Jac365

Me too!! I had to do all 4 rotors/pads at 21,500 miles! First time I ever had to replace brakes BEFORE tires!!

Get a Range DFM disabler or the Pulsar and you won't need to use L-9. I had one in my 2012 (AFM) Sierra and it worked well. When I got my 2019 AT4 (DFM) I contacted Range and was told my existing disabler would not work on DFM, but if I sent it in they would reprogram it for DFM at no charge! I did send it in and have had it on my truck since. An added bonus is it also disables the auto start / stop about 90% of the time. (it's not designed for the auto start / stop but hey, I'll take it.)

I put a Borla S type cat back on my truck and love it.

Ya, I posted a similar thread. 2019 AT4 brakes wiped out at 21,500 miles. Rears worse than fronts (slightly). I did contact GM, was told sorry, it's on your dime but MAYBE we'll float you some GM rewards points after you have them replaced. I took that as an insult. I went with ceramic pads and coated rotors, We'll see how long these last..... Edit to add: started out getting "new pads detected, reset monitor?" and then shifted to "service brake pad monitor"

I got this recently too. Rear pads were down to 2mm, front at 3mm, in other words I needed new brakes at all around. I rarely tow or haul anything and needed new brakes at 21,500 miles.

I highly doubt it's the card. My nav worked too until I would get "SD card removed". It was a very common problem. New Nav cards need to be encoded to the vehicle V.I.N.. and will only work in that particular vehicle.

I used to get that issue a lot. If I remember correctly what finally cured the issue was the replacement of 3 items tied to the nav., all in the console. The card reader was one of those items. I will see if I can find the paperwork from when it was done. It should list the items that were replaced, although I am sure it was not just the reader. Since mine was done about 18 months ago the nav has been excellent. Edit to add: I doubt the card itself is bad, outdated maps? sure. Bad? Doubtful.

2019 AT4 5.3 with most options I.E. pedestrian braking, lane change etc. Started getting "new pads detected, re set monitor?" That then changed to "check brake sensor monitor" . Took truck to dealer that has performed all services. A check of the brakes reveals all inboard pads are wiped out. The fronts have approx 3mm of material left, while the rears are worse with approx 2 mm of material. The outboard pads are decent, what would be expected with a truck that has 21, 500 miles on it!!!! Yes, it needs brakes on all four corners at 21, 500 miles. I did contact GM in regards to this. While I do understand I am well over on the 3 years of the new warranty having to replace the brakes with such low milage is NOT NORMAL. This is a truck used as a commuter vehicle, not towing, plowing, hauling anything. G.M., bless their hearts, was very polite and understanding as they told me they understood my aggravation and agreed the vehicle should not need brakes at such milage BUT since brakes is a wear item and the age of the vehicle they could be of NO assistance with the necessary repairs. They did comment that after I pay out of pocket for the repairs they may entertain an offer of some GM bonus points. Maybe I'm wrong, but the bonus points thing to me felt like an insult. Has anyone else encountered abnormal brake wear? If so, what was the cause, and was a fix found? I have had four Sierra's, 1995 step side RC, 2004 Pro Sport ext cab, 2012 SLT ext cab and now the AT4. None of the others ever had an issue like this. (2004 rear disc brakes sucked) but even they lasted way longer. When driving the truck everything appears normal, but needing to replace the brakes at 21500 miles is definitely not normal.

My 19 AT 4 had same issue. Was told by dealer in order to correct issue 3 separate items needed to be replaced. I believe this items are: Card reader, new SD card and a "receptacle" (wasn't provided more info at the time what, in particular, the receptacle is) Was also told the issue can be caused by any of the three different items so they just change all three at once and call it a day. Nav has been issue free since.

Flowable sealer and a bendy straw. Straw can be formed to fit between glass and spoiler to apply sealer. Worked for me.

Range inc. offers two methods for disabling DFM. One is the Range box. (plugs in to OBD port). I have this my truck. Bought it to disable AFM on my 2012 Sierra 5.3. When I got the 2019 AT4 I sent the box to Range and they updated it for DFM and sent it back, free of charge. Works well, even disables the auto stop crap 90% of the time, even though it's not designed for that purpose. The other is a Range Pulsar. More costly but more features. The pulsar piggy backs the electronics and allows the user to disable DFM and auto stop, recalibrate top speed, recalibrate for tire size, recalibrate tire pressure max and mins and recalibrate throttle sensitivity. If the Pulsar is removed everything goes back to factory settings. (NOTE: I am not affiliated with Range INC an any shape or form, just a customer.

Was this the second failure on the same vehicle?? If so I don't get a warm and fuzzy feeling about the replacement hoses. Mine blew (catastrophically) at 6K miles. Thankfully I was able to get engine shut down within 5-6 seconds of line blowing, but still dumped 5 of the 8 quarts of oil in that time. New line has been good.....so far

Accidental double post

Just ask dealer to perform 21-NA-228 (Idle timeout disable) should cost about $60 for the change. Once completed motor will run until you shut it off, like a normal vehicle.

I have the Du Ha posted by Chrisr2021 above. Very sturdy. Wish it had a lockable top but other than that I'm very happy with the amount it will hold.