy costs.