Shared ground
These verses close the Ahaziah episode by reporting three things in a tight sequence: (1) Ahaziah’s death matches what Yahweh had previously said through Elijah, (2) the throne passes to Jehoram because Ahaziah had no son, and (3) the writer points to another record for more details about Ahaziah’s reign (2 Kings 1:17–18).
The text presents history as accountable to Yahweh’s spoken “word” (word): what was announced is later described as having happened. It also treats royal succession and regnal-year dating as important for understanding the larger story, especially because Israel and Judah have parallel kings.
Where interpretation differs (only where needed)
A main question is how to understand the double use of the name “Jehoram” in v. 17. Some read the verse as straightforward: Jehoram of Israel succeeds Ahaziah, and the timing is anchored to Jehoram of Judah’s second year. Others argue the numbers and names across Kings can be difficult to align, so they propose alternate ways of calculating regnal years (or see a copying mistake in the numbers) to make the timelines cohere.
Why the disagreement exists
The verse links two kingdoms’ calendars in one sentence while using the same royal name twice, and ancient regnal-year systems could count “years” differently (for example, whether a partial first year is counted). Those factors can produce apparent tensions when readers try to harmonize every date precisely.
What this passage clearly contributes
Explicit in the text: Ahaziah dies “according to” Yahweh’s word spoken through Elijah; Jehoram takes his place; the transition is dated to Judah’s Jehoram’s second year; the lack of a son explains the succession; and the narrator signals that other acts of Ahaziah existed in an external royal record.
Reasonable inference: the writer wants the reader to see prophetic speech as reliable in the story’s world, and to see Israel’s political changes (even mundane succession details) as occurring within that larger framework of Yahweh’s declared outcomes.