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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 12-24-2018, 12:06 AM   #11 (permalink)
Dmax Dually
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So those of use who live in warm climates will never know if our def heater is bad unless we travel north in the winter? Does the computer ever test it or you'll only know that it is bad when commanded on and it doesn't work?

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Old 03-04-2019, 06:28 PM   #12 (permalink)
Denali15
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I just had mine done in N Alabama. Was throwing the P21DD. The local dealer replaced the heater assembly. Light came on, went off for a day then never went off til I got it fixed. I'm not sure what temp that its supposed to keep it at though.

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Old 04-18-2019, 11:43 AM   #13 (permalink)
lost1wing
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I was told that the system checks itself at 40f. If it passes, the permanent code goes away. My code did go away at the first cold snap after dealer replaced the def tank unit.
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