What is a reductant tank heater?
OBD-II Code P202B is defined as a Reductant Tank Heater Control Circuit Low. Newer diesel vehicles have a Diesel Particulate Filter to reduce soot emissions. This filter uses DEF Fluid to assist in the burning off soot. The Reductant Tank Heater heats the DEF Fluid to the temperature is more efficient.
What does a reductant tank do?
The Reductant Catalyst (SRC) was added to further reduce any NOx that was still in the exhaust stream. The Reductant Temperature Sensor tells the engine computer (PCM) the temperature of the DEF in the tank. If the PCM detects an implausible signal from the Reductant Temperature Sensor, code P205B is set.
Do DEF tanks have heaters?
Most systems have a built-in DEF tank heater that will thaw the fluid during normal vehicle operation. If your vehicle’s SCR has a built-in DEF tank heater, turn the vehicle on to initiate the thawing process.
Where is the reductant tank heater?
The reductant heater and sender assembly heating element is located directly above the pickup tube inlet filter.
How big is the DEF tank on a 2020 Duramax?
7 Gallons
6.6L L5P Duramax Engine Specs
| Manufactured Years: | 2017-2021 |
|---|---|
| Engine Oil Capacity: | 10 quarts or 9.5 Liters |
| DEF Fluid Capacity: | 7 Gallons |
| Cooling System Capacity: | 31.4 Quarts or 29.72 Liters |
| Fuel: | B20 Biodiesel Blend or Ultra Low Sulfur Diesel |
What is a reductant quality sensor?
The engine computer (PCM) monitors the Reductant Catalyst System’s use of DEF and its ability to convert NOx to Nitrogen, Carbon Dioxide, and Water. The PCM uses a Reductant Quality Sensor to monitor the performance of the Reductant system. If the sensor sends back an implausible signal, code P206B is set.
How do I fix code P205B?
How To Correct P205B Reductant Tank Temperature Sensor Circuit Range/Performance
- Make sure to mend faulty electrical connection.
- It is essential to restore the flawed reductant pump control.
- Rehabilitate the defaults in the wiring harness.
- Carefully adjust the leakage in the exhaust.
How long does a DEF tank heater last?
If the DEF is stored at ambient temperatures of 75 F with no major periods of exposure to heat over 86 F then the batch of DEF will last roughly two years. If a package of DEF is exposed to periods of heating the fluid will last approximately one year.
What temperature does DEF freeze?
12°F
Diesel Exhaust Fluid or DEF Fluid Whether in storage tanks or in equipment, DEF can freeze and possibly cause issues. As temperatures drop below 12°F, DEF will begin to solidify and not work as intended.
How does a reductant heater work?
The reductant is a good conductor of electricity. When the reductant tank is full, the reductant closes a circuit between all three level electrodes and the ground electrode, indicating the tank is full. As the reductant is consumed, the level drops and uncovers each electrode in sequence.