Applies to 2010-11 G37s with 7AT. It just became available May 15, 2012. They might expand it to 2009, but they haven't yet.

This update is great - had mine done 200 miles ago. Really improves the transmission a lot. Throttle is much more responsive. Low end torque feels improved. Acceleration lags are gone/reduced. Coasting is much more smooth (much less engine braking). There's a big thread about it on the Sedan board.

The update is free while you are still under the new-car warranty. It might even extend as far as the powertrain warranty which is longer. There's no way for the owner of the car to see if it was done already.

This is not a "recall", so after the warranty is up, they are not required to do it for free.

Just tell your dealer you observed one of more of the following:

1. Harsh Downshifts when coasting to a stop;
2. Hesitation/lag when accelerating after coasting;
3. Hesitation/lag when accelerating out of a rolling stop;
4. Engine rev matching during moderate to heavy braking.

 

Called the dealer today to make an appointment to have this done. I was told that some ECM wasn't able to be reprogrammed and had to be completely replaced? HUH wth...Can you please shine some light on this. Thanks.

 

New one on me. Sounds like a dealer who doesn't want to do warranty work. Is your G a 2010 or 2011?

Post this in the Sedan thread on this fix. It's 100 pages long. People are getting it done right and left. Maybe someone there has had the same experience as you.

 

It's too bad 09's are excluded from the TSB :s

 

That's what bothers me the most. As far as I know, it is the same tranny. Why wouldn't they extend it to the 09? Smells like a call to consumer affairs to give them a nudge!

 

Sometime last year I complained to the dealer that my transmission was shifting poorly so he checked and found out there was a transmission module program update available so he did it and it drove 100% better. I have a 2009 S coupe.

 

that was the old update. While it helped a little, it was still pretty bad. this new update is night and day difference.

 

Good to hear! Hmmmm, I wonder if they reflash the whole ECU or just a "transmission module". May mess up my uprev tune.

 

It WILL mess up your UpRev. You need to flash back to stock. Then the question arises, will they flash it with a new ROM? Then your tuned ROM is no longer useable.

 

I wonder how this TCB compares (or relates in any way) to ITB10-075 - transmission shift issues and/or A/T DTC stored

 

ITB09-032B is the 4-3 downshift harshness tsb, doesn't seem to do anything w/ lag, atleast not for me :s

 

Thanks for posting this. I'll be making an appt for my '10

 

Dropped the car off this morning at Infiniti San Francisco, for an oil change and ITB10-075 and ITB12-027. Specifically told them that I can replicate rough 2->1 shift, RPMs going up by ~200 when 4->5, and hesitation when accelerating after coasting. This should cover both TSBs. The advisor said they'll update the TCM if necessary - hopefully they consider it necessary.

 

If anyone hasn't done it yet, I highly recommend it. The improvement is quite noticeable.

 

I have a 2011 xS Coupe,
I know it mentioned in the title it's only for the G37S models with 7AT.
just wondering if it applies to 2011 xS coupes with 7AT