Check Engine Code P-0700 Transmission Control Sensor malfunction

What is your question?

Check Engine Code P-0700 Transmission Control Sensor malfunction plus p-1971?/74? No DTC function Problem Mileage 114214 miles New Car Battery, then old alternator die. Replaced with new alternator, drove off shop lot then check engine code light came on. Return to shop, check code (above), some small 1st gear transmission jerkness. Understand it might be a sensor. Also understand if transmission completely is damaged, then $3-4000 repair cost. I would rather replace computer chip sensor than pay for entire transmission job. Am I thinking correctly. Will I have long term problems if I drive car with the engine cold light on? And with small 1st gear jerkness. Where do I look and where can I purchase replacement part? reply e-mail: martinwe357@cox.net please