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a month old battery? what is the source? if you noticed, most folks here point finger to the battery - based on the community experience with those... even your statement that the batteryis new did not phase us off - check the battery UNDER A LOAD... the line in your error log about the undervoltage is very suspicious... if the battery is good, then next stop is alternator... if the alternator is proven beyond reasonable doubt to be innocent, then you need to check the speed sensor modules, the ABS module, the shaft output sensors... even an ambient temperature sensor... since you are getting some of the engine lights, it might make sense to check the spark plugs, coils, fuel filter and fuel pump... if all checks out fine, then move into the tranny... unless you see the sprockets and the tranny gears laying on the ground as you drive away, i would not tamper with tranny when there are so many other things that can go wrong...
you want to go from simple to more complex - this way you will expend least amount of money with the most amount of results... imagine that you overhaul your tranny (which probably will benefit from proper overhaul) and at the end of the day find out that a $20 speed sensor that you could replace yourself was the culprit all along...
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