SRNicholson

Dealer says it's OK to drive as long as the MIL isn't flashing, here's hoping that I can use it until I can book it in for them to run the scan on it.

I found one person who had the same code on a Reddit page with a 21 also and it was a legit problem with a valve assembly. Looks like a very rare issue. In his case the part needed took months to locate. I hope it isn't the same now. Calling the dealer shortly to figure out what it might be.

For the last couple of days the truck started saying it's operating with reduced power - my Mrs. didn't bother telling me this until I got into it this morning. When I started it the cooling fans were running full speed even though it was close to freezing and it had sat overnight. MIL went out after about 6 starts and it was fine for most of the day then came back. I plugged in a code reader and am seeing P1010 which is "P1010: Engine Coolant Flow Control Valve Position Sensor Exceeded Minimum Learning Limit". There is a bulletin out for a possible software anomaly with 2020 models otherwise I can't find much out about this. Any ideas as to what this might be? I may have to resort to talking to the dealer about this tomorrow morning. It's my only vehicle so need it for work so I hope it's not a biggie.

18,000 km now on Denali, no shift issues at all. Still smooth like a Molson Golden.

I am also a former "tech guy" so was anxious to get the update as soon as I saw an email about it. PM me if you want a copy of it. Had first oil change on my 2021 Denali last week. I got them to update mine to v155. They didn't want to update it and only after I let them know that I have misc Android Auto issues would they do it. As a general practice apparently my dealer won't do it if nothing is broken. They likely don't want to bother in your case I'm sorry to say. For the record, I still have flaky Android Auto issues. It doesn't seem to have corrected the random ignoring of requests and responses that I encounter on a regular basis.

We have a Toyota RAV4 hybrid that sounds like a pinball machine when you open the driver's door. Whirring and clunking goes on for more than 30 seconds. The GM sound is minor in comparison.

I had v155 installed today. I have an Android so hoping it cures some of the bugginess in Android Auto as well. I found it would often not respond to voice commands even though it acknowledged them on the screen. Haven't driven for more than 10 minutes since then so no significant observations yet. My dealer was hesitant to install it and I had to let them know it had issues. They apparently won't do it as a general likely just to not have to deal with the time it takes. I'm perhaps not their typical customer who has no clue about software and I perhaps am too anxious to get updates when they are available.

Forgot to include that info - about +5C at the time.

I had an interesting drive towing a trailer yesterday for the first time. I put a full jug of DEF in the tank 2 days ago and it read 3/4 full. After 450 km of driving my dash suddenly displayed the message below. I left it on the screen until the end of the trip and the remaining km went down very rapidly. I drove another 75 km and the remaining count went down 325 km. I was confused as to why this popped up at all, and then surprised as to the rate at which it went down. End of the trip the DEF level only went down to 1/2 showing on the level. Best thing I did find was that the truck towed a 4500 lb trailer magnificently. 1500rpm most of the time and 2100rpm on hills. Shifts were still smooth as ever even going uphill. Fuel consumption was 16L/100 km (15 mpg) which is far better than I ever saw with my 5.3L 2012 when towing. Any idea why the message popped up at a random time like that? I'm guessing the computer determined that the DEF usage rate was excessive and it displayed this as a warning.

I wouldn't bother doing that, it's going to make zero difference. Snow will stick to Teflon in the right conditions. Here's a picture of a parking lot from this morning with big chunks of dirty snow that accumulated and fell off of random vehicles. I guarantee that some of them had no mud flaps / guards and it still clung to their wheel wells. Apparently the terms "car boogers" and "fenderbergs" are names that people have given these.

Based on EXTENSIVE (lifetime) experience with snow / ice, there is not a single vehicle of any make / model that doesn't have buildup like this. My 2012 Sierra had it, our Toyota RAV4 has it, and every Tesla I saw was exactly the same thing. In Canada it's called Winter and under the right conditions there's not a darn thing you can do about it. Temps down to -34 here last week and my wheel wells were plugged with solid packed snow every day and so was everyone's. The parking lots get littered with big chunks that people kick off when they are stopped and I'm sure I saw some that weighed 15 pounds off of bigger trucks. They even hang below the mudflaps and build up behind that on the running boards. My 2012 would sometimes have so much buildup (no mud flaps) that opening the door was a problem with a dirty snow cone reaching the lower corner of the door. I don't think we can blame GM for any of this is my point. Blame Al Gore for being wrong about snow not existing after 2010.

On a somewhat coldly related note, I could not get my tailgate release button to work today. I guess it didn't like the -30 weather any more than my hands and feet did. The remote and cab release worked thank goodness but it was a bit annoying for it to not cooperate. I hope it perks up with less cold temps coming this weekend.

On another thread one user stated that 2020 forward do not have the thermostat in the cable so it doesn't disable current flow at warm temps. This was referring to the Duramax, not sure if the same for gas engines.

Temp was -30 this morning, truck fired right up after bring plugged in 4 hours. Warmed up faster than my previous truck 2012 5.3L and once it was warm I had to turn off the seat heater to keep from sweating. Tires were down about 5psi due to cold. We don't get too many super cold days like this but good to know the diesel will handle it just fine.

We now have a -30 forecast, going to have to break out the block heater cord and some long johns it looks like. I hoped we'd have some global warming and skip this crap this year.