general problems of the 2015 Infiniti Q50

The transmission speed sensor has failed needs a new valve body. It seems like a very common problem with this car and it’s a $3000 fix according to my mechanic. I think there needs to be a recall issued considering everybody on this website is reporting the same problems.

The car just slowed down super fast on freeway almost got rear ended. It would not go past 3rd gear. Poor acceleration. Could have caused a huge accident. I got it diagnosed and they said it is valve body/speed sensor/tcm and they said this is a common problem for 2015 Q50. I replaced this part 2 years ago and here we go again. Shop diagnosed and said this tcm (transmission control module which is in the transmission) but they have to change whole transmission. Everything happened all the sudden then check engine light came on.

Just over 1 week ago, I was leaving a parking lot and driving back to my home when my car wouldn't accelerate past about ~10-15 miles per hour and wasn't shifting gears. When I took my foot off the gas pedal, the gear just dropped immediately from above third to first gear and the car shook. I first noticed this when already out of the parking lot and pulling off from a median onto the road, with no engine light or other warnings. I quickly pulled into the turn lane where there wasn't traffic and turned the car off and back on. It was the same but luckily I was in eyes view of my apartment, so I drove under 10 mph and made it home. I took the vehicle to a transmission service center and the error code that came up on the computer was (p0500 - vehicle speed sensor a), which the service center said is an issue with the "valve body" inside the transmission, specifically the "tcm - transmission control module" that sits on top of the valve body. I contacted multiple Infiniti service centers and they all confirmed that the valve body for my vehicle (part# 31705-x133a) is back ordered by over a month and could be longer until they have it. They do not sell the transmission control module separately. The valve body was quoted to me for $2200 for the part alone. I attempted to install an aftermarket valve body and a new error code came up on the computer (po720 - output speed sensor circuit). I kept the original valve body and will hold onto it. Doing some more research, this appears to be a common issue with the Infiniti Q50 - [xxx] in addition to the reddit thread above, a quick google search for Infiniti error codes p0500 and po720 point to multiple sources indicating the same common experience and outcome. My vehicle has 110k miles and users in the reddit comments are also reporting the same issue with the tcm transmission control module occurring between 85k - 100k miles in all cases. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

I’m reporting issues with the valve body on a 2015 Q50. I have had to replace the valve body already at cost of $1700. Many others have had same issue as this is a common defect with the tmc part. This needs to be addressed as a recall.

Transmission, transmission valve body, speed sensors. After transmission shifting issues while traveling the interstate I had to have the car towed to the dealership. After the multi point inspection was performed serveral recommended itmes related to the ongoing performance and safety of the vehicle listed below: transmission $10,446. 65 transmission valve body $3693. 92 the diagnostic code p0720. Attached is the service bulleting stating they know this will happen and when it does here's how to fix it. Yet they have never recalled the defective transmission. When I contact Infiniti consumer affairs they simply say that they cannot help me because the vehicle does not have warranty. If I had warranty then I would not be reaching out to them for assistance in replacing the transmission.

While driving on the interstate and coming over an overpass there was unavoidable debris located in the road. Immediately after passing over the debris there was a loud noise followed by jerking and the rpm's revved up almost like the car was in neutral. I let up off of the accelerator and then tried to accelerate again. The car would not go faster than 30mph and will not shift out of 3rd gear. I had the car towed to the dealership and the diagnostic codes reflected vehicle speed sensor and there was no physical damage that was visible under the car. I was told that the problem was in the transmission and that it would need to be changed and given an estimate that totaled over $10,000. I was also told by the service advisor that this is a known issue with the Infiniti Q50. After doing researching this a common problem and the consumer is having to pay out of pocket if the warranty has ended. This incident could have ended badly while doing 70mph on the interstate and the car just quits moving. With all of the complaints that I have read over in regards to the transmission issues yet no action has been taken to investigate this problem. It is obliviously a manufacturing issue and the consumer should not have to pay out of pocket for defective transmissions. This luxury car was not a cheap purchase. Very disappointed that with so many cases an investigation has never been done. Infiniti should be held accountable and a recall should be issued for this problem. I will not stop until I can get through to someone that can help.

P07200 code came up, transmission is no good because of a cheap sensor that's impossible to fix. Seems to be very common and very inconvenient.

The valve body went bad at 164k miles. Im not the only one. On all the forums and fb groups im on, there are hundreds of valv bodys going bad on the Q50s for this general area of the year. On my facebook group I have seen 4 people in the past 2 days with theirs going out. Code p0720. Mine is being hauled to the shop right now so I dont have paperwork of replacement at this time for a few days.

P0500 vehicle speed sen/cir p0720 a/t veh speed sen/ circuit-or- output speed sensor p1574 ascd vhcl apps sensor - or lcc vhl spd sen (icc models) my safety was put at risk when the vehicle hesitated and stop changing gears while traffic was behind me. The vehicle was inspected by a local dealership which was Nissan and also Infiniti including a transmission shop named ammco. There were no warning lights that would indicate the vehicle was failing until April the 5th.

My car would not accelerate over 40 mph randomly after work. Once I noticed and tried to shift to a lower gear the car did not shift gears at all. When these things first happened there was no indicator lights on. The next morning the check engine light came on and the code pulled was p0720. After finding a repair shop to look further into the issue I was advised the car needed a new transmission to fix the issue. $4,000+ for the repair and as I google the issue I see that this is a common issue and it seems to always happen unexpectedly side note: also should be a recall on driver side blend door. . I almost died this summer due to cold air only blowing on one side in the middle of summer in 100• degree weather.

The speed sensor on car seems to have failed unexpectedly while driving over a bridge. The car would barely move and could have become a dangerous situation for multiple people had it been typical traffic. The issue seems to be that although the sensors are corrupted, the entire valve body or transmission must be replaced to solve the issue leaving the car inoperable. The car is currently at a repair shop. The engine light did come on shortly after. Please issue recall. Https://static. Nhtsa. Gov/odi/tsbs/2019/mc-10168892-0001. Pdf.

The contact owns a 2015 Infiniti Q50. The contact stated that while driving at highway speeds, the vehicle inadvertently slowed down. The vehicle failed to accelerate. The check engine warning light was illuminated. The vehicle was towed to the local dealer where it was diagnosed that a valve body replacement was needed. The vehicle was not repaired. The manufacturer was contacted, and the contact was informed that the vehicle was not covered under warranty. The failure mileage was approximately 56,000.

4/16/2023 Sunday 5pm with my wife and daughter in the car, I started the vehicle in my driveway and selected sport mode as usual. Selected reverse and backed into our turnaround then forward to the end of our driveway. Driveway is approximately 4 car lengths long with a 20 ft long apron turnaround. Almost immediately after braking at the end of the driveway while waiting for passing traffic to exit drive, vehicle suddenly accelerated and I immediately pressed the brake as hard as I could to prevent driving into passing vehicles. I could hear the tires trying to grip/spin while I was fighting to press the brake harder to hold it t back. I then panicked and selected the gear shifter to anything other than drive and it immediately did the same in reverse. After getting in into park, I immediately selected standard mode and the vehicle performed normal afterwards. There were no warning lights or anything to indicate any issues. Previously I had noticed minor intermittent issues of high rpms when slowing or braking while in sport mode but it would immediately correct itself. I have not had a chance to take it for inspection as it's now Monday morning April 17. We were all very shaken. Please advise.

The car was being driven on a normal day and while in gear and driven the car stalled and would no longer shift automatic. The car will not come out of 3rd gear. Took the car to repair shop and was told is a known issue with this model and even the transmission or transmission valve body needs replacement. Infinite will not issue recall and I have reach out to corporate on the issue the repair want 8,000 to replace transmission the car is out of extended warranty that was purchase on the vehicle I’m only the second owner of the car well maintained and should not be having this issue of a self maintained transmission with a vehicle worth 25,000 wen brought.

My car suddenly stopped in the middle of the road with a check engine light. I have a p0720 & p0500 codes indicating a vehicle speed sensor & output speed sensor failed while operating . This cause my transmission to fail and not shifting. I am on my way to the dealer now . Hopefully Infiniti will do the right thing and fix it . At 56,000 miles a transmission should not fail . Unexpectedly almost causing a car collision . No prior warning was provided by the car . The car just suddenly failed . This is a very serious safety concern .

When on the highway my transmission slipped then went out and wouldn’t accelerate, without any warning or sign of trouble beforehand. I scrambled to pull over and it started to accelerate again. It struggled to shift in 1st gear and second but despite going over 40 mph it would not shift to third gear. I could feel it slipping/sputtering when letting up on the accelerator and jerk when I press on the brakes. The engine will continue to rev high at lower speed. My check engine light came on and gave two codes, p0720 and p0500. I took this to my mechanic and he advised the valve body that houses the at speed sensor be replaced and I likely need a new transmission. On a forum for Q50s another Infiniti owner said a dealer parts manager told them that Infiniti was aware there was a problem, and that the valve body was hard to come by and part of the delay was due to them redesigning the part to assure it didn't happen again. They suggested filing a case with Infiniti in case they were to issue some type of recall or TSB. He said out of the 750+ parts that were on backorder, his was #130 in line, and it still took over 2 months to receive. If this is a known issue it is dangerous and should be addressed.

Came to a slow stop at a red light in my 2015 Infiniti Q50. My foot was directly on the brake. Within seconds the car began to pull forward and I applied additional pressure on the brakes by using both feet. The engine was racing out of control and the tires were screeching. Sifting the gears did not help. I let off the brake and turned right instead of straight in order to avoid hitting cars. Shifting violentlky the car finally went back to normal. The dealer denies the car is at fault and says this is a case of human error.

The contact owns a 2015 Infiniti Q50. While driving at approximately 30 mph around a curve with the brakes engaged, the accelerator pedal was depressed but the vehicle decelerated without warning. The issue recurred multiple times. The vehicle was towed to the dealer. The technician inspected the vehicle and stated that it was working up to standards. The failure recurred. The vehicle was not repaired. The failure mileage was unknown.