Transmission began stuttering and shifting poorly at about 114,000 miles. This is a typical symptom for a problem Nissan has known about for some time. A failure in the radiator allows engine coolant to mix with transmission fluid - destroying the transmission. So far it has cost me $1000 to have the radiator replaced and the transmission drained and refilled. $11/quart for special Nissan tranny fluid. I expect I may have caught the problem early enough to avoid major transmission damage, but will only use the truck for local trips now. This issue should be a recall issue and Nissan held accountable for repairs.

- Abbeville, MS, USA

The contact owns a 2006 Nissan Frontier. The contact stated that the transmission cooling system failed and allowed radiator fluid to leak into the transmission causing it to fail. The manufacturer was contacted about the failure. The transmission was replaced at owner's expensive. The failure mileage was 110,000 and the current mileage was 111,500. Updated 5/15/13 updated 05/31/2013

- New Smyrna Beach, FL, USA

The seal between the engine coolant and transmission fluid portions of the radiator fails, contaminating the transmission fluid with coolant water. Causing my engine to slip when changing 1st and 2nd gear. I just found out about this problem when I received a letter that there was a class action lawsuit about this problem. Nissan knew about this problem and fail to notify owner of the this problem in a timely matter. If I had known this problem then I would have replace the radiator instead of having to replace my whole transmission causing me thousands of dollars.

- Houston, TX, USA

The contact owns a 2006 Nissan Frontier. The contact stated that while driving 5 mph, the vehicle stopped accelerating. The contact stated that she turned the vehicle off and smoke emitted from under the hood area. The vehicle was towed to transmission specialist for inspection where they advised the contact that liquid from the radiator leaked into the transmission. As a result, both the radiator and the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was notified and advised that the vehicle was not under recall. The VIN was not available. The failure mileage was 111,000.

- Sherwood , AR, USA

The transmission has been compromised due to a faulty radiator. The radiator leaked coolant into the transmission contaminating the transmission fluid. I noticed the vehicle would occasionally shudder and when I had it checked out discovered the problem. Hard to believe Nissan did practically nothing to notify owners of the problem because it sure was evident that the local Nissan dealership was aware of the problem as well as a couple of transmission shops I've visited.

- Albany, GA, USA

Radiator failed causing antifreeze to enter the transmission, and transmission fluid to enter the radiator.

- Winder, GA, USA

Hasn't happened yet, but from all the complaints from 2005-2010 Nissan pathfinder, xterra and Frontier owners concerning major transmission failures while driving due to cross contamination from a failed transmission fluid line running through the radiator, it's only a matter of time. This defect has been known by Nissan for years and as a band-aid solution offered extended warranty coverage for these specific components to 8 years/80,000 miles, knowing full well most problems have a record of occurring just after 100,000 miles. Class action law suits against Nissan for this defect are now pending in the state of New York. This defect and Nissan's lack of concern for preventative action placed this in the 2nd worst problem on carcomplaints.com top vehicle problem trends of 2012 list. As more and more of these model years approach 100,000 miles, more and more catastrophic failures with potential for injury and loss of life will occur. Repair after the failure is quite expensive; enough to warrant scrapping the vehicle for those that can't afford the repair bill. Time to hold Nissan accountable for the problem they have created and allowed the public to bear responsibility for. A recall of all affected models to install an improved automatic transmission line in the oil cooler or rerouting the line to a different add-on oil cooler is needed.

- Grantsburg, IL, USA

The contact owns a 2006 Nissan Frontier. The contact stated the front end of the vehicle began to vibrate. The contact took the vehicle to the dealer and was told that the transmission lines and radiator fluid leaked and caused cross contamination into the transmission. The mechanic suggested they cut the transmission fluid line so it would go directly into the transmission fluid cooler; however, it caused the rear end of the vehicle to vibrate. The contact stated that the transmission needed to be replaced. The failure mileage was 96,000. The current mileage was 102,000.

- Cynthia, KY, USA

2006 Nissan Frontier. Consumer writes in regards to catastrophic transmission failure. The consumer stated while traveling at approximately 45 mph from home, the vehicle completely stalled in the middle of an intersection. The vehicle was towed to a repair shop, where an inspection revealed radiator fluid and transmission fluid mixed together.

- Deansboro, NY, USA

I purchased my truck with about 1900 miles on it. I was a very proud owner, doing everything in my power to keep my truck dependable and reliable by getting all scheduled maintenance plus preventative care. However, one morning I tried starting my truck for work and it wasn't cranking. Unfortunately, I decided to take my truck to a small mechanic shop and I witnessed them start an engine fire that damaged the wire harness. I quickly took my truck out of this mechanics shop and towed it to the Nissan service department. I asked the service advisor to repair the wire harness and to find out why my truck is not cranking. The service advisor explained to me that there was a recall on my vehicle because of a problem of coolant leaking inside the transmission which will damage the computer component causing the truck not to start or crank. The service advisor then continued to tell me that my truck is no longer covered for the repairs because I exceeded the allowed mileage to repair the factory defect and I have to pay for the repairs out of pocket which total more then what the truck is worth. The service advisor also revealed that I should have received a letter with details of the recall, but I never received it because it went to the previous owner. I was confident in purchasing a Nissan truck and invested all of my money toward one hoping this would be my only vehicle purchase for at least 10 years but now I have less than a year of payments left and a vehicle that doesn't run. My only mistake is that I purchase my Nissan with 1900 miles and because of that I never received my warranty or recall information which I feel this problem could have been prevented. I am asking Nissan corporation to stand by their vehicle with me and honor the recall so I can get my reliable truck running properly again.

- Corona , CA, USA

Mechanic stated antifreeze is leaking into transmission. Replaced radiator, flushed transmission.

- New Castle, CO, USA

The contact owns a 2006 Nissan Frontier. The contact stated that while driving approximately 45 mph, the vehicle stalled without warning. The contact attempted to restart the vehicle but to no avail. The vehicle was pushed to an independent mechanic for diagnostic testing, which the mechanic advised that the transmission radiator and transmission cooler needed to be replaced. The manufacturer was made aware of the failure and advised the contact that the vehicle was not included in any recalls. The vehicle was not repaired. The approximate failure mileage was 220,000 and the current failure mileage was 220,000.

- Lacombe, LA, USA

Clutch failed suddenly on an I-95 onramp, total failure including flywheel. Just this Monday, my transmission completely disconnected from the engine at about 70mph on I-676 in center city philadelphia as a result of another clutch failure. I've been driving stick my entire life and this kind of sudden failure without warning does not strike me as normal. Also, I have the fuel gauge issue where it fails to correctly register the amount of gas in my tank. I'm the original owner of this truck and I wish I wasn't.

- Philadelphia, PA, USA

My 2006 Nissan Frontier would not shift out of first gear in rush hour traffic. (latter it would not go into reverse.) I pulled off to the side of the road and turned off the vehicle, decided to try and nurse it in first gear until I got it home. It seem to work fine. My understanding after searching the internet there is a know problem with Nissan Frontier and coolant getting into the transmission.

- Stanford, KY, USA

I was making a left turn across traffic in my 2006 Nissan Frontier when I lost all forward momentum in the middle of the intersection. The truck felt like it was in neutral and would not go into gear. I was stuck in the middle of the intersection blocking traffic for about 15 seconds while cars honked and went around me. After about 15 seconds the check engine light came on and it jerked into gear. I had the code check and they said it was a fault in the transmission. I did some research and found out about the faulty radiator problem that could allow coolant into transmission. I checked my coolant for signs and sure enough I had grey sludge floating all in my coolant which is a sign of cross contamination. I called a local aamco (transmission mechanic) to ask him about it and he knew all about the issue and said he rebuilds at least one Nissan transmission a week due to coolant destroying the transmission. He recommended that I bypass the radiator cooler right away and change the transmission fluid in order to reduce damage. He said that since it has already shown since of contamination that it was just a matter of time it failed again and for good. He said a rebuild would cost between $3K & $4K, which is something I cannot afford. I am scared every time I have to cross traffic that it will fail and I will be in a serious accident. Why would Nissan ignore fixing this issue while it was minor and allow its customers the possibility of being in a serious accident much less making them pay thousands of dollars that many do not have to fix a safety issue.

- Elk Park , NC, USA

My Nissan was having issues so I took it to my mechanic. He informed me that Nissan was having an issue with a part that wore out and leaked coolant into transmission and transmission fluid into the radiator. I called my local dealership to see if it was recalled. They informed me I was a few thousand miles over my warranty and they could do nothing. I then saw the multitude of complaints about this issue and the dealership said Nissan paid for some vehicles out of warranty. That alone proves they knew about this issue. I paid for a new radiator ($600) and hoped for the best with my transmission. I am in the navy so I can't afford to replace the transmission. Now my luck has run out and I can no longer drive my vehicle. I have a 3 month old at home and need to have two cars for my wife. This is an issue Nissan knows about and it is due to a faulty part they installed. It could have been fixed ahead of time and solved a lot of issues. When is there going to be a recall" people are getting stranded and Nissan and the government knows. Does someone need to die for you to notice and act" it would seem that people being stranded and spending thousands of dollars because of a manufacturing defect is not enough. I need to know if I have to go try to buy another car or wait and hope my government protects us.

- Waldorf, MD, USA

Coolant fron radiator entered transmission causing shuttering. Vehicle was brought to Nissan for repair. Engine coolant had entered the transmission causing failure to transmission. Coolant system was replaced and transmission was flushed. After 5000 miles the transmission had completely failed. The failure occured while attempting to accelerate from a stop sign in a dangerous intersection. The vehicle was stuck in 4'th gear. I accelerated from the stop sign but the vehicle would barely move leaving me exposed in a dangerous situation. A vehicle almost T-boned me as it came around the blind corner. Nissan has known about this defect for a long time. If I had known I could have replaced the coolant system before it entered the transmission. Now I am stuck with a bill of more than $5000 after already spending $2000 on a new coolant system and numerous transmission flushes. In my opinion Nissan neglect in notifying and remedying this defect is placing its custumers at great risk of injury and death due to this sudden loss of power.

- Cheshire, CT, USA

The contact owns a 2006 Nissan Frontier. The contact stated that while driving 38 mph, the vehicle began to shake. The vehicle was taken to a transmission shop where they stated that the core in the radiation failed and the anti-freeze had spilled into the transmission and destroyed it. Consequently, the transmission would need to be replaced. The vehicle was not repaired. The manufacturer was not notified. The failure mileage was 130,000. The VIN was unavailable.

- South Paris, ME, USA

My 5-speed automatic 2006 Nissan Frontier's radiator cooler tank ruptured forcing coolant into the transmission through the transmission cooler lines causing "catastrophic failure" at 92000 miles on the odometer (12000 miles outside the extended warranty on the faulty radiator). This is apparently an "uncommon", but known problem with Nissan truck and SUV models. I was traveling at 65 mph on interstate 70 near frederick, Maryland when the transmission failure occurred. I lost all forward momentum but was able to maneuver the truck to the shoulder before causing an accident. I had it checked by an independent shop in mount airy, Maryland and they quoted the replacement of the radiator and transmission at $4350. After making inquires with the Nissan dealership where I bought the car new in 2006, their initial estimate was between roughly $6000 - $10000 for replacement of the radiator and transmission! they were able to negotiate down with Nissan corporate and the final cost of replacement of the radiator and transmission was $3000. My transmission failed without any sign or warning at 65 mph on a 3 lane interstate - the financial burden to fix the problem hurts, but it could have gone much worse.

- Mount Airy, MD, USA

Transmission/radiator failure resulting in mixed transmission fluid and coolant. I have just discovered this since I was having transmission problems. This is a known problem and a quick fix if I had just known about it. Many are bypassing the transmission cooler due to this problem. A quick internet search shows this is a known problem and pervasive.

- Colorado Springs , CO, USA