Jump to content

Winter is coming another engineering wonder

3.0

By 3.0
in Troubleshooting, Warranty & Recalls

 Share

Recommended Posts

3.0 Enthusiast

3.0

Posted
Posted

Got a 2020 3.0 D for the most part  love the truck but not a lot of confidence in the engineers who take the bus and/or train to work. This is a heads up for the coming winter on your block heater.The engineers have put a thermostatic head in the male head of their GM specific block heater cord ( the cord is a rip off / 100 bucks if you have to replace it) so if you need to use another extension cord to plug in do not leave the plug head of the gm cord laying on the ground. If the air temp is warmer than -18c the ground may be colder opening the block heater circuit which the motor will see as a heat issue/fault code  when you start the motor it will turn on the high fan for 6 hours of run time.The only way to resolve the issue is let the engine run in fan high for 6 hrs or remove the fault code. Gm doesn't think this is a serious issue and has shown no interest in resolving either the cord or heat sync issue so even though it's a pain if you come across this issue call roadside assistance and have them tow the vehicle to the nearest stealer and if it hits their pocket book often enough they will resolve the issue (put the thermostat in the standard male receptacle in the bumper) . Thought for the day ... think of how much more money GM would make if they did it right the first time?

  • Like 1
SVG Enthusiast

SVG

Posted
Posted

I thought I remember reading that there was a software update to address the 'Full Fan Syndrome'?

 

Either way your point is spot on.

1454 Enthusiast

1454

Posted
Posted
On 9/17/2021 at 7:47 PM, 3.0 said:

Got a 2020 3.0 D for the most part  love the truck but not a lot of confidence in the engineers who take the bus and/or train to work. This is a heads up for the coming winter on your block heater.The engineers have put a thermostatic head in the male head of their GM specific block heater cord ( the cord is a rip off / 100 bucks if you have to replace it) so if you need to use another extension cord to plug in do not leave the plug head of the gm cord laying on the ground. If the air temp is warmer than -18c the ground may be colder opening the block heater circuit which the motor will see as a heat issue/fault code  when you start the motor it will turn on the high fan for 6 hours of run time.The only way to resolve the issue is let the engine run in fan high for 6 hrs or remove the fault code. Gm doesn't think this is a serious issue and has shown no interest in resolving either the cord or heat sync issue so even though it's a pain if you come across this issue call roadside assistance and have them tow the vehicle to the nearest stealer and if it hits their pocket book often enough they will resolve the issue (put the thermostat in the standard male receptacle in the bumper) . Thought for the day ... think of how much more money GM would make if they did it right the first time?

GM do things right the first time. That's comical. I've seen enough with my truck to know that is not something they are competent enough to pull off. 

redwngr Senior Enthusiast

redwngr

Posted
Posted

No need to be plugging it in at -18C  (0F) anyway.

And yes, in late 2019 there was there was updated programming released to deal with the fan running thing. 

 

https://gm-techlink.com/?p=12389

Cooling Fans Running for an Extended Period

December 13, 2019

Some 2020 Silverado 1500 and Sierra 1500 models equipped with the 3.0L diesel engine (RPO LM2) (Fig. 12) may have the engine cooling fans running continuously for an extended period of time. The Check Engine MIL also may be illuminated.

 

F12-30-duramax-diesel.jpgFig. 12

 

Currently, an engine calibration in the Engine Control Module (ECM) will falsely set DTC P0111 (Intake Air Temperature (IAT) Sensor 1 Performance), which occurs when the engine block heater is used in ambient temperatures above 0°F/–18°C. As a result, the cooling system will go into remedial action and turn on the cooling fans at 100%. The remedial action will continue until the engine goes through a six hour cold soak.

If this condition is found, clear the DTC and return the vehicle to the customer. Do not perform any further diagnosis or replace any related components. An updated calibration will be available shortly.

Also inform the customer to avoid engine block heater use in temperatures above 0°F/–18°C. While the owner’s manual states an engine block heater should be used in temperatures less than 0°F/–18°C, it isn’t vital until much lower temperatures of less than –13°F/–25°C.

 

 

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • Chuck FB
      Joke Thread

      By Chuck FB · Posted

      Fred was in the fertilized egg business. He had several hundred young pullets, and ten roosters to fertilize the eggs He kept records, and any rooster not performing went into the soup pot and was replaced. This took a lot of time, so he bought some tiny bells and attached them to his roosters. Each bell had a different tone, so he could tell from a distance, which rooster was performing. Now, he could sit on the porch and fill out an efficiency report by just listening to the bells. Fred's favourite rooster, old Butch, was a very fine specimen, but this morning he noticed old Butch's bell hadn't rung at all! When he went to investigate, he saw the other roosters were busy chasing pullets, bells-a-ringing, but the pullets, hearing the roosters coming, would run for cover. To Fred's amazement, old Butch had his bell in his beak, so it couldn't ring. He'd sneak up on a pullet, do his job and walk on to the next one. Fred was so proud of old Butch, he entered him in the City Show and he became an overnight sensation among the judges. The result was the judges not only awarded old Butch the "No Bell Piece Prize," but they also awarded him the "Pulletsurprise" as well. Clearly old Butch was a politician in the making. Who else but a politician could figure out how to win two of the most coveted awards on our planet by being the best at sneaking up on the unsuspecting populace and screwing them when they weren't paying attention. Vote carefully in the next election, you can't always hear the bells.
    • chfkief
      FS: Black Bear Performance AutoCal Tuning System

      By chfkief · Posted

      Do you still have?
    • 3CarSeatDad
      High Country Suburban build confirmation

      By 3CarSeatDad · Posted

      Can someone confirm if the GM order workbench terminal is able to validate a custom build sequence:   1) Initialize the Allocation Base: Open a new vehicle build queue, select the 2026 Chevrolet Suburban 4WD, and pick the High Country (3LZ Preferred Equipment Group).   2) Select the Diesel Powertrain: Go directly to the engine configuration screen and choose RPO code LZ0 (3.0L Duramax Turbo-Diesel). Ensure it maps to the MHS 10-speed automatic transmission.   3) Deploy the Seating Swap: Navigate to the Interior Options screen and enter RPO code ATT to replace the standard captain's chairs with the power-release 60/40 bench seat. Because you are not trying to force a separate luxury or air-suspension bundle, the standard, premium D07 Fixed Floor Console remains active. The system will accept this change immediately without triggering a warning message.   3)Apply Heavy-Duty Hauling Capability: Input RPO code NHT (Max Trailering Package). The commercial terminal will automatically bundle the required trailering hardware and software modules to support the diesel engine's maximum towing capacity.   5) Layer the Premium Tech and Glass: Separately add code C3U (Panoramic Power Sunroof) and code UKL (Super Cruise) to the order screen.   6) Run the Final Validation: Click the "Validate Order" button at the bottom of the interface.
    • revmanii
      Looking at ordering a '26 WT because I want a std cab, std bed

      By revmanii · Posted

      Spent the last hour or 2 googling and reading up on the spacer thing. I don't like the loss of thread contact on the slip on spacers, but it appears you can get "extended" lug nuts that reach into the hole of the wheel to get back the lost threads. Looks like the only true hubcentric slip on spacers are at least .375". I'd want as little as I could get away with and don't want to cause other clearance issues going any thicker. Bora seems to offer what appears to be a well made .375" spacer and extended lug nuts. I searched here and did find a couple threads recommending Bora. But not cheap. By the time I buy spacers and lugs, new TPMS sensors, then pay a tire shop to install the new sensors, I suspect I'm going to be in over $400. Thinking about running out and getting some washers to put behind the wheel to see if .375" is enough to clear calipers, turn lock to lock without rubbing, and to see if the wheels/tires look strange pushed out a little. This would just be to check fitment.
    • Core-Lokt
      Road Master Active Suspension

      By Core-Lokt · Posted

      Roadmaster makes some quality parts; I have their sway bar. I considered the RAS, but I ended up bagging. I didn't know what kind of ride I'd get with RAS, and the bags have interior jounce bumpers, so I can run 0 pounds pressure. I figured I'd have the best of normal suspension ride with assist on-demand. But it seems you got pretty much the same in one item.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...