So i just did an oil change. after i changed oil my car started working weirdly. When i start driving the car stalled. Few codes that came up were P0134,p0154,p2237 and U2500. I know what the first three mean, but the forth one with a U i couldn't figure out, not even mitchell ondemand had it. So here is the thing. When my car works, it smells like unburnt gas. The fans go constantly on although its not too hot outside and no ac in use. When you start driving the car just happens to stall and VSC and traction lights go on. After that you cant start the car unless you don't turn key back to lock position. Also after the car stalls, for some reason the reverse gear is locked out (6 spd). So you would have to stick it in reverse when the key is in lock position to actually reverse the car. I don't know what happened to my Acura, any help would be appreciated.

 

U2500 (CAN) Lack of Acknowledgement From Engine Management

http://www.troublecodes.net/OBD2/Ucodes.shtml