The spacecraft – which unexpectedly discovered water on the planet closest to the sun – will slam into the planet at 8,750mph.
The problem – which saw Siri respond negatively to questions about homosexuality – was reportedly caused by a bug.
The unmanned New Horizons craft sends back a blurry photograph of the dwarf planet ahead of a flyby in July.
NASA says Dawn will explore why two visibly striking areas on the surface of Asteroid Belt body Ceres have different temperatures.
Scientists say their invention will help people find their way around unfamiliar places – but they also see other potential uses.