Question about Pontiac Cars & Trucks
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Posted on Jan 02, 2017
the vehicle may have a electrical problem and or mechanical problem in the trans....id try replaceing the solenoids and then the entire transmision and torque converter.
Posted on Apr 05, 2009
SOURCE: limp mode on a automatic
Firstly, disconnect the battery and leave it for a few hours. Reconnect and try the car again. This resets the memory in the TCM. If the car picks up the faults again, it will go into limp mode again after a short while. If it's been a while since you changed the fluid, then put some seafoam transtune in to clean all the parts and plates. Then after a few days at least, preferably a week, go for a fluid and filter change. After this, you'll probably find it will go into limp mode again, just disconnect the battery again and reconnect after a few hours. I had the same problem in my chrysler T&C. I left seafoam in it for a week and it cleaned up all of the gum and varnish build up on the shift solenoid pack and plates.
If the problem persists, and after you find it allows you to change gears for a while and then goes into limp mode, it could be gummed up solenoid pack, or input speed sensor.
Go to o'reillys and plug in their diagnostic tool. It should provide you with the fault codes if any. If no codes, then your TCM and ECM are in good shape, and if you're lucky then it'll be something simple like a sensor, or solenoid. Try cleaning it first with seafoam transtune in the fluid for a week.
If all else fails, and their are fault codes, then take the car to a trusted transmission repair shop for a road test. The computer could be picking up slippage and making the car go into limp mode. This could be the clutch plates if no errors with the TCM, ECM are present, and you've ended up checking out the input speed sensor, and solenoid pack. The latter can cause hard shifting and slippage too, if the seed sensor is set to signal when to change gear, but the new oil, or old oil have made the friction slightly different to what it is used to or within factory limits. Firstly try reseting the TCM by disconnecting the battery for a while and see what happens.
Posted on Jul 25, 2009
Transmission fluid does not have to deal with nearly the number of problems engine oil has to, with heat, water, acids, grit, etc., so it is not at all critical. In the old days, Ford always had a different fluid because they used different material for seals. But these days the all the fluids sold are great.
As to how much, that depends. There will only be about 4 quarts in the pan and transmission, but the total is more than twice that, and it can very anywhere in between, depending on how much fluid drains down from the torque convertor. It has a little flap that is supposed to stop drainage, but it always leaks down slowly anyhow. So there is never any set amount. You just have to estimate how much came out, put that much in to start, and keep checking and adding, with the engine running.
Posted on Feb 11, 2010
Most transmissions have a limp mode, or limp-home mode.
If the driveline computer thinks there is something wrong, it can lock the transmission into one gear, such as 2nd gear. Usually reverse will also be available. The Impala automatic has 4 speeds. 2nd speed or gear will get you home, but the engine rpms can get a little high. I wouldn't get on the expressway will in limp mode.
Before taking to the shop, you might want to try and reset limp mode by turning the car off for a couple minutes, or you may have to disconnect and reconnect the battery.
Posted on Jun 06, 2010
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