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dwaynet

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  1. 2-3 shift —MC-10176309-9999[2427].pdf I have posted on this issue with my truck before but I wanted to repost. I have a 2019 Silverado 1500 with 6 speed transmission, after a cold start the first 2-3 shift is harsh, often Extremely harsh! I cringe after every cold start! Twice a day, in the morning going to work and then at the end of a workday. Note this issue is not as bad in warmer weather. I always have to pull out of my driveway in reverse before going forward so the reverse thing as mentioned in the bulletin does not apply. I brought it to the Chevrolet dealer yesterday and they gave me the famous GM "Functioning as designed" bullshit line. I am going to call them back on Monday. They attached this Bulletin to my order, I have attached this here as a pdf and I also copied within this text. My question is this....the bulletin describes a 2-3 upshift slip** or flare**. I researched it and a slip or flare is when the engine revs up because a transmission slips momentarily before engaging. ***My engine does not rev up, there is a harsh shift only! It is harshest when I am accelerating, getting up to about 2000 rpm and then having to reduce the throttle (re. to slow down) due to traffic, then a Big Thump from 2-3. How could this bulletin apply to my issue as described?? Any Thoughts on this! I can see this issue as described within the bulletin has happened for years and years...dosen't GM ever try to fix issues like this? All I know is I have bought many new trucks for years, Ford and even Ram dealers have bent over backwards to fix any of their issues...at least for me. Thanks: Dwayne Bulletin No.: PIP5429A Published date: 05/8/2020 Preliminary Information PIP5429A 2-3 Upshift Slip or Flare Models Brand: Model: Model Years: VIN: Engine: Transmissions: from to Cadillac ATS 2013 - 2015 All All All MYA Cadillac CTS Models 2008 - 2015 All All All MYA MYB MYD Cadillac Escalade Models 2007 - 2016 All All All MYC Cadillac SRX 2007 - 2009 All All All MYB Cadillac STS Models 2006 - 2011 All All All MYB MYC Cadillac XLR Models 2006 - 2009 All All All MYC Chevrolet Avalanche 2007 - 2013 All All All MYC Chevrolet Caprice PPV 2011 - 2017 All All All MYA MYC Chevrolet Colorado 2015 - 2020 All All All MYB Chevrolet Camaro 2010 - 2015 All All All MYB MYC MYD Chevrolet Corvette 2006 - 2014 All All All MYC Chevrolet Express 2010 - 2020 All All All MYD Chevrolet Silverado 2014 - 2018 All All All MYC MYD Chevrolet Silverado New Model 2019 All All All MYC MYD Chevrolet Silverado 2020 All All All MYC MYD Chevrolet SS 2014 - 2017 All All All MYC Chevrolet Suburban 2007 - 2020 All All All MYC Chevrolet Tahoe 2007 - 2020 All All All MYC GMC Canyon 2015 - 2020 All All All MYB GMC Savana 2010 - 2020 All All All MYD GMC Sierra Models 2014 - 2018 All All All MYC MYD GMC Sierra New Model 2014 - 2018 All All All MYC MYD GMC Sierra Models 2020 All All All MYC MYD GMC Yukon Models 2007 - 2020 All All All MYC Hummer H2 Models 2008 - 2011 All All All MYC Involved Region or Country NORTH AMERICA and N.A. EXPORT REGIONS Condition Some customers may comment on a 2-3 upshift slip or flare. Cause This condition is a NORMAL characteristic of the transmission, it will not cause durability concerns and no repair attempts should be made. Service Procedure: At this time this flare condition has been recognized in two different driving conditions: 1. During the first 2-3 upshift after the vehicle has been sitting, engine off for several hours. This condition may be caused by air that is trapped in the 3-5-R clutch assembly. When the first 2-3 upshift is made this trapped air is purged and the following 2-3 shifts will be normal with no flare. When diagnosing this condition a garage shift into reverse before drive will purge this air and prevent the 2-3 flare from occurring. This condition is a NORMAL characteristic of the transmission, it will not cause durability concerns and no repair attempts should be made. Please communicate to the customer this will not impact the designed performance or reliability of the vehicle. Please share this information with the customer, including a copy of this message. 2. When transmission ATF temperature is at or below 85 degrees F (30 degrees C). This 2-3 upshift flare can occur until the ATF temperature warms. If the 2-3 flare is determined to be ATF temperature sensitive use a Tech 2 or GDS2 to make note of the throttle position when the flare occurs. Drive the vehicle to get ATF temperature to at least 104 degrees F (40 degrees C) and then make several 2-3 shifts at the throttle position determined to be the most sensitive to the 2-3 flare. This will allow the transmission adapts to tailor the shifts and may help to eliminate the cold 2-3 flare. This condition is a NORMAL characteristic of the transmission, it will not cause durability concerns and no repair attempts should be made. Please communicate to the customer this will not impact the designed performance or reliability of the vehicle. Please share this information with the customer, including a copy of this message. Notice: A revised TCM calibration has been released and is available on TIS2WEB to improve this concern in 2007 vehicles equipped with the 6L90 RPO MYD automatic transmission. Version History Version 1 Modi
  2. Well whatever the issue is with a harsh shift or hesitation you shouldn’t have to live with it. If they its a normal operating characteristic and even if they have a technical bulletin saying its normal its all bullshit. GM has been getting away with problems with some of their vehicles for too many years, they can’t even be bothered to actually solve a problem like yours, been there done that! But go ahead and see if they come up with a fix...good luck!
  3. Hello, ya I am still trying to troubleshoot the issue but I don’t think its the radio stations signal, re. Different stations, same distortion, but only sporadically. I have never had this issue with any other vehicle, not impressed with this Chev, thats for sure.
  4. Ps..from what I read an upshift slip or flare is actually when the engine will rev higher (slip) just before the completion of the shift. My issue is a harsh thump only without a smooth shift, re..without the slipping or engine revving higher. So that bulletin may not be my issue.
  5. 2019 Chevrolet Silverado 1500 LD LT 4x4 Double Cab.. Hey, I don’t get it, my speakers at times have distortion even at low or mid volumes. Just on occasion, but it sounds like crap. It probably has more to do with the infotainment unit or head unit whatever they call it. If I pop in a music usb the speakers sound good, lots of bass with no distortion. Any experience or ideas out there?
  6. Thanks to all you guys that replied to my post. Special thanks for the bulletin on this issue. This harsh shift is less noticeable now that the temps in my area are getting above freezing, finally. It is still harsh even when going in reverse first before forward. AT ANY RATE: This is bullcrap that GM couldn’t even be bothered to fix this issue, they can call it normal all they want but its a flippin’ defect for sure. Any idiot knows that repeated harsh shifts will eventually wear/ break apart clutches, not to mention metal fatigue over time! Grrrrr!!!! Thanks to all, Dwayne
  7. Hello, as per the title my 2019 Silverado Z71 LD (classic style) LT truck with a 6 speed transmission shifts harsh from 2-3 after a cold start. It only shifts harsh upon the first shift after a cold start but is fine after that. I only have 10,000 kms on this truck. This happens with a normal light throttle, I have tried with more throttle but the shift is still somewhat harsh. I brought it in but they couldn’t reproduce the harsh shift, as per dealer there are no TSB’s for my trucks transmission. I have yet to drop the truck off overnight at the dealer to see if they can reproduce the issue. Does anyone out there know the actual cause of this? Or does anyone know of a fix for this? Please help, thanks, Dwayne
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