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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 04-25-2015, 01:29 PM   #11 (permalink)
Moneypitt
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Well the CEL went off and the code cleared on its own

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Old 05-16-2015, 04:35 AM   #12 (permalink)
Lannan575
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Quote:
Originally Posted by Moneypitt View Post
Well the CEL went off and the code cleared on its own
Mine comes on like once a week and I clear it and then about a week or so later it will come back on again. Has anyone else fixed the problem with something other than heater replacement? And how much does that element replacement cost? Thanks

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Old 05-24-2015, 09:46 PM   #13 (permalink)
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Has anyone solved this issue?!?! Help !!
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Old 12-01-2015, 07:08 PM   #14 (permalink)
Moneypitt
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Well the code just came back and now it will not clear
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Old 12-03-2015, 01:13 AM   #15 (permalink)
Lannan575
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If you take this to a shop to get diagnosed please post in here. I clear the code like once a week it intermittently comes on for no reason . 😭
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Old 12-03-2015, 01:21 PM   #16 (permalink)
Moneypitt
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Originally Posted by Lannan575 View Post
If you take this to a shop to get diagnosed please post in here. I clear the code like once a week it intermittently comes on for no reason . 😭
Sure no problem, i am just hope it does not put me into reduced engine power. It is my work truck and I am booked for the next two weeks, so it will be a bit.
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Old 12-03-2015, 05:42 PM   #17 (permalink)
redwngr
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Not weather related.

If the tank heater circuit has an open, the heater has failed, or there is a harness/connector problem.
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Old 12-03-2015, 09:34 PM   #18 (permalink)
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I have replaced dozens of heaters (there's 3). Never had a wiring issue yet. The three heaters are located in the DEF pump, the DEF injector supply line and the DEF reseviour (looks a lot like the pickup on a fuel pump or fuel sending unit in the fuel tank).

Typically diagnosis is checking current draw for the heater in question when it's commanded on, GM has very good specs (don't have have them in front of me now though). Haven't seen one yet that read 0A (indicating an open circuit/damaged wiring) I would install a test light across the connector and command the heater on again, if the lamp lights, bad heater. If amperage is out of spec, bad heater.

Very common.

Lots of guys on here saying "got my tank replaced" and I wonder if all that was replaced was the reseviour.

Last edited by rob1; 12-03-2015 at 09:34 PM.
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Old 12-09-2015, 12:23 PM   #19 (permalink)
flippindc3
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My 2013 is at the dealership as I type this. They said P21DD is, as we know, an issue with the reduction tank heater. Spec says it should be from 5 to 7 amps, mine is at 3.46 max. They quoted me $679 to replace, I believe the heater plus tank. They say the truck will eventually go in limp mode...I would rather put the $679 towards deleting this system!
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Old 12-09-2015, 11:27 PM   #20 (permalink)
redwngr
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You have enough miles on it that it's not covered by the emissions warranty?

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