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Listen to DE137. New technology has wireless feed from the trans to the speedometer. Unshielded wiring can mess with the signal. Tapping into the wrong circuit for power could affect voltage readings to the ecm for the system you tapped.
Also, sensors read driveshaft revs for input into the ecm. A change in tire diameter (do you love those new 22" rims?) skews the math. The vehicle is not going the speed it thinks it is, the shift points get out of whack. Data from the ABS sensors and the vehilcle speed sensors don't agree, the ecm gets confused and pops a trouble code.
Shortly after that, Peter Sellers rolls into the room in a wheelchair and and salutes, "Sieg Hiel!" (;-))
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"Regret can be a harder pill to swallow than failure .With failure you at least know you gave it a chance..." David Howard
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