So yesterday after watching one of DieselTechrons vids about low/no boost, I pulled the MAP hose off just to visually check that mine was ok and wasnt going to cause a problem down the road since this seems to be a common problem. Just to let you guy know i was NOT having any boost issues, i was just inspecting the hose. Hose was fine so i put it back on, no biggie. Well i get in my truck to leave work and notice my stock boost gauge isnt working and the engine light is on. After researching i pulled hose back off, made sure it was a snug fit when i put it back on, unplugged the MAP sensor, cleaned connectors, plugged back in...still the boost gauge will not move...The truck runs fine, no smoke, no rough idle, nothing....what could have happend?? (2006 f250 6.0 throwing P0237 code)

 

So I replaced the MAP sensor, boost gauge back in operation still have check engine light tho.......

 

You will need to clear the codes. The CEL will stay on until the codes are cleared.