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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 01-05-2018, 12:54 PM   #1 (permalink)
jeephauler
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Dorman DEF tank heater

Has anyone tried this aftermarket DEF tank heater? Dorman part# 904-374. I pretty much always have the P21DD code, and intermittent CEL. Seems nu rhyme or reason as to when the CEL will come on. Not always on the coldest days. 2013 LML with custom tune. Would rather deal with this issue myself. Thanks.

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Old 01-05-2018, 01:15 PM   #2 (permalink)
CntrlCalDmax
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Just making sure you are aware of the extended warranty on this part. It's 120K miles and 10 years.

Just checked and found it's listed for 2011 & 2012 years. I'd still check with GM unless you're past 120K miles.

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Old 01-05-2018, 01:18 PM   #3 (permalink)
jeephauler
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I'm aware. I'd rather spend $200 on parts and fix it myself than let the local dealer let it sit in their lot and get beat and scratched up waiting for repairs.
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Old 01-05-2018, 01:23 PM   #4 (permalink)
CntrlCalDmax
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I understand completely and do the same most times. My dealer had parts in stock and did it in a day. Also, I think it takes a Tech2 to complete the repair.
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2012 GMC LML/ALY 4X4 SLE CC 3500HD DRW - STOCK - FuelBox 60 gal Aux tank/Tooll box - Just fits in the garage, Air Lift Bags with SmartAir Leveling System, Exergy Fuel System Saver, Kennedy Single LP.

2007 Mobile Suites 36' TK3 Demco Glide Ride Pin, weighs 17,500# loaded.

2007 GMC LBZ/ALY 4X4 SLT CC 3500 DRW - TransferFlow Tank Tool Box Combo, EFILive DSP5, MBRP, Fred's 1.5 spacers, BD Exhaust Brake.
2004 GMC LLY/ALY 4X4 SLT CC SB, EFIlive, Mike L SCIV, TRADED
2001 Chevy LB7/ALY 4X4 EC SB - SOLD to neighbor

Last edited by CntrlCalDmax; 01-05-2018 at 01:24 PM.
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Old 01-05-2018, 01:28 PM   #5 (permalink)
jeephauler
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Well that sucks. Why sell the parts aftermarket if you still have to take it to a dealer to complete the repair?
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Old 01-05-2018, 01:51 PM   #6 (permalink)
jeephauler
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I'm seeing scanners called GM Tech2 diagnostic scanners for less than $300. Would that be the needed tool, or are you referring to something else. I already have a rather expensive Actron OBDII scanner, but it will not allow me to delete the P21DD code, which it labels as "Permanent". Thanks.
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Old 01-05-2018, 04:44 PM   #7 (permalink)
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Quote:
Originally Posted by jeephauler View Post
I'm aware. I'd rather spend $200 on parts and fix it myself than let the local dealer let it sit in their lot and get beat and scratched up waiting for repairs.
GM Part :23379348 RESERVOIR KIT, Evaporation Emission System(Fuel Tank End)
RESERVOIR KIT,EMISSION REDUCTION FLUID TANK(INCLUDES 3,4,13-16)(INCLUDES TEMPERATURE SENSOR & HEATER) $174.00

How much is the Dorman part# 904-374

Last edited by Rvn4me; 01-05-2018 at 05:09 PM.
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Old 01-05-2018, 10:47 PM   #8 (permalink)
willydmax
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Quote:
Originally Posted by jeephauler View Post
Has anyone tried this aftermarket DEF tank heater? Dorman part# 904-374. I pretty much always have the P21DD code, and intermittent CEL. Seems nu rhyme or reason as to when the CEL will come on. Not always on the coldest days. 2013 LML with custom tune. Would rather deal with this issue myself. Thanks.
Why do you have a working DEF system with a custom tune? Full emissions tune? I've tuned several trucks with Kennedy diesels "limited emissions" tune and it eliminates the DEF system and EGR and associated check engine lights without unplugging anything or modifying exhaust. Runs clean with less regens.
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Old 01-06-2018, 07:16 AM   #9 (permalink)
jeephauler
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Quote:
Originally Posted by willydmax View Post
Why do you have a working DEF system with a custom tune? Full emissions tune? I've tuned several trucks with Kennedy diesels "limited emissions" tune and it eliminates the DEF system and EGR and associated check engine lights without unplugging anything or modifying exhaust. Runs clean with less regens.
That I can't answer. Its a mild performance tune he wrote for me mainly to address a dead pedal issue my truck had. Works great. All emissions systems are functional. Do not the best of my knowledge have a tune named "limited emissions" or one which does that.
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Old 01-06-2018, 08:05 AM   #10 (permalink)
dmax3500
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Originally Posted by jeephauler View Post
I'm aware. I'd rather spend $200 on parts and fix it myself than let the local dealer let it sit in their lot and get beat and scratched up waiting for repairs.


so the dealer just and beats up and scratchs your truck?


because why?,
they don't want you as a customer?
ive worked at new car dealers for 25+ years,and haven't seen anything like this done

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