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I'm glad it's not just me. I get it going from 1st to 2nd every so often. Higher speeds, I might have a little bit of hesitation, but it's the most noticeable 1st to 2nd. Temperature doesn't matter.

2018 Premier with 40,600 miles on it currently.
 

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I have a 2017. picked up brand new with 20 miles on the odo. I have a 2-3 slippage on occasion when the trans is cold. And strangely like someone else posted, when I turn left. It briefly allows the engine to rev up about 200 rpm during the shift. the 2-3 and 3-2 shift is definitely ....screwy. Haven't taken it to the dealer yet because I cannot consistently reproduce it.
My 2016 LTZ does the same thing and I also noticed it happens more if I am taking a left turn. Very strange and it has done it since day 1, dealer tells me it is normal so I just live with it. It doesn't do it all the time, very hard to recreate it.
 

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Ok....with all this Trifecta talk, does [or can it?] using Trifecta tune out the speed limiter at 112 mph?
I haven't tried to go that fast but I'm pretty sure it does. Best thing would be to ask Trifecta directly tho.
 

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Thanks, I contacted Trifecta and yes it will re-calibrate rev limiter [speed limiter]. They will re set limiter to match tire speed rating. Mine are at 130. :eek:k3:
 

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Anyone find a fix for transmission slipping?

I've got a 2016 LT V6 and I've occasionally got a 2-3 slip. I notice it when I'm babying it and it doesn't matter if the transmission fluid is hot or cold. When I drive it hard, I do not have any slip at all, in fact, the shifts are quick and firm.

Fluid is topped off, and I've drained and refilled it twice now (going to do it another two times to make sure it's all new).

In regards to the limiter, I've ran mine up to 120 and it was only limited by my right foot. To the best of my knowledge this car doesn't have a tune on it, but I could be wrong.
 

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I have the 2016 Limited with similar feeling issues. Either slipping or just really poor shifts in gears 1-3. Fluid still looks mostly red, but plan on changing it soon, although that does not appear to help others. Also thinking I may see if they can add an extra magnet for collecting bits of metal. I am avoiding a tuner like trifecta while the certified warranty is still good (until Spring 2022).
 

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My 2014 Impala LT 1LT is doing this exact same problem. I've discovered that the code it'll likely generate, at some point, for most of us (as it did for myself), is a P0705 OBD2 Diagnostic Trouble Code. These means that the wires leading from the transmission to the gear shifter may be faulty, one of the wires. There's one for each gear. That and \ or the Transmission Pressure Sensor is faulty or needs adjustments. And finally, and most likely for most of us, is that one or more of the Solenoids is faulty and needs to be replacement. These are the most likely causes for this code and I'm about to bring mine in to the have the transmission specialist determined exactly which one of these problems is it. Besides the slipping, mine also harshly kicks into 3rd gear, very vividly. Very aggravating for me, having just purchased my car.
 

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Oh, and I'm currently at 79,000 miles and just did my first full ATF Flush with full synthetic Dexron IV. In an attempt to help curve the issue somewhat, I replaced one of the quarts with Rislone Transmission Repair, as I've had this fix one my transmissions in the past, and it did somewhat helps. Mine no longer kicks when it goes from 2nd > 3rd gear now. Unfortunately the slipping is still prominent.
 

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On a final note, the P0705 code came and went. I've scanned and reset my DTC numerous times and only got the error code just the once time. Pretty ironic really.
 

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Fwiw, p0705= transmission range sensor (TRS) circuit malfunction (PRNDL input). TRS= NSS (neutral safety switch).
 
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