Can a Def heater fail on a 2016 Sierra 2500HD?
My 2016 Sierra 2500HD has 176,000 miles on it already and recently started eating parts. The latest part to fail was the reductant tank heater (DEF Heater). Upon cold start the check engine light came on with code P21DD. After a little reading I learned that this can result in “Limp Mode”. I was in the middle of nowhere in Northern Wyoming.
What is the code for a Duramax reductant tank heater?
By using a code reader the most common code is P20B9, DEF reservoir heater control open circuit/low voltage. The most common repair for the P20B9 code is either replacing or manually engaging the reductant tank heater.
Why did my 2020 HD 3500 tank melt down?
Another issue with the new body 2020+. The DEF tank heaters short out. Have to replace the entire tank with heaters and harness. Done 4 of them in the last few weeks. Waiting on parts for 5 more. The connector at the pump heater module shorts out. The connector pins are too small to carry the current that the heaters take. IMO.
When does the reductant tank heater go out?
The reductant tank heater operates along with other reductant heaters when temperatures drop below freezing and depending on the location, may never happen. Most owners will first find their reductant tank heater is out of specification by a check engine light.
My 2016 Sierra 2500HD has 176,000 miles on it already and recently started eating parts. The latest part to fail was the reductant tank heater (DEF Heater). Upon cold start the check engine light came on with code P21DD. After a little reading I learned that this can result in “Limp Mode”. I was in the middle of nowhere in Northern Wyoming.
By using a code reader the most common code is P20B9, DEF reservoir heater control open circuit/low voltage. The most common repair for the P20B9 code is either replacing or manually engaging the reductant tank heater.
The reductant tank heater operates along with other reductant heaters when temperatures drop below freezing and depending on the location, may never happen. Most owners will first find their reductant tank heater is out of specification by a check engine light.
What kind of exhaust heater does a Silverado have?
Make sure this fits by entering your model number. 6.6L V8 Diesel Exhaust Fluid Def Pump Diesel Emissions Fluid Heater Kit for 2012 2013 2014 2015 2016 Chevrolet Silverado 2500 HD 3500HD GMC Sierra 2500 HD 3500HD Duramax LML LGH Includes all necessary components for a complete repair.