Problem: Unable to shift transmission from D to another position like R, P, N due to snow/slush being on shifter. I travel on Idaho state highways and County roads that are plowed. In February, I traveled state highway 14. Road conditions were plowed snow roads, broken snow floor, slush and pavement without slush or snow. I had a passenger with me on this trip from Elk City, Idaho to Grangeville, Idaho via SH-14. When I pulled into my storage unit, I could not shift from D to P or N or R. I could only drive forward. The temperature in Grangeville was mid 40s. I did not have any tremendous snow build up on the under carriage or wheel wells. I drove to the dealer Gortsema Motors and their service technician said that I needed to go to a car wash and blow out the snow buildup next to the transmission linkage shifter. When I pulled into the car wash, I still could not shift the transmission. My passenger got out and used the water to push out the snow buildup around the linkage shifter. Then I was able to shift between all gears P, R, N, D. This is a big concern because this should not have happened. This is a major problem in the winter and had there not been a car wash to blow out the snow/slush, I would not be able to turn the truck off or restart the diesel truck in gear. There needs to be a protective shield around the shifter so that snow/slush does not get up into area and cause the shifter to not shift.

- Garden City, ID, USA

The throttle body gets stuck wide open after the eninge gets up to operating temperature, it will give some warning with the throttle like on off throttle use and no codes show up at all. The risk of everyones is in extrem DANGER. The break are to soft and well not stop unless you put both feet on the break pedal down to the floor. Tranismission can NOT figure out what gear it needs to be in way too many gears and horrible fuel mpg for the 6.6L Duramax L5P. None of the GM dealership will look at the truck unless there is a code or it is happening right there when they look up the trucks VIN.

- Rocklin, CA, USA

-??The diesel exhaust fluid heater is a faulty component in the system, there is a back order on the part with no ETA -?? My pickup only does 55MPH right now and soon to do 5MPH you cannot drive on a public road doing 5MPH -??There is thousands of other people having the same exact problem! -??The DEF light is illuminated on my dash along with the check engine light, when you diagnose the error code it comes up with -??P20C1 Reductant Heater C Control Circuit/OPEN-??

- Weldona, CO, USA