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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.


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Old 03-05-2015, 05:34 PM   #1 (permalink)
sfrandrup4434
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Error code P21DD

I have a 2013 Duramax that of course has the stupid DEF, my check engine light came on Monday and Orielly's said the code it was giving was P21DD but there was no explanation...does anyone know what this means?

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Old 03-05-2015, 05:58 PM   #2 (permalink)
btexpress
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https://service.gm.com/gmspo/mode6/2013eparms.html

Page 304 of group 13OBDG09

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Old 03-05-2015, 06:20 PM   #3 (permalink)
sfrandrup4434
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Thank you! Do you know how to go about fixing it?
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Old 03-05-2015, 06:22 PM   #4 (permalink)
sfrandrup4434
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Do you know if it's due to weather? I live in AZ it doesn't get TOO cold here but I WAS playing in puddles on Sunday and I thought it could be from that...
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Old 03-05-2015, 06:23 PM   #5 (permalink)
btexpress
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No, mine has not misbehaved yet, 25,000 miles, I have a TechII and the GM SI information, just waiting until the day.
You might get under it and unplug, clean & put die-electric grease on them, Then reconnect, since you went through he water.
Did you read the description?
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2011 GMC 3500 Denali HD, Banks Exhaust From DPF Back, Stock Tune, Pullrite 22K Super Rail 5th Wheel Hitch. Pioneer AVIC-8200NEX Navigation Radio, Tailgate camera view moved from mirror to Navigation display, Pace Edwards Electric Bedlocker Tonneau Cover, with a 37 gallon Transfer Flow tank with Trax2 display, under it's canister, Chrome wheel opening moldings, Mirror mod, with forward led marker and turn signals and puddle lights. Member 993 of the Dually Club.

45' Dutchman Voltage Toy Hauler with side and rear view cameras to Nav. display, Kodiac Hydraulic disc brakes, Mor Ryde suspension and pin box.

SOLD: 2003 Silverado 2500 HD, Banks Exhaust from turbo back. Late model mirrors with forward led marker and turn signals and puddle lights, Pullrite 22K Super Fifth hitch with Super Rails, Brake Smart controller, Air horn mod, HID's and LED's

Last edited by btexpress; 03-05-2015 at 06:28 PM.
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Old 03-05-2015, 06:33 PM   #6 (permalink)
sfrandrup4434
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I have 46000 on mine, my husband is going to love me for this one I sent him the information on it. It couldn't have been an easy code like replacing a gas cap. Thank you so much for the information!
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Old 03-06-2015, 10:07 PM   #7 (permalink)
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It's likely that the heater that the code pertains to is faulty - at the dealer we would use the scan tool to monitor the amperage drawn by the heater in question and compare it specs. Can't open SI on my phone or I'd say what that is.

I wouldn't just replace the part without actually testing though.

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Old 03-06-2015, 11:01 PM   #8 (permalink)
Ramblinrodney
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Found this.
2013 gmc, 16,370 miles, cel on with P21dd code and is currently at dealership for def heater element replacement. Vehicle has been there since April 1st and waiting for part to show up the week of the 14th from gm. So my vehicle will be there over two weeks and not very happy.

Is it under warrenty yet?
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Last edited by Ramblinrodney; 03-06-2015 at 11:07 PM.
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Old 04-22-2015, 08:50 PM   #9 (permalink)
Moneypitt
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Just had this code show up today on my 2013 with 31,300 miles on it.
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Old 04-22-2015, 11:46 PM   #10 (permalink)
eric2063
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Mine went south Sunday, it's sitting in Kellogg waiting for the part to get here from Reno. Maybe fixed by Friday, I'm getting prices for a full delete. It's been in the shop 3 weeks already since January for DPF/Emissions issues

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