Engine Exhaust System problems of the 2011 Chevrolet Silverado 3500

Diesel exhaust filter (def) and flow reduction tube on duramax lml engine. Fautly def requires extremely high temperatures to clean - or regenerate - causing the def and reduction tube to fail. High temperatures are a fire hazard to vehicle and grass or other terrain over which the truck is parked. Gm no longer manufactures the reduction tube, gm part number 25960609 forcing the consumer to wait for gm to make part on special order basis - over 30 days - or force consumer to remove def or make other fabrication, order to operate the vehicle. Gm is aware via customer service and dealer complaints that the lack of part 25960609 availability is a nation-wide problem and has a high failure rate. Gm stopped production as a cost saving measure. The duramax lml engine is in service mostly as commercial vehicle fleet. Thus, there is a high probability of unsafe fabrication in order to restore vehicle operation.

Tl-the contact owns 2011 Chevrolet Silverado 3500. The contact stated that while driving at 55 mph, the vehicle failed to accelerate pass 50 mph and the exhaust fluid quality poor warning indicator illuminated continuously. The failure recurred on a daily basis. The vehicle was taken to a dealer. The technician diagnosed that the diesel exhaust fluid tank was faulty. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was unavailable. Pam.

Exhaust fluid quality poor appeared on the dash display, so I toped it off with more fresh def and the warning went away. 3 days later the same warning came back on the dash display only with a new warning with it that said vehicle speed will be limited to 55mph next fuel fill, it did! I took the truck to the dealer they found bad nox sensors 1&2. Repairs where not done because I felt that should be some sort of recall on defective parts that controls the drivability of a vehicle. On Feb-4-2015 I received a letter from gm after 2 years telling me that my truck may have nox sensors that can become contaminated and that gm is extending the warranty on the nox sensors and the wire connectors for 10/yrs. 120. 000 miles which ever comes first. So I go back to the dealer and show them the letter from gm and show them my receipt from when I came in 2 years ago that shows that the nox sensors were defective way back in 2013 and are still on the vehicle and I need the repairs done per the letter from gm. The dealer is refusing to repair the vehicle because of the mileage that is now on the vehicle, however the defective parts that failed when the vehicle was within the mileage are still on the vehicle and I feel should be replaced and repaired or reimbursement for $800. 00 programmer. I have contacted Chevrolet and they are working with that dealership to try and resolve this issue. Case number is available if needed, gm letter number is 13386.

Strong exhaust and or raw fuel smells inside cab and around outside of vehicle engine bay. Especially noticeable when vehicle is regenerating. Smoke billowing out from under right side of hood. A clear liquid and a black liquid running down exhaust pipe from turbocharger exhaust exit. Noticeable leakage on floor under vehicle. This is a fire hazard that is not being diagnosed, repaired or tested correctly. This vehicle has been to gm dealers three times to address these problems.