def problems in cold weather - Chevy and GMC Duramax Diesel Forum
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Old 01-07-2013, 04:31 PM   eBay Motors  #1 (permalink)
 
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def problems in cold weather

Is the winter front fooling engine temp sensor and not allowing def heater to work properly in cold weather -20 and colder
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Old 01-07-2013, 06:31 PM   eBay Motors  #2 (permalink)
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Quote:
Originally Posted by edthewelder View Post
Is the winter front fooling engine temp sensor and not allowing def heater to work properly in cold weather -20 and colder
I am unsure, but good question.

Are you freezing up?

The heater may come on automatically when the truck realizes the (frozen) DEF is not reducing NOx enough. Your guess is as good as mine.

I would think the DEF tank heater would use the ambient temp sensor if anything though.

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Old 01-07-2013, 06:32 PM   eBay Motors  #3 (permalink)
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By the way, this is posted in the wrong place. Figured I'd help a welder out though. :P
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Old 01-08-2013, 06:07 AM   eBay Motors  #4 (permalink)
 
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Yes I meant ambient sensor blocked by winter front
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Old 01-10-2013, 03:21 AM   eBay Motors  #5 (permalink)
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I've heard there is a re-programming update on 2011's that increases the cycling frequency of the DEF tank heater. My 2012 recently had an issue with the DEF gauge reading 25% when it was actually full. Problem occurred after truck was exposed to sub and near zero temps. Dealer did a manual re-set of the instrument cluster and prob solved (for now?). Unsure if the cold temps we're a contributing factor or not.
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Old 01-10-2013, 09:36 AM   eBay Motors  #6 (permalink)
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Old 01-10-2013, 03:41 PM   eBay Motors  #7 (permalink)
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ed, we haven't heard from anyone from the far north having the problem you are asking about.
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