LSPowered65 replied to JRSPerf.'s topic in 6.6L Duramax Diesel & Allison Powertrain (L5P/MGM)The day I drove mine off the lot it threw a code for a sensor in the exhaust, it was replaced 2 days later. This was late February. It has always driven the same way in regards to its downshifting for speed control. It will do it in normal mode if i am repeatedly on the brakes. Happens much quicker in tow haul.
LSPowered65 replied to JRSPerf.'s topic in 6.6L Duramax Diesel & Allison Powertrain (L5P/MGM)Mine was built 12/19. It doesn’t do that. My grade braking doesn’t come on in normal driving unless I’m really on the brakes. In tow haul it activates much quicker. Maybe you aren’t getting a response because others aren’t having the same issues as you.
Out of stock and price went up. https://www.ebay.com/itm/193137250862
Just the tip..... Less than $40 on eBay. They have polished on there also.
Mine went in today for complimentary oil change and tire rotation. I have a little over 6k miles. I let them know about the noisy brakes and tech bulletin. Service adviser asked me if they do it hot or cold, I said mainly hot. Mine get substantial worse after unhooking from my 24’ enclosed trailer. I will let you guys know what they do later today.
Make sure it’s fully closed, I have a GMC multipro and if it’s not fully latched it won’t open, won’t even try to open. I have to push it in and make sure it’s latched fully, then it works fine.
Looks like the end date for Bulletin #20-NA-020 is September 1st of 2019 production. Mine was built in December of 2019 and the brakes squeal, sounds like only the fronts, 5,700ish miles and has been doing it for the last 5-700 miles.
I run generic 433mhz sensors in mine, never had a issue. Less than $30 for all 4 on eBay. Maybe some states use a different metal for their license plates. Do you have a metal trim ring on yours? Try taking it off if so. Does your state offer/make plastic plates? I also have a TPMS relearn tool, makes GM tire rotations a breeze and is helpful with the trailer tpms now that I have them. EL-50448 tpms relearn tool, was $8.50 on ebay.
I have had similar issues. Make sure your iPhone isn’t plugged into a usb for short key cycles. That seemed to be my issue. I make sure my phone is unplugged on short key cycles and my audio always works again on restart. The truck does a full power cycyle after 5-10 mins between keycycles and driver door open and close. Try that if it does it again for shorter remedy.
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