NOX Sensors

GM extended the warranty on the NOx sensors to 10years. 2011 model years were notorious for NOx sensors going bad giving "POOR DEF quality" message in DIC.

http://www.duramaxforum.com/forum/2011-lml-duramax-powertrain/573897-10-year-nox-sensor-warranty.html

Good on GM for stepping up.

Get down there and get that money!!

So, after getting excited and heading down to the dealer I found out they wont reimburse me for the NOx sensors, I guess there is a 120K limit to the warranty and I was at 125K... bummer.

Bummer indeed. Sorry to hear that. At the same time, and for what it is worth, I've been hearing that a lot of manufacturers have been having trouble with NOx sensors, it's not just a GM problem.

I just called GM and they told me to go to the dealership for reimbursement.

Thanks BELTZY for posting this.

Paul

Beltzy wrote:
So, after getting excited and heading down to the dealer I found out they wont reimburse me for the NOx sensors, I guess there is a 120K limit to the warranty and I was at 125K... bummer.

Call GM customer service, I am sure they will goodwill that for you. Doesn't hurt to ask....

When vehicles with catalytic converters first appeared the oxygen sensors had a short life and were expensive to replace. But I have not had to replace on in a vehicle in the past 20 years so I assume they got better. I expect the same with the NOx sensors. I had one go out in my 2011 Duramax before it go to 10,000 miles.

It took trips to 3 different dealers to get it correctly diagnosed and repaired. My symptoms were erratic error messages as to mile left before needing to add DEF, i.e. going into limp mode, and greatly increased DEF consumption. The computer was not getting the right reading from the NOx sensor and so it would cause more and more DEF to be injected into the exhaust stream.

When the sensor was replaced the mechanic also re-routed the wiring. The factory had put the wiring so that a section lay on the EGR body which gets very hot, and another section was resting on the AC compressor.

I'm glad GM has this finally figured out! My '11 has had the "poor DEF" message 3 times now. They replaced one of the NOX sensors last time. I asked if they replace both and was told "no, only one was bad". It is only a matter of time and I'll be back in for the other.

Beltzy, call GM customer service and have them look up the records for the service. They always write down your mileage so there will be proof that you were under the 125000 mile limit.