[joshuab]

Well just wanting to report my car seems to be doing actually fine at the moment it will shift sometimes a bit hard but not all the time, so I decided to get OnStar to do a full system health check on the transmission nothing came back. So I felt that wasn't good enough, so I had it hooked to a ultrascan scanner & check for any DTC on the transmission but nothing could be found far as active/pending state.

So I am starting to assume maybe I am as robby said "hypersensitive" due to so many repeating issues; so if no active DTC codes on the transmission I am thinking all systems are OK mechanically and electrically.

I got a appointment at the dealership this coming month for oil change, tire rotation etc, I will have checked further, but should I spend the money to get told what I already found myself? Thoughts?

 

[Tomko]

Well just wanting to report my car seems to be doing actually fine at the moment it will shift sometimes a bit hard but not all the time, so I decided to get OnStar to do a full system health check on the transmission nothing came back. So I felt that wasn't good enough, so I had it hooked to a ultrascan scanner & check for any DTC on the transmission but nothing could be found far as active/pending state.

So I am starting to assume maybe I am as robby said "hypersensitive" due to so many repeating issues; so if no active DTC codes on the transmission I am thinking all systems are OK mechanically and electrically.

I got a appointment at the dealership this coming month for oil change, tire rotation etc, I will have checked further, but should I spend the money to get told what I already found myself? Thoughts?

Spend the money on a mindfulness based stress reduction program.

It will give you more tangible and portable results.

 

[joshuab]

Thanks Tomko. Well I was out riding today & came by AAMCO Transmission care shop, so I decided to pull in there & allow them to run a check on my transmission as I felt that shift again & its annoying the he** out of me to say the least. Well they hooked it to the Snap-on Ultra scanner - & then test drove the car, the tech said there doesn't seem to be anything wrong w/ the transmission as he could tell & said tho it does act like a "transaxle sensor" or something of that sort , does this sound correct or what?

Plus they brought to my attention; that the transmission didn't show any active/pending stated DTCs. But they did find some pending codes from the engine, however they aren't any CEL light on at the moment; so here I am confused to what codes are so I will post these up for suggestions & I got appointment coming up real soon at the dealership & I will get all these issues taken care of promptly as I do not like issues like this ( well to me ) there is, maybe I am trying to fix the wrong one! haha

These are the DTCs they provided :

P0113 : Intake Air Temp.

CO277 : Brake Pedal Position sensor short to ground or open.

U0140 : Lost communication w/ body control module.

 

[Tomko]

Thanks Tomko. Well I was out riding today & came by AAMCO Transmission care shop, so I decided to pull in there & allow them to run a check on my transmission as I felt that shift again & its annoying the he** out of me to say the least. Well they hooked it to the Snap-on Ultra scanner - & then test drove the car, the tech said there doesn't seem to be anything wrong w/ the transmission as he could tell & said tho it does act like a "transaxle sensor" or something of that sort , does this sound correct or what?

Plus they brought to my attention; that the transmission didn't show any active/pending stated DTCs. But they did find some pending codes from the engine, however they aren't any CEL light on at the moment; so here I am confused to what codes are so I will post these up for suggestions & I got appointment coming up real soon at the dealership & I will get all these issues taken care of promptly as I do not like issues like this ( well to me ) there is, maybe I am trying to fix the wrong one! haha

These are the DTCs they provided :

P0113 : Intake Air Temp.

CO277 : Brake Pedal Position sensor short to ground or open.

U0140 : Lost communication w/ body control module.

Couple of things:

1) You found an honest AAMCO and technician. Post there names please.

2) There's a reason why the car doesn't have a pending light. It's because pending can and often do go away or resolve themselves.

3) You have done the equivalent of having a whole body MRI and discovered any number of illnesses when in fact you felt fine. But these illnesses are normal for everybody and the body resolves them regularly.

4) Sign up for that meditation course.

 

[joshuab]

Couple of things:

1) You found an honest AAMCO and technician. Post there names please.

2) There's a reason why the car doesn't have a pending light. It's because pending can and often do go away or resolve themselves.

3) You have done the equivalent of having a whole body MRI and discovered any number of illnesses when in fact you felt fine. But these illnesses are normal for everybody and the body resolves them regularly.

4) Sign up for that meditation course.

The AMMCO technician name was danny, ok well just glad there isn't anything wrong. I am just on edge w/ this as I don't want to experience anything further, or not be on my smarts & catching something 'simple' before it gets 'costly' by neglecting 'warning' signs as I thought this shifting 'roughness' was. So that all being said, I can sleep better at night knowing these issue are not something I need to get addressed promptly.

Its just because this car has NEVER did this type of shifting prior to awhile back when it started out of no where recently, that is the only reason I am edgy w/ this.

& that meditation course yeah I could use, but I think just relaxing & stepping away from this would really help I guess. Since the car has many checks w/o any indication of any pending/active DTCs. Wouldn't you agree to just step back from this, & let it be? lol

 

[Tomko]

The AMMCO technician name was danny, ok well just glad there isn't anything wrong.

Yeah, AAMCO Danny. He's well known on the interwebs.

& that meditation course yeah I could use, but I think just relaxing & stepping away from this would really help I guess. Since the car has many checks w/o any indication of any pending/active DTCs. Wouldn't you agree to just step back from this, & let it be? lol

The skill you'd learn from a meditation course will help you throughout life beyond this particular ownership experience. Makes sex better too. YMMV

 

[larlar75]

Thanks Tomko. Well I was out riding today & came by AAMCO Transmission care shop, so I decided to pull in there & allow them to run a check on my transmission as I felt that shift again & its annoying the he** out of me to say the least. Well they hooked it to the Snap-on Ultra scanner - & then test drove the car, the tech said there doesn't seem to be anything wrong w/ the transmission as he could tell & said tho it does act like a "transaxle sensor" or something of that sort , does this sound correct or what?

Plus they brought to my attention; that the transmission didn't show any active/pending stated DTCs. But they did find some pending codes from the engine, however they aren't any CEL light on at the moment; so here I am confused to what codes are so I will post these up for suggestions & I got appointment coming up real soon at the dealership & I will get all these issues taken care of promptly as I do not like issues like this ( well to me ) there is, maybe I am trying to fix the wrong one! haha

These are the DTCs they provided :

P0113 : Intake Air Temp.

CO277 : Brake Pedal Position sensor short to ground or open.

U0140 : Lost communication w/ body control module.

How much did it cost to do the test? I have a 2012 LS 1.8l that has had more than 20+ repair bills under warranty with a transmission replaced twice. It bucks down shifting to 1st, & shifting from 2nd to third

 

[joshuab]

How much did it cost to do the test? I have a 2012 LS 1.8l that has had more than 20+ repair bills under warranty with a transmission replaced twice. It bucks down shifting to 1st, & shifting from 2nd to third

When I pulled in & talked to them, they told me would be $39.99 to find trouble codes & provide those to me & a resolution. But upon checking they didn't find any trouble codes on the TCM that indicated a transmission issue, just found those "pending" codes where there wasn't any CEL on at the time so they said no charge to me, which I think was great.

Now does your actually slip out of gear?, Mine has went from "shift flaring" to I want to say a stall, no jerking or anything of that, it more like you can feel the engine moving sorta when it shifts, & also noticed when letting off the gas sometimes it feels like I am driving a manual car, you feel the engine likes its wobbling.

What is your actually doing? & are you still under warranty on the transmission? If so I would take to a dealer, my warranty is gone on transmission.

EDIT : BTW does anyone else experience such, when letting off gas as to feel like the engine moves, I have yet to get it duplicate all the time, but its happening around I think anywhere from 1600 to 1800 RPMs I think, more testing to get it to duplicate all the time, as I mentioned above its not happening all the time.

 

[larlar75]

So to describe my situation I want to first tell you that around 30,000 miles my car had the ECU & TCU updated which started these issues that never went away.

If I'm driving after the car has warmed up and I approach a light in 3rd gear, when my transmission downshifts into 2nd it feels like it skips 2nd and actually slams into 1st from 3rd.

Another example is if I'm driving in 3rd-4th-5th-6th and I step on the gas it'll downshift from whichever gear it was in, into the exact gear it needs to get into the powerband like lets say I come out of a parking lot and need to get into the far left turn lane quickly and I step on the gas while my car is in 4th gear, it'll downshift to 2nd bypassing 3rd causing my car to stall for a bit, then buck very very abruptly making me and my passenger slam their head against the headrest.

Now that second example could be totally normal due to the computer not having a sport tune on it and it just getting confused. The first example though is very easy to replicate if I put the car into the auto-stick mode and shift from 2nd into 1st it'll slam/jerk every single time!

My transmission is covered until 160,000ish miles due to it being replaced at 110,000 miles and another time previous to that BUT Chevy will not do anything when the transmission jerks because they need it to break itself in order to "fix" it. For instance my first transmission replacement at 40,000 miles started to jerk less than 1,000 miles after and lasted until 110,000 miles, and my current transmission jerks the exact same amount but didn't start until 2 weeks later and has been doing the same till this day @ 130,000 miles.

TL;DR - I think the jerking issue is due to Chevy's TCU tune. I always wanted to get a tune on my car to see if it would get rid of the jerking but I drive my car like a bat out of **** and apart from minor things getting fixed 20+ times and making my car a lemon I've NEVER had anything major happen execpt the two times my transmission has welded itself together from all the jerking after A LOT of miles and left me needing a AAA tow.

 

[joshuab]

So to describe my situation I want to first tell you that around 30,000 miles my car had the ECU & TCU updated which started these issues that never went away.

If I'm driving after the car has warmed up and I approach a light in 3rd gear, when my transmission downshifts into 2nd it feels like it skips 2nd and actually slams into 1st from 3rd.

Another example is if I'm driving in 3rd-4th-5th-6th and I step on the gas it'll downshift from whichever gear it was in, into the exact gear it needs to get into the powerband like lets say I come out of a parking lot and need to get into the far left turn lane quickly and I step on the gas while my car is in 4th gear, it'll downshift to 2nd bypassing 3rd causing my car to stall for a bit, then buck very very abruptly making me and my passenger slam their head against the headrest.

Now that second example could be totally normal due to the computer not having a sport tune on it and it just getting confused. The first example though is very easy to replicate if I put the car into the auto-stick mode and shift from 2nd into 1st it'll slam/jerk every single time!

My transmission is covered until 160,000ish miles due to it being replaced at 110,000 miles and another time previous to that BUT Chevy will not do anything when the transmission jerks because they need it to break itself in order to "fix" it. For instance my first transmission replacement at 40,000 miles started to jerk less than 1,000 miles after and lasted until 110,000 miles, and my current transmission jerks the exact same amount but didn't start until 2 weeks later and has been doing the same till this day @ 130,000 miles.

TL;DR - I think the jerking issue is due to Chevy's TCU tune. I always wanted to get a tune on my car to see if it would get rid of the jerking but I drive my car like a bat out of **** and apart from minor things getting fixed 20+ times and making my car a lemon I've NEVER had anything major happen execpt the two times my transmission has welded itself together from all the jerking after A LOT of miles and left me needing a AAA tow.

Well I will tell you that isn't good at all, harsh downshifting & it seems to skip 3rd on downshift & goes straight to 2nd. When you do manual mode & shifting yourself, do you experience these issues the same as in auto?

& plus if you have good warranty on this transmission I would at least get it into the dealership & get it documented that is what I would do. It seems you are having issues w/ your transmission as I did w/ my engine, it was rebuilt & week later had to be completely replaced.

 

[larlar75]

Yea I can replicate the 1st situation easily with auto-stick, but I can't do it 100% with the downshifting from 4th to 2nd etc. Because it only lets you input one shift at a time unlike when it's in automatic mode and the computer can do what it wants.

 

[joshuab]

I am not no expert at things; only guessing & giving my suggestions here. I am sure others will chime in & give some other expert advise, what this sounds like to me is transmission solenoid which would cause erratic shifting, delay shifting & all sort of things.

So my suggestions to you would be go get this transmission checked & have it hooked to the computer even those there isn't a engine light at the moment; doesn't mean there isn't a issue. The TCM could be storing some codes that could direct you into the right place for repair. So again I would strongly suggest that personally myself & I am sure others would agree.

 

[ccarson05]

Good news! I hooked up a OBD reader to the car and used an app to conclude the car is misfiring under high load in 3rd. I changed the spark plug gap- looks like I'm an idiot and over-gapped the new ones on original install. Set the gap to .28 and everything is now fine.

One thing to note: the power is NOT the same as when the gaps were when above .36 gap.

I'm going to open the gap to the suggested .33 (I think that is the suggested in another thread here). I'll report my findings.

Thanks again for all the suggestions!


Sent from my iPhone using Tapatalk

 

[joshuab]

Update : I do not know if these two are related in such way, so maybe someone else has experience such issue?, Well as I have made a post regarding 'brake caliper' issue, well I would set my Emer. brake & then somehow get my brake caliper from 'sticking' or whatever is going on. Well it would stop acting up & during this time my transmission would shift smooth as silk through all the gears & all on perfect shift points.

So would a stuck caliper cause transmission to think I am brake when I am when in fact I am giving gas & the system getting confused where it should shift up or down, I know this may sound crazy but doesn't hurt to ask.

 

[BrandoFisher117]

Update : I do not know if these two are related in such way, so maybe someone else has experience such issue?, Well as I have made a post regarding 'brake caliper' issue, well I would set my Emer. brake & then somehow get my brake caliper from 'sticking' or whatever is going on. Well it would stop acting up & during this time my transmission would shift smooth as silk through all the gears & all on perfect shift points.

So would a stuck caliper cause transmission to think I am brake when I am when in fact I am giving gas & the system getting confused where it should shift up or down, I know this may sound crazy but doesn't hurt to ask.

I don't think you're crazy at all. I actually appreciate "out-of-the-box" thinking.

 

[ProDigit]

Maybe I'm gravedigging here, but,
The issue I believe with 2nd to 3rd shifting, is the much larger gear differential between gears.
Between 2nd and 3rd shift, there's about a 1000RPM difference, while 3rd to 4th, to 5th, to 6th is about a 500rpm difference, which makes downshifting from 3rd into 2nd more of a jolt,
Plus, add the amount of torque the engine has in 2nd, compared to higher gears...

Second issue, I do believe that the ECU is more gentle on the first 2 gears. 3rd and 4th gear somewhat, are more jolty. Picking up the foot by a tenth of an inch off the pedal after a minor acceleration in 3rd gear feels more rough than 2nd or even 1st. I believe the ECU is softening up those first 2 gears. And 4th gear and up have less of jolting effect, because the torque on the engine to the wheels is much lower in those gears.

I find my 6spd automatic does have a sticky 3rd gear.
When shifting from 1st, to 2nd, to 3rd, the shifts are very smooth.
Shifting 3rd to 4th, sometimes the gear sticks, in 3rd, and jolts into 4th.
4th to 6th is smooth again...
Not sure what the cause of that could be...

 

[anthonysmith93]

I used to experience shift flare from 2-3 on my auto 2014 LT. It would only do it when the vehicle was running cold, and it would only do it every now and again and that was at around 30-35,000 miles. I'm now at 63,000 miles and haven't experienced that issue in quite some time. Every now and again I experience floaty/lofty shifting like it doesn't quite know which gear to be in, and sometimes I notice downshifts when coming to a stop more than other times, but never anything harsh or scary enough to cause concern. I also drive my car extremely hard and it's tuned, so I think it gets confused when I'm driving it like a normal person.

 

[ProDigit]

Yeah, true,
I also noticed it only happening when the transmission is cold.
Once the car is warmed up, no more jolting issues.

The floating between gears, I think, could be because the wet clutch, and the short time it stays in a gear.

The biggest issue I have with my 6spd auto gearbox, is the time it takes downshifting, when accelerating at higher speeds.
Eg: I'm doing 40MPH on the highway, and want to overtake the slow guy. Sometimes a gear shift takes 4+ seconds, sometimes up to 10 seconds. By that time, another car has already rear-ended me, if I'm not careful.
But I love the great gas mileage I get with the newer Dexos oils. Almost 20% better on the highway, compared to dino oils.

 

[jblackburn]

I used to experience shift flare from 2-3 on my auto 2014 LT. It would only do it when the vehicle was running cold, and it would only do it every now and again and that was at around 30-35,000 miles.

Yep, mine does this when it holds out 2nd til over 3k. I try to not let it do that if the engine isn't warm, but it usually happens coming up a hill near home.

Tune probably fixed it for you. Ford had a TSB addressing 2-3 shift flare on their version of the transmission with a programming update.

The biggest issue I have with my 6spd auto gearbox, is the time it takes downshifting, when accelerating at higher speeds.

Slam down hard on mine and it drops gears and takes off instantly. If yours is an early year Cruze, the programming really needed help.

 

[anthonysmith93]

Yeah, true,
I also noticed it only happening when the transmission is cold.
Once the car is warmed up, no more jolting issues.

The floating between gears, I think, could be because the wet clutch, and the short time it stays in a gear.

The biggest issue I have with my 6spd auto gearbox, is the time it takes downshifting, when accelerating at higher speeds.
Eg: I'm doing 40MPH on the highway, and want to overtake the slow guy. Sometimes a gear shift takes 4+ seconds, sometimes up to 10 seconds. By that time, another car has already rear-ended me, if I'm not careful.
But I love the great gas mileage I get with the newer Dexos oils. Almost 20% better on the highway, compared to dino oils.

Mine also downshifts instantly and goes, I'm tuned so it's quicker than stock, but even stock mine wasn't nearly as slow as yours. It must need a dealer reprogram or a tune to help it out.