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The transmission is slipping in my 2010 Impala. It only does it from a stop but does not happen all the time. It will rev up and move very slow and then all the sudden grab. I seen a few Threads on this but did not find a solution.
 

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I have the same issue on my 2010. Its probably the high pressure solenoid. Very common issue with these impalas. I had heard a tune would help with the issue but that was not the case with mine. Now its more pronounced. Its been doing it for a while now but seems to not really affect drivability. I believe you have to separate the trans from the motor to get at the part. And if you’re doing that one, you may want to do the rest since you’re that far in.


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Mine did that twice a couple weeks ago, it was 86 degrees and I was stuck in traffic.
The next day I sucked 24 onces of fluid out with my Mityvac & added 24 onces of Lucas trans fix.
It hasn't happened since. I can't say for sure it won't happen again though.
Car is an 09 SS, it had a BG trans flush done at 54,000 miles that improved shifting. It has 71,000 on it now.
The trans fix improved shifting too.

https://lucasoil.com/products/transmission-products/lucas-transmission-fix
 

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Check your transmission fluid level and condition. Fluid should be a pinkish red color. If it looks brownish tan a fluid change may help.
 

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Discussion Starter #5
Mine did that twice a couple weeks ago, it was 86 degrees and I was stuck in traffic.
The next day I sucked 24 onces of fluid out with my Mityvac & added 24 onces of Lucas trans fix.
It hasn't happened since. I can't say for sure it won't happen again though.
Car is an 09 SS, it had a BG trans flush done at 54,000 miles that improved shifting. It has 71,000 on it now.
The trans fix improved shifting too.

https://lucasoil.com/products/transmission-products/lucas-transmission-fix
Im not sure if your supposed to take fluid out? I read on the website that you just add it to the existing fluid. Either way let me know if it seemed to work.
 

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Discussion Starter #6
Check your transmission fluid level and condition. Fluid should be a pinkish red color. If it looks brownish tan a fluid change may help.
Fluid level is full. I just had a trans flush done and it did not seem to help at all.
 

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I know they say to just add the trans fix but if your fluid is full I'd take some out before adding to it.
You don't want to over fill it.
I've put over 1,000 miles on since adding the trans fix, it hasn't happened since.
 

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Transmission additives are just a band aid. Most work pretty good for awhile but are not a permanent solution to a broken transmission. They probably will work long enough for you to save some money to rebuild or replace your transmission.
 

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Transmission additives are just a band aid. Most work pretty good for awhile but are not a permanent solution to a broken transmission. They probably will work long enough for you to save some money to rebuild or replace your transmission.
Agreed...if it gets him 6 months it's worth it.
I did get a permanent fix with an additive once before.
20 years ago I was a Snap On Tool dealer, my truck had a 427 chevy engine and Allison auto trans.I would have to let off the throttle to get it to shift from 1st to 2nd. The owner of a trans shop I serviced recommended an additive, I don't remember what brand it was but it cured the shifting problem permanently.
 

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My 2008 Chev Impala transmission also slips intermittently, then slams into first gear. I took it to a Chev dealer and also an independent transmission repair, but the transmission didn't produce the symptom at either place. When I drove it home, of course, it slipped and slammed into gear. There are no computer codes to identify the problem either. The independent transmission shop did a complete transmission service, but that did not remedy the problem. So frustrating.
 

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I have a 2003 crown victoria that I thought the transmission was going in. It was not slipping but was making random shifts while driving. I cleaned the throttle body about a year ago and the car has shifted perfect ever since. I know its off topic a little but I thought it was interesting how the two affected each other.
 

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FWIW, mine does the shift-bang from stop as well. It's only occasional, and it only does it in cool weather. For some reason, it doesn't seem to matter what the trans temp is. If the ambient temperature is about between 40 and, say, 55, it might do it once out of every ten starts.

It used to be really bad, and I'm talking knock-coffee-out-of-my-hand bad. I put in a bottle of Lucas Oil transmission fix (without taking fluid out), and it went away for about 9 months or so. It's started happening again on occasion now that temperatures are dipping, but unlike before it's nowhere close to being as violent, and it happens much more rarely.

Ditto to the transmission fix being a band aid. Thankfully I know people who have had this problem for years in their Impala and their transmission never gave out. Also the consensus seems to be it is a pressure control solenoid that is causing the issue. However, to replace it the trans needs to be dropped and that's always... fun. Urgh.

My two cents. Hope this helps!
 

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Pressure control solenoids are a common failure, slip/bang is a common failure mode before they set codes, codes like P1811, and P0961 if it detects an electrical issue. It can be replaced with transmission in situ, but does require removing side cover and lowering the drivers side of the subframe several inches. Not fun in a driveway. Expect a typical shop to charge anywhere between 4-6 hours of labor for the replacement
 

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Tranny troubles

Mine too was slipping hard into 1st. I had it rebuilt for 2k. Ouch! I wrecked it with 10k miles on the rebuilt Tranny. I'd like to get rid of it if you would be interested. I'm new to this forum. I don't know if it's appropriate to sell things on the forum. However, I have it with receipts to prove rebuild and new parts. I bought the car back from the insurance company to use the parts for my new(to me) 2011 Impala LTZ. But the car only has 30k miles on it. So, I doubt I'll need the Tranny.
 

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Mine too was slipping hard into 1st. I had it rebuilt for 2k. Ouch! I wrecked it with 10k miles on the rebuilt Tranny. I'd like to get rid of it if you would be interested. I'm new to this forum. I don't know if it's appropriate to sell things on the forum. However, I have it with receipts to prove rebuild and new parts. I bought the car back from the insurance company to use the parts for my new(to me) 2011 Impala LTZ. But the car only has 30k miles on it. So, I doubt I'll need the Tranny.
Where you located? Are you looking to get your full 2K back?
 

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Mine too was slipping hard into 1st. I had it rebuilt for 2k. Ouch! I wrecked it with 10k miles on the rebuilt Tranny. I'd like to get rid of it if you would be interested. I'm new to this forum. I don't know if it's appropriate to sell things on the forum. However, I have it with receipts to prove rebuild and new parts. I bought the car back from the insurance company to use the parts for my new(to me) 2011 Impala LTZ. But the car only has 30k miles on it. So, I doubt I'll need the Tranny.
You really should post an ad in the Private For-Sale classifieds section of the forum - you'll have MUCH better visibility there. Just make sure to include your location, the price and a picture (they are the general rules for the "For Sale" section).

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I have 158k miles on my '09 LTZ and I bought the car new. The original transmission still shifts perfect, no issues at all. I change fluid and filter every 45k miles. No flushing.
 
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