the first thing to do here,,is a load test on the chrging system,,,the load test will determine if you need a alternator...the voltage regulator on these is built into the alternator......if you dont have a load tester,,auto zone and most parts stores will do a load test for free...sense you get no codes,,this is where to start with your problem,,,i would think you may need an alternator
Is this a common problem..and lead to the shifting problem? It is very weird...I was going 65 on interstate..and it showed 19v...then started missing..I had to pullover...and wait a few min...then ran fine..but shifted hard..like I said. Are you sure that an alternator can cause such shifting problems?
well..it does sound as if it is the alternator..it is not real common but does happen...yes,,the high voltage may make the transmission to act weird,sense the transmission is computer cotroled....do the load test
Well today I am going to replace alternator. I tried to drive it..and it started and immediately went to over 19 volts and drove about 10 feet before stalling...this happened until I backed it back up to park in driveway. I did look up the RPO codes and have removed the old alternator and it is a 100 amp. I am going to replace it with one from Advance Auto today....
I will let you know whether the problem is solved with new alternator