Jump to content

Def issues

Steve Greuter
 Share

Recommended Posts

CamGTP Senior Enthusiast

CamGTP

Posted
Posted

Sucks that nothing is available for parts but what can we do for you?

 

It's not your fault they can't fix, so it's on them (the dealership) to take care of you. No doubt you got a loaner, so pretty much you wait. They won't lemon law or buy back your $60,000 truck because of this.

Mercracing Enthusiast

Mercracing

Posted
Posted

I wouldn’t dream of deleting until out of warranty. I would lean on the dealer for a sweet loaner or talk them into a new truck.


Sent from my iPad using Tapatalk

07HD Enthusiast

07HD

Posted
Posted

 The dealer should give you a new truck or just pull a pump off another truck.

CamGTP Senior Enthusiast

CamGTP

Posted
Posted

A dealer won't take a $5,000-10,000 hit and give him a new vehicle, it's got 12,500km on and not 100km's. He'll be waiting until parts come in.

07HD Enthusiast

07HD

Posted
Posted
1 minute ago, 07HD said:

 The dealer should give you a new truck or just pull a pump off another truck.

PS. Don't make a bad problem worse by deleting your Def.

Cool J Enthusiast

Cool J

Posted
Posted

I would ask for the part number and call around to several major dealerships to see if by chance they have one on the shelf. I had that issue with a Ford back in the 90's in Globe AZ. I called around and found the part they needed in Phoenix. I told the dealer in Globe where it was and they sent a truck down to pick it up and my car was back working the next day.

  • 9 months later...
Mark Terheggen New Member

Mark Terheggen

Posted
Posted

2020 GMC 3500 Denali great truck but now stuck. Def issue has sidelined me out of town. I am losing $1,000 a day no parts to be found. I have a full extended warranty to 120,000 miles. I already am at 60,000 miles

 Mechanic says I might need new truck which I lose over $15,000. Is there any help from GMC

  • 2 weeks later...
In2racn Enthusiast

In2racn

Posted
Posted
On 12/6/2020 at 10:48 AM, Mark Terheggen said:

2020 GMC 3500 Denali great truck but now stuck. Def issue has sidelined me out of town. I am losing $1,000 a day no parts to be found. I have a full extended warranty to 120,000 miles. I already am at 60,000 miles

 Mechanic says I might need new truck which I lose over $15,000. Is there any help from GMC

 

Mine just went down with a P20C1 Reductant Heater C code. Second DEF issue in 20000 miles. I will see tomorrow (Monday) to see if I can get in and if parts are available.

 

I told myself I wouldn't delete my 2020 like I did my 2011. I tried to convince myself that "they must have DEF reliable by now", but here we are 10 years later, still unreliable junk. My 2011 was first year DEF, I cut them some slack.... still junk in 2020.

Colossus Senior Enthusiast

Colossus

Posted
Posted

Wow.. The 2017-2019s seem to have had a decent run but I wonder if the 2020s are reverting to the crappy emissions systems on the LML.  Delete the emissions systems and the LML is a top runner.  Sadly doing deletes now a days is impossible thanks to the EPA crack down on the tuners and manufactures of the delete kits.  I had issues with my LML as well, sold it when the warranty expired.  My 2 LMMs were trouble free.  So far with 15,000 miles on my 2018 L5P I'm doing good. 

newdude Senior Enthusiast

newdude

Posted
Posted
On 2/11/2020 at 11:07 PM, Cool J said:

I would ask for the part number and call around to several major dealerships to see if by chance they have one on the shelf. I had that issue with a Ford back in the 90's in Globe AZ. I called around and found the part they needed in Phoenix. I told the dealer in Globe where it was and they sent a truck down to pick it up and my car was back working the next day.

 

21 hours ago, In2racn said:
 

Mine just went down with a P20C1 Reductant Heater C code. Second DEF issue in 20000 miles. I will see tomorrow (Monday) to see if I can get in and if parts are available.

 

I told myself I wouldn't delete my 2020 like I did my 2011. I tried to convince myself that "they must have DEF reliable by now", but here we are 10 years later, still unreliable junk. My 2011 was first year DEF, I cut them some slack.... still junk in 2020.

 

 

There is zero.  The 34 dealers "showing" stock in the US either have one for a customer or are 'showing" but its not physically there yet due to the backorder.  Even the dealer that is showing 6 of them.  

 

The best the dealer can do is put a SPAC case and then escalate it as far up as they can with their district manager.  Then wait.  

In2racn Enthusiast

In2racn

Posted
Posted (edited)

As expected, no parts. So my 2020 truck sits while the $1100 per month payment keeps right on going. And of course, they offer me a little ******-box to drive in the meantime. I have a snowmobile trip to Maine and need a truck. I am not a happy camper.

 

Anyone know what part number is needed for the P20C1 Reductant Heater "C" Control Circuit/Open code?  2020 3500HD Denali

Edited by In2racn
newdude Senior Enthusiast

newdude

Posted
Posted
3 hours ago, In2racn said:

As expected, no parts. So my 2020 truck sits while the $1100 per month payment keeps right on going. And of course, they offer me a little ******-box to drive in the meantime. I have a snowmobile trip to Maine and need a truck. I am not a happy camper.

 

Anyone know what part number is needed for the P20C1 Reductant Heater "C" Control Circuit/Open code?  2020 3500HD Denali

 

P20C1 Reductant Heater 3 Control Circuit.  

 

Heater #3 is the second heater in the DEF tank.  Two heaters are in there, #1 and #3.  #2 is the heater in the line.

 

Currently, the tank heaters are serviced ONLY with a new tank assembly.  There is zero inventory, and it is on national backorder.   No dealers have any available.  

In2racn Enthusiast

In2racn

Posted
Posted
51 minutes ago, newdude said:

 

P20C1 Reductant Heater 3 Control Circuit.  

 

Heater #3 is the second heater in the DEF tank.  Two heaters are in there, #1 and #3.  #2 is the heater in the line.

 

Currently, the tank heaters are serviced ONLY with a new tank assembly.  There is zero inventory, and it is on national backorder.   No dealers have any available.  

Thank you for the info. I think I saw somewhere you work for GM? 

How long has this back order been going on?   Do you know the part number?  84996345?  

Is there any light at the end of a tunnel? Is the tunnel short or very long...  scary deal.  

Colossus Senior Enthusiast

Colossus

Posted
Posted

medium.  2-3 months maybe... Yup, unacceptable, but uncontrollable. These heaters and DEF systems have been problematic with the Cummins and Power Strokes as well, so don't feel too bad :(

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

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.6k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    343,007
    Total Members
    8,960
    Most Online
    Brendan C
    Newest Member
    Brendan C
    Joined

  • Who's Online   5 Members, 0 Anonymous, 843 Guests (See full list)

  • Latest Articles

  • Posts

    • richard wysong
      Electrical Problem - solved

      By richard wysong · Posted

      Thanks for posting, I'm sure it will help someone
    • Brendan C
      2026 6.6 L5P oil cooler leaking oil at 4,000 miles

      By Brendan C · Posted

      New to diesel trucks. I happened to find my oil cooler leaking oil externally with only 4,000 miles on the truck. I didn’t realize this was an issue until I started researching it. Dealer is going to replace it under warranty but I’m wondering if there’s anything GM is working on to fix this issue. I’ve heard the oil filter used is the same as they use on their V6 motors and that’s what is causing the problems. Should I switch to a bigger filter or keep using the OEM recommended? 
    • Vu1can
      Seems to be Missing a lot of Updates

      By Vu1can · Posted

      So, GMCustomerService:  Judging by the Update History pictured above, is this truck missing any updates that it actually needs. If it's just for the infotainment system, the radio is working fine and no trouble with SeriusXM. and Android Auto is working fine wirelessly with my phone. Some months ago, an update notice was sent to my truck. I approved the update and it finished saying that the update was successful, but it seems that whatever that update was, it didn't actually get installed - at least not if I'm to go by the Update History shown above.   So, again, are there any updates that this truck really should have? I've checked with my dealer but they're reluctant or commit to anything and if I want them to check, they require a $200.00 fee just to check it out and then I'd have to pay for the actual update(s).    Ignorance is bliss, and if none of the updates goes to fixing any mechanical discrepancies, I'll just leave things as is.  
    • CNH-320
      Electrical Problem - solved

      By CNH-320 · Posted

      Hey everyone, I recently had an issue with my 07 2500HD GMT900. My DRL’s stay on at all times. Right front turn and right mirror turn signal indicator stay on solid at all times. By “at all times” I mean the only way to make them go off is disconnecting the battery. I tore the headlight assemblies out, tried disconnecting the harnesses to eliminate bad wiring at the harness, I unplugged the headlight switch, no change and the mirror turn signal still stayed on. My first thoughts were : Bad bulb and/or socket somewhere, under hood fuse panel bad, bcm bad, tail light or trailer wiring problem, or some random short to power in the harness.  Possibly a bad ground but unlikely. I had a big clue in the fuse panel, it had a burnt smell. I started pulling every fuse that had to do with DRL or right turn/park lamp. Nothing made the right directional turn off but pulling the DRL2 fuse made the DRL’s go out.  After studying wiring diagrams, I found that both problems had that fuse panel in common, the bcm also controls both problems but knowing the fuse panel had a burnt smell I removed and disassembled the fuse panel and found a little corrosion on the printed circuit board.  I ordered a new fuse panel from Amazon for like $260. When it arrived I installed it, and put everything back together, the problem was fixed. I figured the fuse panel needed to be replaced anyway so that was a logical place to start. Hopefully this story helps someone in the future. Regretfully I didn’t scan for codes before I did everything.
    • 2022LtTbZ71
      Service 4wd, ESC light, traction control light on, Service charging system (vehicle may stall)

      By 2022LtTbZ71 · Posted

      That stinks. I’m sitting on the side of the road right now with the same issue. Never had an issue before taking it in for the ground strap recall. Now I’m outside of warranty and they’ll probably want $200 just to diagnose what they already “fixed”. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...