Is the engine overheating? Seems to be an issue, but mostly with the Hisun engines. Don't know what make of engine you have, but there are others here who have experienced the same problem. Sort of sounds like it is overheating under a load, such as when you climbing hills.
Have you contacted Massimo yet?
Hello Folks - newbie here with my first post so go easy on me. I picked up a Buck 400 in May 2020 direct from Massimo when they were doing a closeout sale on the 400 models. I read the reviews and was skeptical.
We live in a golf cart community we do not plan any off roading - just some very mild work tasks like hauling firewood / brush etc. Honestly, all we do is cruise around our neighborhood roads. I pulled the trigger b/c the price was cheaper than a 2WD lifted golf cart and the Buck had way more features.
We have a few steep hills and after about 20 - 30 minutes of cruising, my check engine light comes on. It only happens when we are going up or down one of the hills . We head straight home and things seem fine the next day. Light never comes on unless we tackle multiple hills during one ride.
Should I be worried?
PS - Unit is 4 months old and has 258 miles on it - barely broken in. I've yet to go full throttle on a flat or up a hill.