How long will it take for auto tariffs to hit Berkshire Hathaway earnings?

Insurance (for example, GEICO) is the engine that drives Berkshire Hathaway.

As tariffs drive up new car costs, fewer new cars will be sold in the USA, and therefore fewer new insurance policies. More fierce competition for a shrinking pool of potential customers will theoretically drive up costs.

How long will it take for this to hit actual revenues and earnings.