Problems with 2009 Infiniti G37 POWER TRAIN

Between 40-50 mph, on a busy rural highway, the car would occasionally (once in 3 months) go into limp mode. this problem is now occurring weekly! you cannot accelerate more 2,000 rpms when this happens. you can manually shift the transmission to a higher gear to get to a safe spot to pull over. however, it feels like the transmission might fall out of the car when shifting. most of the time, when you cut the car off and restart it, it runs as normal. it's like the computer resets. as of late, i have to cut the car off and restart twice. this is beginning to happen more frequently, like once or twice a week. we have consulted with a dealer, and have tried several recommendations. we have new air filters and mas air sensors. this did not correct the problem. after further investigation, we found a dealership who admitted that they have seen or heard of this problem. the service advisor said that this could be a transmission issue. we have an appointment on 12-13-2019 with this dealership.

Infiniti needs to recall the timing chain galley gaskets. my 2009 g37xs sedan recently blew the galley gaskets and it seems as if this is a common problem and is a very expensive fix. recall this issue please i always use 93 gas. always use mobil 1 full synthetic oil, and always do all maintenance on the car on time. i'm shocked and aggravated that this issue happened and infiniti did not recall it.

I was on the highway traveling about 60-65 mph and a truck merged, i slowed then decided to pass as it was a larger type truck and slow to merge, when i stepped on the gas...nothing happened. the vehicle seemed to have gone into neutral like space and i had no gear and i was half in the passing lane. i have an automatic transmission. i took my foot off the gas and it finally appeared to catch, but i thought i was going to crash. i did have shift and lag issues and just got a tcm update 05/25/2019 which appears to have solved the other problems, but i am afraid to pass on the highway because i am not sure if this issue was the same as the lagging at lower speeds and rough downshifting.

I was coming out from the freeway at the traffic light the car completely shutdown, and it will not start. first i called for aaa to tow it, once he came the driver checked the battery and he told me the battery was fine, then he told me the engine is gone. and then i called the dealer to check if this is a recall, or anything and i was told the power train was expired. i have no indication of any heating, or any engine lights, everything was working fine. i do the maintenance as recommended by infinity book. the this vehicle has low mileage 2009 year made and i don't drive much. i searched online and there are so many people suffer exactly like me.

On a cold snowy evening while driving on the highway at about 60mph the car began to violently shake, when i took my foot off the gas pedal the car stopped shaking, when i tried to accelerate the car again began to shake violently. fortunately i was about 5 miles away from my destination and managed to drive about 25 on a highway. after i reached my destination i powered off the car and let it sit for about 5 minutes, then i powered it on again and tried to accelerate above 30mph which caused the car to shake again. i ended up getting the car towed to the dealership, when i got a call back from the dealership the next day, the mechanic said that the problem was due to a software issue with the car. during the cold weather the air intake was not taking in air correctly which was causing the engine to misfire. i was a bit skeptical about what happened but since then i have not had the issue occur again. infiniti should make this information known to owners either through a recall or update the software during routine maintenance. *tr

2009 infiniti g37. consumer writes in regards to vehicle transfer case problems. *smd the consumer stated for the second time in one year, a problem developed with the transfer case. the dealership indicated, they did not know how the problem developed, or why it occurred again. the consumer was informed the parts were not available in the us and wouldn't become available until mid october.

Car buck and stop accelerate. then will not go in to low gears or six gear. *tr

Pulling into parking stall (brakes applied / traveling 5-10 mph) the car lurched forward twice and stuck a parked full size truck. the car bounced backwards and lurched forward again and stuck the truck a second time and bounced backwards again. the ( off button) was able to be pushed at that time. the brake was fully applied the entire time. this has been the only occurrence. infinity has not been able to duplicate problem and has downloaded the data base. the formal report will take approx. 4 weeks to complete. no parts have been replaced. infinities consumer's affair has told us to pickup the vehicle and drive the vehicle despite no explanation or written proof the vehicle is safe to drive. the problem is related to either braking, acceleration or both. *tr

Apparently on 2009 infiniti g37s, there is a programming error/deficiency in the electronic engine control module (ecm) affecting the processing of the mass flow rate sensor that will cause the engine to unexpectedly (and without a dash warning indicator) to lose power. at occurrence of the failure, the car will decelerate from highway speed to less than 35 mph within a few seconds. following the failure, the engine rpm will not exceed 2,400 rpm and speeds above 35 mph are impossible (i found that 4th gear is the highest gear selectable). this failure can be dangerous in a number of traffic situations. i have learned from an infiniti service dept. that the failure will temporarily correct itself if the engine is turned off for a period of time, but that the failure could reoccur. the car's ecm was re-programmed by towbin infiniti (las vegas, nv) on august 30 and that supposedly fixes the failure. while at towbin, the service man said that infiniti knows of the problem, but is waiting to see how wide-spread the problem is. owners have not been told of this problem. towbin service said they have seen about 300 cases of the problem. a salt lake city dealer service dept. had also heard of this problem. again, i feel this problem can be dangerous, because: if it were to occur in heavy traffic, it may be difficult to get out of the way of others; if it were to occur when turning in front of oncoming traffic; after it occurs, there is no way to keep up with higher speed traffic - one is left going slow and hoping no one rear ends me; without more information, i have no way of knowing if the problem has really been fixed. *tr

2009 infiniti g37x coupe is experiencing dangerous surges in acceleration upon braking, the transmission is jerking and going into "fail safe mode" (meaning suddenly the car is stuck in the highest gear), the rear differential is clunking and jerking as if the car is going into awd mode at times it should not be, and quite frankly i am now becoming scared of the car. it has 3800 miles on it. i took it into the dealership on friday and was told there are a couple of known issues with the transmission but no fix. they also are calling hq on monday to talk about it. i do not want to leave my car to be driven around erratically as they try to "break" it as that will cause further damage to the transmission and engine as well as put more miles on the car. infiniti service agreed that remapping the computer would most likely take away the specifications of the car which are what they market and i bought the car for (horsepower, acceleration, "same as a bmw". if they have to gut the power of the car to fix the problem, i feel this is false advertising and the car is not what i contracted to purchase. i am on the verge of watching my resale plunge before the car is even six months old and believe infiniti should have to replace the vehicle. this problem is happening repeatedly everytime i drive the car. see notes below: 1. central computer clearly failing - had to be restored yesterday. 2. reaf diff clunking in and out of awd loudly and with a jerk and at unexpected times 3. surging rpms as much as 5000 upon driving 4. surging rpms and acceleration upon braking (3000 rpm) 5. hanging instead of downshifting 6. very jerky downshifts 7. tranny went into failsafe at least 3 times now (meaning no gear below 5th is available at any time). *tr

The manual transmission in my 2009 infiniti g37s started grinding gears nearly every time the transmission was placed in 6th gear. this resulted in longer than necessary gear changes at high speeds and prolonged time with only one hand on the steering wheel. the car was never driven excessively rough. this problem started at ~6000 miles on the odometer. at ~8500 miles, i took the car in for repair. infiniti replaced the transmission with a new transmission under the factory warranty at no cost to me. *tr

I own a two-month old infiniti g37x. when braking at highway speed, the engine does not seem to slow down as fast as it should. i brought this to my infiniti dealer this week. they conducted tests on it and found that it "performs as designed." however, they acknowledged that the transmission does not slow down when the brake is applied - that the engine is designed to "click down" from gear to gear. but when braking hard at a highway speed, the car does not slow down immediately because of this design. i've been driving for 33 years and have never before felt like the car was not going to stop when it needed to. this car gives me that feeling. i've had to stop quickly a couple of times on the highway and i did not feel as though i was in control of the car. infiniti's tests seem to confirm this. however, they did not offer any sort of repair because, again, the car is reacting as designed. they did say that a software correction might occur in the future because corporate infiniti is aware of this problem. *tr

We picked up our brand new infiniti g37 sedan out of town (52 miles on it) and the next day, drove it home 300 highway miles. obviously, we were extremely fortunate the problem didn't begin on the trip. by the second day, the car started dying when we came to a stop. at first, the problem didn't happen every time we slowed down, and we discovered putting the car in neutral proved helpful. we hoped it was a fluke that would quickly abate. unfortunately, by the next day, the problem worsened, and the check engine light went on. we took it to the local dealer, and with infiniti, they determined the torque converter was locking, and the car needed a new transmission/drive train - apparently, they found a po744 error code. this is our 3rd infiniti, and we've never had a single mechanical problem with the others, and both dealerships (the one we purchased from and the local one handling the service) claimed they'd never seen anything like this on a new car. i'm afraid what might have happened had we needed to stop suddenly in traffic. to reinforce the magnitude of this problem, the warranty repair estimate (thus far) stands at $11,000 (retail would be $16k+). in light of how significant the problem, i'm scared to drive a vehicle which immediately required this type of repair. infiniti's consumer assistance department has turned the file over for review but will only look into whether the situation qualifies for replacement under applicable lemon laws. they won't consider owner loyalty or problem magnitude of the problem, and i remain very concerned about future safety. *tr

2009 infiniti g37x coupe. 1st gear is exceptionally slow and causes dangerous acceleration problems in certain situations. the transmission jerks when up or down shifting. when i took my car to infiniti for service i was told that infiniti hasn't released a software update or recall for this problem yet but that they've been receiving numerous complaints about the problem. *tr

There is a problem with my transmission in my infiniti 2009 g37 sedan journey. it accelerates on it's own. it happens about once or twice a week. i have taken it to the dealership, they said they did what they could. it got a little better, but the problem still persists. *tr