One problem related to starter has been reported for the 2018 Honda Odyssey. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2018 Honda Odyssey based on all problems reported for the 2018 Odyssey.
Vehicle requires a jump start at least once a day in the course of normal use, no lights left on, no doors left open, no use of accessories without the car running. We will drive the car somewhere, be there for any length of time from 5-10 minutes at a gas pump to a few hours at a family members hour or a few days on a camping trip. The next time we try to start the vehicle, it will not start without a jump. This is the vehicle my wife and children use and I have to keep a portable jump starter in the car to avoid my wife and kids being stuck waiting for aaa to come jump the vehicle. 2 years old, just over 17,000 miles and we have had it in the dealer for multiple days and they tell us there is nothing wrong with it. This has to be some kind of electrical glitch or problem and it's frustrating that Honda has no answers.