For the last few months I have been having a random Diff lock and VDC off light flicker. It was very random and would only happen here and there. One of the lights would flicker once or maybe twice and then I wouldn't see them for weeks. Last week they started to flicker regularly and then they came on along with the slip light and the ABS light. No codes found by my blue tooth code reader so, I had a friend clean the battery terminals and checked the wiring and connectors to the wheel sensors and on the rear diff as I still had my arm wrapped up from arm surgery. Lights stayed off for about 3-4 days but then came back on though randomly. Since I was due for an LOF and rotation, I decided to bring it in to the dealer.
As a side note, I had the LR axle replaced by the dealer under the Nissan powertrain warranty due to a leaky seal about 10K miles ago.
I get a call back from the dealer, multiple codes found and metal debris in the differential fluid. Thinking back, I did have an issue getting the locker to engage over the winter, but thought nothing of it. He told me Nissan replaces the entire assembly and does not go in and simply replace parts. He had already called my extended warranty company and they had already authorized the repair plus would pay for 2 days in a rental car. The part was in Chicago and they were going to have it overnighted but my truck would be ready the next day.
SO, I got to ride around in a beige on beige Altima. Nice car, but, not even close to what I would ever drive. Polar opposite of my truck.
The dealer called me the next day and said my rear pads were about half worn, but my rotors had some pitting so they would prefer to put new on the new axle. I figured I was getting the axle covered and it made no sense to put old brakes on a new axle. and I had replaced the front pads and rotors a few weeks ago. So, new rear differential assembly, pads, rotors, LOF, tire rotation a wash and vacuumed interior, tax included was about $500. I'd like to think I made out just fine.
Turns out, there was some noise coming from the rear end as once I picked my truck up and got on the highway, I realized how much more road noise I was hearing instead of driveline noise.