Quote:
Originally Posted by BigBobIa
Can DEF freeze? Gauge read quarter tank. Added 4+ gallons and gauge did not move driving 5 miles home. High around +10°f today. (-11° this morning)
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Your truck is equipped with a DEF tank heater. If the tank heater fails you will get a code (check engine light). The one in my Ford failed a couple of years ago but Ford was aware they had a problem and they covered it.