2003 Deville base
Can a weakening battery cause my tranny to act funny? It seems to shift to a higher gear a little early sometimes and downshifts and upshifts a little hard at low speed. I replaced the engine/trans mount a few weeks ago, and everything is tight. No codes in DIC. Also my "lights on" indicator on the dash randomly comes on. I suspect my battery will need to be replaced soon as it is several years old. My headlights dim for a second when the AC compressor kicks in.