10-28-2018, 04:10 PM | #1 |
Space Shuttle Aficionado
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Car sometimes won’t shift out of 4th
Need your help guys,
This issue started within the last two days. At first I just assumed it was a hiccup, but now it’s happened again and even worse. Today I was on an open road and did a “spirited” pull while I was in drive (as opposed to paddle shift or sport). Moderately braked to a stop and sat for about 10 seconds then very lightly accelerated from a stop. From the start the car didn’t feel like it was in 1st or 2nd. When I got up to 50 mph, the car aggressively downshifted to 4th and stayed there. I got up to 70ish and the car was approaching 5k on the rpm. I started to coast to give the car a second to shift and nothing. I had to brake for the car to finally shift up to 5th, then 6th. The car has 25,000 miles on it. 13,000 of which I put on this year. Trans temp was 180 while this was happening. Any ideas? Gonna start by going through all the electronics first
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10-28-2018, 05:04 PM | #2 |
376 cubic inches of fun
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What happens when you use the paddles? Does the transmission respond to paddle inputs?
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10-28-2018, 05:24 PM | #3 |
Space Shuttle Aficionado
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Yes. It paddle shifts fine.
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10-28-2018, 05:24 PM | #4 |
Tri-County Camaro SWFL
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Can you check your trans fluid level?
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10-28-2018, 06:33 PM | #5 |
Space Shuttle Aficionado
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Don’t really have the means to check it. Which is frustrating because that’s a very good idea.
Does it sound like a trans flush?
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10-29-2018, 07:02 AM | #6 |
old school chevy rodder
Drives: 2013 2SS/RS Manual,DM exhaust,CRT Join Date: Jul 2012
Location: Oregon
Posts: 5,587
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Sounds like it needs a Dyno tune, headers and high flow cats with a CAI to fix that trans issue...… Or maybe switch fluids out with some royal purple or something; but I like my first idea better and it results in maybe being able to burn rubber much easier and sounding much more macho while eliminating that annoying AFM …..
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2021 Wild Cherry ZL1 A10, Sunroof, Data, Carbon, Nav, RotoFab Dry CAI, Elite x2, Borla ATK, Driveshaft shop
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10-29-2018, 08:34 AM | #7 | |
Space Shuttle Aficionado
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Quote:
Taking the car into the shop at 3pm today. We'll see what they say.
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10-29-2018, 08:44 AM | #8 |
Drives: 2013 Camaro 2SS RDP Tuned L99 Join Date: Apr 2013
Location: Ottawa, Canada eh?
Posts: 1,889
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Judging by the RPMs and speed you noted I would think its actually sticking in 3rd not 4th. I know in my L99 if I was at 5k or so in 3rd I would likely be over 90 mph so just thought I'd mention that in case it matters when getting it diagnosed.
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10-29-2018, 09:01 AM | #9 |
10-29-2018, 09:47 AM | #10 | |
Space Shuttle Aficionado
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Quote:
Texas Speed 7/8" long tubes. Also doing a ZL1 front fascia swap with GFX side skirts and rear diffuser. It's gonna be a different animal for Sturgis.
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10-29-2018, 10:18 AM | #11 |
Fast Cars and Old Guitars
Drives: 2015 2SS RS (L99, baby!) Join Date: Apr 2012
Location: N. CA
Posts: 3,973
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New fluid and filter can work miracles sometimes. Only takes a spec of debris to foul up things in the valve body.
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“I don’t want to belong to any club that would have me as a member.” - Groucho Marx
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10-29-2018, 10:22 AM | #12 |
Drives: 2011 SIM 2SS/RS LS3 Join Date: Sep 2013
Location: Tupelo, MS
Posts: 5,902
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Hit up Juiced. He gave me a deal on my TSP headers
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2011 2SS/RS built 8/24/10
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10-29-2018, 11:52 AM | #13 |
376 cubic inches of fun
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A car with 25,000 miles isn't going to be low on transmission fluid unless there's a conspicuous leak, nor does it need a flush, most likely.
Since it paddle shifts OK, it sounds like an electronic or software problem. |
10-29-2018, 12:18 PM | #14 | |
Space Shuttle Aficionado
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Oh sweet! Will do. One of my friends through out a software update. Any idea what Chevrolet would charge for a software update?
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