| Re: Is this a serious code, U1255
Yes, I think a loose or bad gas cap can set the P0440, though not positive.
Yes, TCC stuck off means that there is a little slippage in the torque converter as opposed to being locked up at 41 MPH, but that should cost you no more than about 1 MPG. TCC does not engage at idle (if it did or was stuck on, it would stall the engine), so I doubt that is your cold starting problem. Have you checked the fluid level or changed it? |