The gearbox light (D) is on intermittently with green light

After I start my Honda, it immediately begins to make knocking noises from under the hood, which continue up to three thousand revolutions per minute, and after the car warmed up for about 20 minutes,… 

Loading power and knocking sound coming from the head when accelerating has code for coils it's a VTEC so I'm not sure about the head

Gearbox rivers gear problem

knocking in the engine on start up only

When shifting from 1st gear to 2nd gear, it makes a knock and says gearbox fault and falls off the hammer.