2007 G35x automatic transmission problem?
Just took a ride in my friend's 08.
His has the most minor of blips at 3,500 as well.
I'm not totally concerned about this right now. I don't know what it is, but we're not alone if it becomes an issue down the road.
His has the most minor of blips at 3,500 as well.
I'm not totally concerned about this right now. I don't know what it is, but we're not alone if it becomes an issue down the road.
Registered User
Joined: Dec 2009
Posts: 29
Likes: 1
From: Vancouver, Canada
Hi folks,
I purchased my used, certified, 2007 G35x 5AT sedan two weeks ago with 20,200 miles on the clock. Since then, I’ve been getting more accustomed to the car and have noticed something things I consider unusual with the transmission.
First off, when the car shifts from first to second, regardless of how aggressively or mildly driven, it has a very drawn out shift, with little crispness involved.
Secondly, when the tachometer hits ~ 3,500-3,600 RPM, there is a “hiccup”, "bump" or slight “slip” in the tach, which can also be felt in the seat of your pants. I played with this last night for over an hour, driving all around town using the manual shift mode, and it is more noticeable in second and third gear, but can be observed in all gears (including fifth, which means I was fracturing a few laws). Having owned a car that had a slipping tranny, this feels just like it’s trying to slip, but once I pass this level in the tach, it’s gone, and all seems normal. So if I’m accelerating hard, it hits this spot in the tach, does the “bump/slip” (literally a fraction of a second), then back to smooth. If I’m trying to hold the tach at the point where the “bump” occurs, it’s more noticeable since the engine speed is not quickly taking me past the point in which this issue occurs, if that makes sense.
In any event, I’m concerned since neither of these things seem characteristic of any auto tranny I’ve ever driven. BTW, I experience both issues regardless of whether I’m using manual mode or let the car shift on its own; I just found my experimentation easier to observe using manual mode since I could more easily control the engine speed.
From what I know, the car was well maintained and I do know it was a one-owner car, purchased, serviced, and traded in all at the same Infiniti dealership in Denver (I'm 400 miles south in Albuquerque). I was considering changing out the ATF to Amsoil myself, but until this issue is past me and resolved, I won’t touch a thing on the car so I don’t jeopardize my warranty.
The specific questions I have for all of you is if you have experienced this, and perhaps if you’d take your cars out in the next few days and, using manual mode, experiment with the 3,200-3,800 range on the tach to see if you notice anything like I’ve described and then post your findings? Also, if you can comment on the first to second gear lazy, soft shift, I’d really appreciate your comments on that, as well. Any other comments you may have are also appreciated.
Unless you all are feeling and seeing what I am with both “issues”, I plan to call my local dealer on Monday for an appointment to have the car checked out.
Thanks, and my apologies for the longwinded post.
Joe
I purchased my used, certified, 2007 G35x 5AT sedan two weeks ago with 20,200 miles on the clock. Since then, I’ve been getting more accustomed to the car and have noticed something things I consider unusual with the transmission.
First off, when the car shifts from first to second, regardless of how aggressively or mildly driven, it has a very drawn out shift, with little crispness involved.
Secondly, when the tachometer hits ~ 3,500-3,600 RPM, there is a “hiccup”, "bump" or slight “slip” in the tach, which can also be felt in the seat of your pants. I played with this last night for over an hour, driving all around town using the manual shift mode, and it is more noticeable in second and third gear, but can be observed in all gears (including fifth, which means I was fracturing a few laws). Having owned a car that had a slipping tranny, this feels just like it’s trying to slip, but once I pass this level in the tach, it’s gone, and all seems normal. So if I’m accelerating hard, it hits this spot in the tach, does the “bump/slip” (literally a fraction of a second), then back to smooth. If I’m trying to hold the tach at the point where the “bump” occurs, it’s more noticeable since the engine speed is not quickly taking me past the point in which this issue occurs, if that makes sense.
In any event, I’m concerned since neither of these things seem characteristic of any auto tranny I’ve ever driven. BTW, I experience both issues regardless of whether I’m using manual mode or let the car shift on its own; I just found my experimentation easier to observe using manual mode since I could more easily control the engine speed.
From what I know, the car was well maintained and I do know it was a one-owner car, purchased, serviced, and traded in all at the same Infiniti dealership in Denver (I'm 400 miles south in Albuquerque). I was considering changing out the ATF to Amsoil myself, but until this issue is past me and resolved, I won’t touch a thing on the car so I don’t jeopardize my warranty.
The specific questions I have for all of you is if you have experienced this, and perhaps if you’d take your cars out in the next few days and, using manual mode, experiment with the 3,200-3,800 range on the tach to see if you notice anything like I’ve described and then post your findings? Also, if you can comment on the first to second gear lazy, soft shift, I’d really appreciate your comments on that, as well. Any other comments you may have are also appreciated.
Unless you all are feeling and seeing what I am with both “issues”, I plan to call my local dealer on Monday for an appointment to have the car checked out.
Thanks, and my apologies for the longwinded post.
Joe
JC68, have you been able to resolve this issue?
Thanks
Sorry for resurrecting a year old threat, BUT, I am having this same damn issue that is really pissing me off. When in manual mode on my 07g35x in 2nd gear, if I bring it up to about 3,500-3,750 rpms i have this little blip as well- almost feels like it is moving into the second half of a power band if that makes any sense. Kind of seems like my 2nd gear has a bit of a stutter. When I'm in manual mode and on it hard from 2nd to 3rd gear, BAM, sometimes it'll slam into gear entering 3rd and is very noticable to all people in the car.
From about 35-45 mph if I am coasting, it feels like the car is shuddering as well. The mechanic at Infiniti of Nashua, NH told me that most of these cars will have this, and it is the torque converter going in to lock up mode at that spead. If i maintain that speed it is right at a shift point, and he recommends dropping it into 3rd gear if i'm staying at that speed for a while.
Also said it is the cars management system going into overdrive to save fuel. WTF is he talking about? I think something is wrong and he is ducking out on some warranty work. Can anyone with some more experience chime in on this? 
If i wanted a car that drives like a piece of **** i would have bought one!! I might bring it to the Kelly dealership here in Mass to have this looked at as well.
*EDIT* Found this- i'm going to call the dealer on this one.
ITB07-030
2006–2007 INFINITI G35; SHUDDER AT 40 MPH
The vehicle has a shudder when the transmission is at operating temperature and the torque converter is:
• Engaging lock-up in 5th gear (light acceleration at 40 mph)
• Releasing the lock-up in 5th gear (coasting at about 40 mph)
NOTE: CONSULT-II (2006 models) or CONSULT-III (2007 models) can be used to confirm
transmission gear position and lock-up condition.
From about 35-45 mph if I am coasting, it feels like the car is shuddering as well. The mechanic at Infiniti of Nashua, NH told me that most of these cars will have this, and it is the torque converter going in to lock up mode at that spead. If i maintain that speed it is right at a shift point, and he recommends dropping it into 3rd gear if i'm staying at that speed for a while.
Also said it is the cars management system going into overdrive to save fuel. WTF is he talking about? I think something is wrong and he is ducking out on some warranty work. Can anyone with some more experience chime in on this? If i wanted a car that drives like a piece of **** i would have bought one!! I might bring it to the Kelly dealership here in Mass to have this looked at as well.
*EDIT* Found this- i'm going to call the dealer on this one.
ITB07-030
2006–2007 INFINITI G35; SHUDDER AT 40 MPH
The vehicle has a shudder when the transmission is at operating temperature and the torque converter is:
• Engaging lock-up in 5th gear (light acceleration at 40 mph)
• Releasing the lock-up in 5th gear (coasting at about 40 mph)
NOTE: CONSULT-II (2006 models) or CONSULT-III (2007 models) can be used to confirm
transmission gear position and lock-up condition.
Last edited by stevec1129; Jan 29, 2010 at 08:04 AM. Reason: more info
Registered User
Joined: Dec 2009
Posts: 29
Likes: 1
From: Vancouver, Canada
stevec1129,
From my research, this seems to be normal charcteristic of the G's. I spoke to a friend that has a 04 and another with a 06 G and they had spoken to their dealers about the hard manual shift in the lower gears. There is a software upgrade but I have not heard if it fixed the issue. However, when driving normally, there is no noticeable signs of hard shifting. Seems to happen when driving it hard in manual mode only.
Also, I haven't seen many tranny replacements on this forum. Coming from Honda/Acura, that is a very good sign!
Let me know how it goes.
From my research, this seems to be normal charcteristic of the G's. I spoke to a friend that has a 04 and another with a 06 G and they had spoken to their dealers about the hard manual shift in the lower gears. There is a software upgrade but I have not heard if it fixed the issue. However, when driving normally, there is no noticeable signs of hard shifting. Seems to happen when driving it hard in manual mode only.
Also, I haven't seen many tranny replacements on this forum. Coming from Honda/Acura, that is a very good sign!
Let me know how it goes.
I took the tech from Infiniti out on a drive and he definately noticed the hiccup at 3,500 rpms too. Said he could feel a bit of a shutter at times around 40 mph and recommended the 'Throttle Sensitivity Bulletin.' I declined this update for the time being since I have heard nothing but negative things regarding this update. They gave me an 08 for the day and it felt a little bit more sluggish than my car, but didnt seem to have the jumpiness in traffic like my 07 does.
The result of my visit to the dealership, they told me there is no mechanical problem with my car. BS, I know for sure so I might just keep bringing it back until they find a resolution to this garbage.
The result of my visit to the dealership, they told me there is no mechanical problem with my car. BS, I know for sure so I might just keep bringing it back until they find a resolution to this garbage.
Thats ok.. Drive it till it blows up.. My tranny is all over the place I also have the shutter at 40MPH and I smell antifreeze and tranny fluid outside the car( When I drive for long periods of time or spirited). they kept telling me there was nothing wrong. My car is a lease and I'm just gonna keep driving it and if it blows up then and only then will they replace something.. To bad to hear of your issues, But I have been dealing with mine for over a year. 
yeah mine isnt a lease and this isnt the end of it believe me. I wonder if the throttle sensivity issues can be minimized by adding an R2C and a tune like i plan on doing. Hmmm. anyone have any thoughts on this?
Registered User
Joined: Sep 2007
Posts: 654
Likes: 8
From: NY
I took the tech from Infiniti out on a drive and he definately noticed the hiccup at 3,500 rpms too. Said he could feel a bit of a shutter at times around 40 mph and recommended the 'Throttle Sensitivity Bulletin.' I declined this update for the time being since I have heard nothing but negative things regarding this update. They gave me an 08 for the day and it felt a little bit more sluggish than my car, but didnt seem to have the jumpiness in traffic like my 07 does.
The result of my visit to the dealership, they told me there is no mechanical problem with my car. BS, I know for sure so I might just keep bringing it back until they find a resolution to this garbage.
The result of my visit to the dealership, they told me there is no mechanical problem with my car. BS, I know for sure so I might just keep bringing it back until they find a resolution to this garbage.
The 08 you drove has the ECU spec similar to '07 with the update applied, so it's up to you to decide whether it is something you need or can live without.
Registered User
Joined: Dec 2009
Posts: 29
Likes: 1
From: Vancouver, Canada
Thats ok.. Drive it till it blows up.. My tranny is all over the place I also have the shutter at 40MPH and I smell antifreeze and tranny fluid outside the car( When I drive for long periods of time or spirited). they kept telling me there was nothing wrong. My car is a lease and I'm just gonna keep driving it and if it blows up then and only then will they replace something.. To bad to hear of your issues, But I have been dealing with mine for over a year.
dohturdima, did the ECU update get rid of the shuddering at 40mph, if you had it to begin with? Thats the only reason i'm considering getting it done really. It also seems to shift at weird points but I've been told that if i reset my ECU after i put in my new intakes, and then go ***** to the walls for a while it will re-learn my driving. I bought this car 6 months ago and it was driven by a woman in California.
Here's the link for how to deal with shuddering around 40mph. This worked and I'm still happily driving with no problems:
https://g35driver.com/forums/g35-sed...ph-60km-h.html
https://g35driver.com/forums/g35-sed...ph-60km-h.html
Johnny you have an 08, so i believe the update for you would have been different than my 07, as this update makes the throttle/transmission in the 07's drive like the 08's. I've sent out a few PMs to see if the ITB08-017 fixes this; would you happen to know?
I thought about that already...
Please read the first post of that thread I just posted. I specifically outlined which update takes care of the 07's and which one takes care of the 08's. I intended that thread to be the end all be all of shuddering at 40mph. Feel free to print out the thread and bring to your dealer, they should be convinced.
In fact, "Treacherous" was the big help with this
and should be endlessly thanked for the kick ***, no shuddering ride I now have 
edit: to make life easier
Here's the info you need from that thread:
An update:
Went to the dealer, they said the couldn't feel the problem. Came back in, went for a drive myself with the service manager and I was able to reproduce the shudder on a road where I remember it always happening. The manager agreed that it wasn't normal and I suggested to him that a member here (treacherous) fixed the issue with an ECU reflash with newer software<--Thanks Treacherous!
So I gave the manager the TSB for the '07s for the "throttle sensitivity - ITB08-017a", seeing as it involved reflashing ECU to newer version software. This didn't apply to my 08 as I apparently 08s have a whole different revision of software. ie: no JK69_a,b,c,or d in the software version number). Those with 07s, just for your reference, the latest flash is 23710-JK69D to fix this issue.
So for those with the 08 as opposed to the 07, the latest flash version is # 23710-1NA8C. The old version I had was 23710-1NA8A.
So now for the driving experience...I felt no difference in respect to throttle response, shifting, etc. The car drove pretty much exactly as it did when I brought it in. I guess the 08's never had that touchy throttle in the first place. Driving home, I felt no shudder at 60 (VERY EXCITED). I decided to wait for the girl to come home and we went out for a nice long cruise, holding 40mph (60kmh) as much as possible...no shudder, even on the same road that would almost guarantee it to shudder.
Guys, I think I nailed it. It's been a great day, the dealer was great to deal with and the car drives smooth as it should. I'll chime back in a couple weeks to update if all's still good, but appears that the reflash fixed it.
Thanks again to Treacherous for the help, I don't think they believed it themselves that the ECU reflash would fix the problem.
I'm now a more happier G driver!
Went to the dealer, they said the couldn't feel the problem. Came back in, went for a drive myself with the service manager and I was able to reproduce the shudder on a road where I remember it always happening. The manager agreed that it wasn't normal and I suggested to him that a member here (treacherous) fixed the issue with an ECU reflash with newer software<--Thanks Treacherous!
So I gave the manager the TSB for the '07s for the "throttle sensitivity - ITB08-017a", seeing as it involved reflashing ECU to newer version software. This didn't apply to my 08 as I apparently 08s have a whole different revision of software. ie: no JK69_a,b,c,or d in the software version number). Those with 07s, just for your reference, the latest flash is 23710-JK69D to fix this issue.
So for those with the 08 as opposed to the 07, the latest flash version is # 23710-1NA8C. The old version I had was 23710-1NA8A.
So now for the driving experience...I felt no difference in respect to throttle response, shifting, etc. The car drove pretty much exactly as it did when I brought it in. I guess the 08's never had that touchy throttle in the first place. Driving home, I felt no shudder at 60 (VERY EXCITED). I decided to wait for the girl to come home and we went out for a nice long cruise, holding 40mph (60kmh) as much as possible...no shudder, even on the same road that would almost guarantee it to shudder.
Guys, I think I nailed it. It's been a great day, the dealer was great to deal with and the car drives smooth as it should. I'll chime back in a couple weeks to update if all's still good, but appears that the reflash fixed it.
Thanks again to Treacherous for the help, I don't think they believed it themselves that the ECU reflash would fix the problem.
I'm now a more happier G driver!