G37x transmission disengaging at speed!!

[ludoZici]

Hi everyone,


I have an '09 G37x, 34k on it. Several weeks ago the car went into a bit of a meltdown, I was at speed (60 mph), it began to jerk violently then suddenly the transmission simply disengaged from the engine, the engine revved and I coasted to the side of the road.

I threw it in park, back in drive, the car just jerked and shuddered, dropped it into manual mode, couldn't get it to go in any gear except fifth and was unable to get the car to go above 2500 rpm without it shuddering and jerking violently.

Got it to the dealer whereupon they diagnosed it as a software issue and updated it accordingly. I left for the eastern shore at 9 am that morning, 2 hours later the exact same thing happened.

I returned the car to the dealer who kept it for several days, eventually defining the problem as a bubble in transmission fluid.

Well, it happened again over the weekend, this time at 70 mph in the middle of traffic, the car lurched forward, the transmission disengaged, the engine revved, and I had to navigate the car to the side of the road.

It's back at the dealer. At this point the car is simply unsafe, I'm not comfortable driving it, and they're talking of replacing the transmission. Has anyone else experienced this?

Infiniti corporate is now involved, and the dealer is now claiming the problem is with a failed MAF sensor which causes the bucking and jerking, however, this does not explain, or resolve, the bigger issue of the transmission disengaging entirely. I know the difference between a hobbled car in 'drive' and one that is suddenly in 'neutral' but they don't seem to get that.

[joe603]

Welcome to NICO!

Sorry to hear about your troubles. However, I'd believe the MAF sensor. The electronics in modern vehicles have a huge effect on everything, including the transmission. Give the sensor replacement a chance. If that doesn't work, I'd look into the lemon law for your state.

[kmckis1029]

+1

sounds like your car went into "limp mode"... which is usually caused by a bad sensor. I'd ask for both MAF replaced at the same time, for your peace of mind.