Transmission problem?
#16
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I've had to replace my battery every two years for over 10 years now, no idea why - the alternator puts out 14V, the terminals are not corroded, but the battery does not hold a charge after two years. And the way I know the battery is getting weak is... the tranny does not engage in drive after backing out. Crazy but true.
Like I said, check or replace the battery before replacing the tranny, it's a lot cheaper and easier!
Like I said, check or replace the battery before replacing the tranny, it's a lot cheaper and easier!
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Trying to wrap my mind around how a bad battery makes the tranny shift odd. If the alternator is good, even with a bad battery, you should have around 14.2v... does the tranny pull so much current, that the alternator can't supply it, and the battery is needed to give up some of it's capacitance...?!
Last edited by sbagdon; 02-19-19 at 07:28 AM.
#17
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Trying to wrap my mind around how a bad battery makes the tranny shift odd. If the alternator is good, even with a bad battery, you should have around 14.2v... does the tranny pull so much current, that the alternator can't supply it, and the battery is needed to give up some of it's capacitance...?!
I also think that only some cars are susceptible to this for whatever reason - most folks here have never heard of this situation. But I know that I'm not alone, and after replacing three transmissions in 3 years for this exact issue (and almost doing a fourth, until I found the real culprit), I have been on the same tranny for 130,000 miles, without a hiccup (but 5 new batteries).
#18
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A bad battery must be at just the right place in the S160 system to really screw with the computer.
One universal truth is that computers hate being starved for voltage. It really freaks them out.
OP, swap that battery and tell us what happens.
One universal truth is that computers hate being starved for voltage. It really freaks them out.
OP, swap that battery and tell us what happens.
#19
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I also think that only some cars are susceptible to this for whatever reason - most folks here have never heard of this situation. But I know that I'm not alone, and after replacing three transmissions in 3 years for this exact issue (and almost doing a fourth, until I found the real culprit), I have been on the same tranny for 130,000 miles, without a hiccup (but 5 new batteries).
Not saying it's not a valid issue, just that we haven't experienced it, and we've seen some very low voltgages (during alternator failures).
#20
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Understand, just haven't experienced it. Our '98 GS4 battery light doesn't come on until about 10.5v, so when the alternator goes, we don't know until the starter is slow. Really wish it went off at 13.5v, so we have another 3v of driving in an emergency. Even when voltage got down to single digits, and we had to turn the lights off to limp home, the transmission never stopped shifting normally.
Not saying it's not a valid issue, just that we haven't experienced it, and we've seen some very low voltgages (during alternator failures).
#21
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2 Week UPDATE:
The issue has not returned after replacing the battery. Car fires up like a champ every time now. Odd how a weak battery could effect the car in such a manner. Thanks lyonkster, saved me from a transmission job!
The issue has not returned after replacing the battery. Car fires up like a champ every time now. Odd how a weak battery could effect the car in such a manner. Thanks lyonkster, saved me from a transmission job!
#22
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Sphan519 (03-06-19)
#23
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Always good to hear a happy ending. This thread ought to be stickied.
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Sphan519 (03-06-19)
#24
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Hi.
my 2000 GS 300 also when its engine is cold due to parked for 8hrs at work, it doesnt move rapidly once I crank it up and take off. The temp gauge doesnt move fast enough and gears dont work properly. Could it also be a thermostat issue?
my 2000 GS 300 also when its engine is cold due to parked for 8hrs at work, it doesnt move rapidly once I crank it up and take off. The temp gauge doesnt move fast enough and gears dont work properly. Could it also be a thermostat issue?
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