Part Number: 85138746 - DEF tank assembly, heater, pump, reservoir. I was told there were issues with the heater and pump. The heater turns high or the heater won-??t work; and there are issues with the connector.02/24/22: My truck has 16,000 approx. miles. The check engine light came on and displayed message that I had so many miles until truck would be restricted to 65MPH. I took my truck into Kendall dealership in Nampa, Idaho and was told there was myself and another person who had the same issue. A couple weeks go by and I call the dealership back and was told that I was 5th in line and there were 20 behind me. I was told that there were 11,000 parts already spoken for and 6,000 parts on backorder. I was one of the backorder individuals. I was also told that they do not have a ETA on when they would receive parts and that parts show up unexpected. They told me that I would have to contact GM customer service for assistance. The dealer called me back March 31st to see if I got my camper moved and how much it cost to move. They told me the dealership would cover one month truck payment and would like me to send in my loan payment statement. I asked for clarification as I didn-??t know how I could have been 2nd person and the other day he said I was fifth in line. He said that there are at least 2-3 persons for service technician at dealership. Only 2 got fixed in the last 2 months. I asked if the new part going in will have the same issue or will be a re-designed part that fixes the issue. Dealer said the same part. GM is working on a re-design part and not ready for manufacturing. I asked why this wasn-??t on a recall and he said no because it would bring people in that don-??t need it replaced because their part is still working, and that GM doesn-??t have a re-designed part to fix the issue. Gortsema Motors in Grangeville, Idaho a friend brought in their 2018 Chevydiesel truck (with 87,000 miles) for the same issue. Dealer said they have many cases.

- Garden City, ID, 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