I just had my transmission rebuilt on my 95 SLS costing me 3300.00. Not all the time but on several occasions my service light comes on and the code is P039 other codes are history but that is the current one. The car when taking off will jerk, like a hard shift. I am going to take it back to the mechanic shop that fixed the transmission, ( I do have a 3 yr warranty) next week but could anyone tell me what it is, usually the service light will come on when I have opened her up on the expressway and when I turn the car off the light may not come on untill much later. But the jerk usually only occurs when the service light is on.