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2020 3.0 Diesel Engine fan Racing (Diesel particulate filter?)

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Klientook Enthusiast

Klientook

Posted
Posted
On 2/9/2021 at 2:10 PM, GMC Ryan said:

Interesting. Seems rather short-sighted to eliminate the thermostat when GM knows there will be problems plugging in above 0F/-18C. I wonder if you could just get a block heater cord with the thermostat and let that take the guess work out?

I have looked for one the problem is they are on the block heater side which is directly wired to a plug end behind the lower bumper now not easy to fix. Would be nice if I could buy the corded end that I would plug in.

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Brandonb0013
Brandonb0013

Dropped it off at the dealership this evening.  They said there was no service bulletin for this issue and they were not aware of it.  I printed off this article and left it with them since it explain

Brandonb0013
Brandonb0013

Received the truck with a new water pump installed. I'll test out the cold start with block heater in the morning.  Keep you updated as well.

Brandonb0013
Brandonb0013

I agree, I hope this is all that is needed until they can fix the remote start part.  I hope to hear your experiences if you give the block heater a shot! 

Brandonb0013 Enthusiast

Brandonb0013

Posted
Posted
4 minutes ago, Klientook said:

Pretty unbelievable that no dealer can figure out the answer to this. I even took the Bulletin like you did in. 

Yeah, the thing is, thats not a GM Technical Service Bulletin, and, well, my service tech said there wasn't a TSB for the issue.  That is just an article that explains our problems I guess.  I'm sure it's still helpful though.  

Brandonb0013 Enthusiast

Brandonb0013

Posted
Posted

Dealer called, they are in contact with GM.  They asked if 1) it was parked outside last night: yes, 2) temperature when it was started: -4F.  

They stated the the issue is not that it was plugged in above zero, but that it was unplugged above zero.  To which I asked, if I had it plugged in overnight, unplugged it at -1F, and started it 20 minutes later when the outside temp is say 0F or 1F, assuming the engine coolant temperature were still warm, would it still cause the issue?  

 

Regardless, my service rep is doing a great job, but he is going to contact GM again with my answers as well as see if there is some workaround.  The fact he did not explicitly say there is a fix and we are going to try that is not the most promising though.  The truck starts slow enough at 0 degrees F, and I would sure like to be able to reduce wear and tear on my engine by being able to plug it in at any temps below freezing honestly.  It's ridiculous this is even a thing.  There are things that technology is useful for, and this is not one.  

Klientook Enthusiast

Klientook

Posted
Posted
3 minutes ago, Brandonb0013 said:

Dealer called, they are in contact with GM.  They asked if 1) it was parked outside last night: yes, 2) temperature when it was started: -4F.  

They stated the the issue is not that it was plugged in above zero, but that it was unplugged above zero.  To which I asked, if I had it plugged in overnight, unplugged it at -1F, and started it 20 minutes later when the outside temp is say 0F or 1F, assuming the engine coolant temperature were still warm, would it still cause the issue?  

 

Regardless, my service rep is doing a great job, but he is going to contact GM again with my answers as well as see if there is some workaround.  The fact he did not explicitly say there is a fix and we are going to try that is not the most promising though.  The truck starts slow enough at 0 degrees F, and I would sure like to be able to reduce wear and tear on my engine by being able to plug it in at any temps below freezing honestly.  It's ridiculous this is even a thing.  There are things that technology is useful for, and this is not one.  

Completely ridiculous answer lol.

 

Brandonb0013 Enthusiast

Brandonb0013

Posted
Posted

Doing some digging with my weather station data (smarthome), I found the following:

 

From my smart plug that triggered the block heater, I "plugged it in" at 8:33AM

 

Real weather data pulled from weather station sensor on my roof at 8:30am says +2.0 degrees F, while my smart mirror (openweathermap data) said -5.28 at 8:24AM (so I fed them wrong information here).

 

Again, my weather station said that at 9:30AM, the temp outside was +2.4 degrees F, but openweathermap says -1.86 at 9:34 (again I told them it was negative temps when I started it because I was looking at openweathermap data, not the sensor outside my window, but in reality it was above 0F).

 

I looked back at the video I took at 9:32AM of me starting the truck to confirm the actual start time today.

 

I called the dealer back and notified of the actual temperatures, not the openweathermap temps as this is vital to the troubleshooting process I'm sure.  

Brandonb0013 Enthusiast

Brandonb0013

Posted
Posted

Dealer just called, they needed verification of info to give to GM.  They asked if 1) was the vehicle remote started or push button started: remote started and 2) was it still plugged in when started: yes

 

This morning they tested (at the dealer) at above 0F temps.  They tested by leaving the vehicle plugged in, but used the push button start and did not have the fan issue.

 

Maybe this is a workaround?  Anyone else willing to try this on their vehicle? (Above 0F, powered block heater, push button start).

gemarsh Senior Enthusiast

gemarsh

Posted
Posted
2 hours ago, Brandonb0013 said:

Dealer just called, they needed verification of info to give to GM.  They asked if 1) was the vehicle remote started or push button started: remote started and 2) was it still plugged in when started: yes

 

This morning they tested (at the dealer) at above 0F temps.  They tested by leaving the vehicle plugged in, but used the push button start and did not have the fan issue.

 

Maybe this is a workaround?  Anyone else willing to try this on their vehicle? (Above 0F, powered block heater, push button start).

I'm old school. ALWAYS unplug block heaters before starting engines.

Brandonb0013 Enthusiast

Brandonb0013

Posted
Posted

Dealer called again.  They want me to take the truck back over the weekend and do more testing as the temps are going to be cold enough to test again (though only Sunday when the dealer is closed, and Monday morning).  

 

I was told to use the block heater, but only start it with the push button, not remote start.  GM thinks there is a programming issue if the remote start is causing the issue. I'll report back as I test throughout the weekend.  I'd love to hear what other people experience as well.  

Brandonb0013 Enthusiast

Brandonb0013

Posted
Posted
2 minutes ago, gemarsh said:

I'm old school. ALWAYS unplug block heaters before starting engines.

Do you have a reason behind this?  Or is it just so you don't drive away with it plugged in?

gemarsh Senior Enthusiast

gemarsh

Posted
Posted

I leave my '21 3.0 plugged in all the time. I unplug it, hang the cord on the wall, get in and start it. No CES or fan sound.

 

I can't say if remote start even works on it, as the remote has not left the cab since purchase.

gemarsh Senior Enthusiast

gemarsh

Posted
Posted
3 minutes ago, Brandonb0013 said:

Do you have a reason behind this?  Or is it just so you don't drive away with it plugged in?

I was taught that if you leave the heater plugged in, it would have the same effect as cold water hitting a light bulb. Every tractor, semi, combine has been treated this way, and I have never had a heater element not work. 

Brandonb0013 Enthusiast

Brandonb0013

Posted
Posted
8 minutes ago, gemarsh said:

I leave my '21 3.0 plugged in all the time. I unplug it, hang the cord on the wall, get in and start it. No CES or fan sound.

 

I can't say if remote start even works on it, as the remote has not left the cab since purchase.

I appreciate your input.  So you are experiencing what the dealer is, that if it's not being remote started, you have no issues.  To clarify, do you plug it in above 0 degrees F?

Mercracing Enthusiast

Mercracing

Posted
Posted

If this is all that’s needed, that’ll be exciting. I haven’t been plugging mine in just so I can avoid this issue.


Sent from my iPhone using Tapatalk

Brandonb0013 Enthusiast

Brandonb0013

Posted
Posted
6 minutes ago, gemarsh said:

I was taught that if you leave the heater plugged in, it would have the same effect as cold water hitting a light bulb. Every tractor, semi, combine has been treated this way, and I have never had a heater element not work. 

Not sure I follow this.  If you unplug the heater and then start the vehicle, the element should still be heated, thus I wouldn't expect it to be that big of difference.  I'm not familiar with how hot the element gets, but the engine is never at 160 when I start it after using the block heater, so I have this hunch that it doesn't get crazy hot in the first place...?  Maybe?  But, I'm pretty sure that it's not getting above the boiling point of the coolant, which is then when I would expect the "water on a light bulb" scenario to happen.  

Idk, I'm just speculating and thinking aloud.  Again, thank you for your input!

Brandonb0013 Enthusiast

Brandonb0013

Posted
Posted
1 minute ago, Mercracing said:

If this is all that’s needed, that’ll be exciting. I haven’t been plugging mine in just so I can avoid this issue.


Sent from my iPhone using Tapatalk

I agree, I hope this is all that is needed until they can fix the remote start part.  I hope to hear your experiences if you give the block heater a shot! 

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