06 4runner tranny problem


#1

My wifes 06 4runner 2wd with 120000 miles on it needed a new battery. I changed the battery that night and my wife called me the next morning when i was at work and told me that her car was idling low with a slight vibration at almost all speeds. Also, when stepping on gas pedal from a dead stop the vehicle hesitates only momentarily and then lurches forward like its slamming into 1st gear and then shifts and drives normally beyond first gear… I am perplexed. Never had any issues with tranny or any other component of the car for that matter until i changed the battery. Any opinions or advice welcomed. Thanks.


#2

@Pdrerup

I believe that the engine control module may need to relearn “its stuff” . . . because you replaced the battery

I wouldn’t be at all surprised if everything is “back to normal” in another day or two, maybe less


#3

These days cars have a memory for how best to adjust themselves to run well, and when the battery is removed, on some cars at least all that is forgotten and has to be relearned. Several other possibilities too, but as mentioned above, definitely don’t try to “fix” this problem until giving the ECM a few days or a week or so with a variety of driving conditions to relearn the proper optimized engine and transmission operating parameters.


#4

I agree with the other answers. Let the ECM get back on track before you try to do anything with the transmission. The battery was probably providing low voltage up until the time it finally died. That can cause an ECM to get out of whack since it needs a constant 12VDC to operate correctly.


#5

Ok. Thanks guys. I was thinking that was the problem after a lil googling of the issue. It drove like that for two days and then i disconnected the battery again to change a badly corroded battery terminal. It has since been driving badly for 4 days. And my wife drives it maybe 50 miles a day both on highway and stop and go in town within her daily commute. I will give it a few more days and then give an update. If no improvements within a week i will at least call a local tranny shop and hear what they have to say.