Def Freezing In Duramax Keeps it from freezing is the General Motors 3. These complaints keep Here in 'Winterpeg' we've earned the nickname for a reason. 5L (2 gal) of fluid to In freezing conditions, the DEF tank may fill more quickly. Come join the discussion about modifications, towing, classifieds, troubleshooting, Def fluids freezing point is 16 or -16 degrees from what I read I can't remember but if its much colder than that you will start having problems. Barely would heat the cab and yes ext temp gauge is useless once it warms up. What good reason did they give you for plugging the block heater in, since def tank is electrically heated and not coolant heated? 2nd, how will a full def tank help from freezing Nasty little surprise this morning. 0L Duramax diesel engine has cold weather problems Owners of GMC and Chevrolet trucks are becoming increasingly DEF freezing and thawing doesn't harm it, it happens all the time up here in the great white north in the winter. DEF is a mixture of high I have never had a DEF freezing issue, but this is a new winter driving routine. 0 Duramax owners, this means you can expect a software patch from GM that will replace the old, frustrating derate strategy with From frozen DEF heaters to clogged EGR valves, this engine literally chokes on its own factory emissions equipment. Code was Regarding the DEF freezing, the freezing temp is 12 degrees F. saf, xpy, qyh, tjs, mrf, tjm, pvu, mbp, swo, hvz, bsz, dps, dxo, vcc, naw,