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Chevy / gmc 2500hd duramax – p20b9-00 reductant heater problem – part ii – Auto Repair Chat

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NOTICE: After the first video played GM saw it and immediately took action to help the customer and take up matters with the dealer to resolve all the issues! Good mark on GM for stepping up to the plate!!
Lets fix this 2011 Chevy 2500HD with a Duramax Diesel now that we know what is wrong with it. This is the one that was brought to me by the customer after having it at the local dealer for 3 WEEKS and they told him they could not repair it and suggested he buy a new truck?!?! The engine light was on with a code P20B9-00 Reductant Heater Problem. 1, 2 Bar-B-Que lets fix this ol'chivy!
Did you miss part I?: https://www.youtube.com/watch?v=9g6h2IEd9so
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Just ship it here:
South Main Auto Repair
47 S. Main St
PO Box 471
Avoca, NY 14809
Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of South Main Auto Repair, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not South Main Auto Repair.

50 thoughts on “Chevy / gmc 2500hd duramax – p20b9-00 reductant heater problem – part ii”
  1. Avataaar/Circle Created with python_avatars john grein says:

    Got a 2012 d-max and the def heater went out (it was mid summer 80+degrees) while we were camping a few years ago. Had to come home immediately because the truck had just enough miles left before speed limitation kicked in. Truck had about 22k on it at the time. GM fixed it under a campaign due to def heater troubles. No charge. very thankful. But I did pay for a NOX sensor then.
    Now the same truck has 27k on it and got DEF fluid bad. Dealer has had the truck 6 weeks now and DEF repairs are running so far at $2,400. Plus, another new NOX sensor at $600, and leaking steering box $1400. Looking at $4,400 approx right now. Truck does not plow and is put away in the winter. Live in WNY outside of Rochester. The storage aggravates the def and it gets old. Not driven enough to use up the DEF before it gets old. I only add a gallon at a time when it needs it and discard the rest.
    I do believe that the dealer is doing their best. It is a design issue- not very robust for sure.

  2. Avataaar/Circle Created with python_avatars lopez contruction says:

    And by the way I just recently discovered your channel thanks a lot again

  3. Avataaar/Circle Created with python_avatars lopez contruction says:

    Thank a lot sir, I really appreciate you going through the steps for us regular guys, looking for something like this…
    I have the same problem..
    But after seeing your video there is no doubt in my mind that I could do it as well

  4. Avataaar/Circle Created with python_avatars David Longman says:

    If this doesn't make the manufacturers examine the dealership nothing will!

  5. Avataaar/Circle Created with python_avatars tim WILSON says:

    All the new diesel's are junk ever since the EPA started the mandate requirement for particular filters and diesel exhaust injection fluid injectors no matter if it's a Ford Chevy Dodge Kenworth Freightliner Peterbilt whatever . They all require constant maintenance every time you turn around sometimes multiple times per week and none of the dealers can ever seem to get them right you spent more time on that one than I think most of the shops that work on them doing a week for about 10 of them which probably answers why it never gets done right at the dealerships or God forsake Penske.

  6. Avataaar/Circle Created with python_avatars David Brosius says:

    I wonder if GM paid Big 0. for the service.

  7. Avataaar/Circle Created with python_avatars Chris Kingery says:

    What Autel scanner are you using, thanks for the video I replaced my DEF heater today and need to clear the DEF code.

  8. Avataaar/Circle Created with python_avatars Warren Hiett says:

    I'm aparently way behind in viewing your Youtube videos, but I only recently dicsovered your channel. Got a lot of catching up to do. Anyway, near the end of this video (Dec. 5, 2015) you picked up the "little bag of goodies" that had not been used. It occurred to me that those items were caps and plugs for the openings you had covered with items from your box of plugs and caps collection. I may be way off base, but just thought I'd put in my 2cents worth.
    Still loving your channel and watching 2 or 3 videos per day. Keep up the great and entertaining work.

  9. Avataaar/Circle Created with python_avatars Chris Bentley says:

    Is there anything you can't fix? Nice one Mr O. Would be nice to have heard the conversation between GM and the Dealership. But if it's still under warranty then doesn't this void the entire Warranty on the Truck even if they couldn't fix it? Dealership 'get out clause'. I know what they are like.

  10. Avataaar/Circle Created with python_avatars ed s says:

    Ive had this prolbem with my 2014 GMC. deelers and most diesel mechanics will scam you and replace parts that are perfectly good because they know that the avrage person dosent have the scan tool to run the tests even if they change out the heater

  11. Avataaar/Circle Created with python_avatars Steve Leon says:

    I see these type of codes on the 6.7L Ford Diesel engines and replacing that sender is almost always the fix. Great diag on this one. You were right, this is a gravy job

  12. Avataaar/Circle Created with python_avatars fishin11 says:

    Love your videos, I think your brilliant. I’m a marine tech and what I’m curious about is why you don’t check/test the part, in this case the heater before you put the tank back in the truck. (Unless you do off camera). There has been quite a few times either me or my fellow mechanics, have put in new parts and they don’t work, then it’s got to come apart again. We test, if possible before putting back together.

  13. Avataaar/Circle Created with python_avatars claymore cluepile says:

    you remind me of a wolverine or a tasmanian devil…when it sets eyes on the target it never lets go until the prey item is entirely within the belly of the wolverine…..i don't understand why the gods permit you to do miracles with cheap brittle plastic while every time i try to do something similar the plastic ends up cracked and broken into about 4 pieces…..very good video….you seem to be able to regularly do things that more or less defy the laws of physics

  14. Avataaar/Circle Created with python_avatars Paublus Americanus AMERICANUS says:

    My bet is as soon as they saw the Vin didn't pertain to this vehicle they stopped and did not go on like the Obrechta Polish wonder.

  15. Avataaar/Circle Created with python_avatars Antonio Claudio Michael says:

    Wow at the End Needing the fire truck and It burning the oil to bits and unusability @SouthMainAutoRepairLLC

  16. Avataaar/Circle Created with python_avatars Antonio Claudio Michael says:

    Great repair Eric O run each Heater at the end to allow it to do its circuit checks was pretty easy also good Video @SouthMainAutoRepairLLC

  17. Avataaar/Circle Created with python_avatars Antonio Claudio Michael says:

    Nice to see you got just the Heater and Not the entire Tank Eric O @SouthMainAutoRepairLLC

  18. Avataaar/Circle Created with python_avatars Antonio Claudio Michael says:

    Very nice Gm Seen Part 1 and made It right @SouthMainAutoRepairLLC

  19. Avataaar/Circle Created with python_avatars Steve Rose says:

    Just changed mine but can't find anyone with a scanner to clear / turn heaters on off .what types of scanner work?

  20. Avataaar/Circle Created with python_avatars Dan Nickum says:

    what is the name brand of you code reader

  21. Avataaar/Circle Created with python_avatars johnashb says:

    What model scanner are you using please?

  22. Avataaar/Circle Created with python_avatars Dwight Evitt says:

    You Rock man. Even Identifix was sketchy…

  23. Avataaar/Circle Created with python_avatars Evan Wilson says:

    How do you cycle the heaters? My shop has the Snap On Apollo scanner and have done some googling, and I can't find anywhere that tells me how to toggle them on and off.

  24. Avataaar/Circle Created with python_avatars Chuck Neil says:

    GM should offer the whole DEF tank as a rebuilt or remanufactured unit so you wouldn’t have to do all the fine details.

  25. Avataaar/Circle Created with python_avatars Michael Bazinet says:

    Second time watching this one. I never get tired of your vids very informative. I always learn something new. Thanks for the great work.

  26. Avataaar/Circle Created with python_avatars Ed says:

    This is good stuff. You actually have the right tools :). And smart about looking at codes and specifications with a cautious eye. As we saw in part one with the wires changing colors. It also helps with my understanding about these repairs can get expensive. thanks!

  27. Avataaar/Circle Created with python_avatars svetlana t says:

    You gave me hope working on my truck

  28. Avataaar/Circle Created with python_avatars ghhtrainmaster says:

    Those zip ties are probably “ tattle tails “

  29. Avataaar/Circle Created with python_avatars Mitch van Kesteren says:

    Good old DEF, saving the environment one plastic jug and cardboard box at a time! Where I’m from, that garbage gets removed the minute warranty is over!

  30. Avataaar/Circle Created with python_avatars taltonbane says:

    Diesel repair manual,first remove cab

  31. Avataaar/Circle Created with python_avatars Peter Hallez says:

    Thanks so much! This video saved me time and money. It took me around 1 hour to complete the job and it fixed the problem. Thanks again!!

  32. Avataaar/Circle Created with python_avatars Elrique Suave says:

    Bro, i think 70% of the mechanic shops in america need to have classes on just watching your videos!!!

  33. Avataaar/Circle Created with python_avatars Elrique Suave says:

    GM still full of crap!!! they couldve just done this in the beginning instead of telling him he needed a new truck! smh

  34. Avataaar/Circle Created with python_avatars B Souza says:

    You said it was over but the FAT lady hadn’t sung 😕. Seriously, great VIJAYO! 👍

  35. Avataaar/Circle Created with python_avatars Big Texas says:

    What autel scanner did u use???

  36. Avataaar/Circle Created with python_avatars Shade Tree Mech says:

    The day before hunting season and you are working late in the garage? I'm glad I'm not you.

  37. Avataaar/Circle Created with python_avatars Freedom One says:

    Which Autel until will run reductant heater test and other reductant functions? Autel claims no support for this which is obviously wrong.

  38. Avataaar/Circle Created with python_avatars Bcjbiz Bcjbiz says:

    Awesome video very detailed. Thanks for sharing

  39. Avataaar/Circle Created with python_avatars Bass Hunter says:

    From what I gather (numerous blogs/vids) a diesel fuel system pump , injectors is extremely tighter (tolerances) than a gas system. So keeping contaminants out is a very good idea.

  40. Avataaar/Circle Created with python_avatars William Newton says:

    Mine didn't have a code, just poor quality Def fluid, they changed the injector

  41. Avataaar/Circle Created with python_avatars Hawk 1966 says:

    If GM made everything right with the customer;
    1) Why wasn't it replaced under warranty
    2) Did Eric do the job simply because the owner distrusted the dealer?
    Not that I begrudge Eric the cash flow but if my truck were under warranty the dealership would find a 'diesel guy' to do the repair or they'd be buying me a new truck. Don't have the whole story but this doesn't seem like GM did Jack squat for the owner. Big kudos to Mr. O for figuring it out on the fly.

  42. Avataaar/Circle Created with python_avatars G Kotten says:

    266$ for a hunk of plastic…holy space monkeys