Contradiction with Isaiah 7:1
This verse suggests that Rezin and Pekah went up to Jerusalem to war against it but could not prevail, while 2 Kings 15:37 indicates they were a threat to Judah.
Isaiah 7:1: And it came to pass in the days of Ahaz the son of Jotham, the son of Uzziah, king of Judah, [that] Rezin the king of Syria, and Pekah the son of Remaliah, king of Israel, went up toward Jerusalem to war against it, but could not prevail against it.