Hello:
Last week, Infiniti told me I need to replace my Cat Converter Bank 2 for an easy $2400. I refused to get them to replace it at that time. A few days ago, my gas pedal stop working while driving on the highway. Truck was cruising at nice speed and when trying to accelerate nothing but you can hear it trying to accelerate. So pulled car to side and parked to have it towed to Infiniti. Now they say they are getting internal codes for the transmission but none for the cat converter 02 sensor bank 2 and immediately asked if I wanted to trade my car in.

Could this be a bad transmission? OR could it be bad sensors triggering transmission codes but not necessarily a transmission issue?

Any relevant help, opinions or suggestions are welcomed.

Thanks

First step would be to buy your own OBD2 scanner. Trying to rely on a dealership to service a nearly 9 year old car is going to be frustrating.

Could definitely be something else going on, not necessarily transmission.

Recommended reading: https://www.yourmechanic.com/article/p0 ... ahl-walker

Time to order a scanner (honestly, anyone who owns a car and isn't independently wealthy should own one, if not two). Here's the one I have:
https://www.amazon.com/6030P-Diagnostic ... ive&sr=1-4

Gracious! I will definitely take a read at the article and invest in the scanner.

Did the dealer tell you which codes they found? I would explore all options before before trading the thing in. I'm not saying they are throwing down some BS about the transmission just saying you need to verify. When we were researching the QX60 we did find some transmission issues with the '13, '14 and maybe the '15 model years. At least get a second opinion.

Hi Cmoore:

No, they did not express the codes directly to me but he was insistent on me buying a new car and trading mine in. Throughout a 20 minute convo about the transmission and my options, the service technician mentioned trading in my car at least 4 times. I am going to invest in an OBD2 scanner and run the codes myself and research them. This is the first major issue I've had with the truck and sadly I am not ready to part with it. NOT TO MENTION ITS PAID FOR - who wants a car payment when you don't have to have one.

thanks again I appreciate your advice and will do some research.

^ THIS.

Tell your dealer to eat sh*t and die. I hate those bastards.

EXACTLY!!!!! I am with you on that one

I can't stand dealers. They try every trick in the book to sell cars. Like I said the transmission may be shot but that needs to be verified. People are hanging on to cars longer than ever before which creates even more pressure on dealers and their sales people to move new inventory.

Was the check engine light flashing when the accelerator stopped working or it stopped accelerating? Perhaps the car was in limp mode. But yes, get your own ODBII reader. I got a $50 one on Amazon that is Bluetooth capable and then bought the 'Torque' app on my Android phone for $5 and can read my codes on my phone. It also gives me the ability to see all sorts of parameters like air temps, oil temps, voltage, etc. in real-time.

If the only code that comes back is a P0420 or P0430 (which should be the Catalytic converter codes), then you can modify your exhaust for $50 to get past those two codes. Here is my thread for my M56 where I did that:

howto-p0420-p0430-workaround-fix-m37-m5 ... 66-30.html

Note: I believe a fully clogged/bad cat can cause all sorts of performance/power issues. AZ, can you confirm my understanding is correct?

Hi All:
I have an update. I ordered the OBD2 scanner AZ originally suggested I get. I just ran a scan and the codes I received are P0720 (AT Vehicle Speed Sensor) and P0500 (Vehicle Speed Sensor 2/Circuit MTR).

With it being two sensors do you think I still should invest in a reman transmission? OR is this premature...just replace sensors? Do you know if these sensors are in the transmission?

I truly appreciate all of your expertise, experiences and help. I have been pulling my hair out. I also see Nissan has/had major class action lawsuits with these transmissions.

Thanks again
April

I'm not familiar with those codes but if you look through the factory service manual available on this site, usually there is a section for codes and their most common troubleshooting steps or explanations. That may give you the direction in which to look. Additionally, you should be able to find the components exploding view in the transmission section.

Thanks Ilya. I will look into the factory service manual.

A quick look on the interweb shows that a bad transmission speed sensor will effect how a transmission operates. I would get the front end up off the ground and start looking for those sensors. Rock Auto has a variety of them for small $. I wish I could find info on where they are located. It appears there are two of them and by the looks of the sensor they bolt on to the side of the transmission somewhere.

Great. thank you. I will look at RockAuto

Any updates on your tranny quest?

My JX has 140k, and i've heard too many stories about a failed tranny between 150 and 200k. I feel like I'm playing Russian roulette, however it runs great, smooth and has no issues.

Once the tranny goes a new/used tranny is nearly the same cost as the full-working vehicle trade in value.

HI Yeller:

So, as of right now, my too codes were sensor related - vehicle speed sensor to be exact. I just ordered the part to for the VSS, hopefully once installed my car will be back on the road without having to replace the tranny.

I will keep you posted.

Any luck with the speed sensors?