Diagnostic trouble code (DTC) P20B9 stands for “Reductant Heater “A” Control Circuit/Open.” This code sets when the reductant heater doesn’t perform as expected. The P20B9 engine code can also be triggered if the powertrain control module (PCM) doesn’t detect voltage in the reductant heater A’s control circuit.
How do I fix code P20B9?
How To Correct P20B9 Reductant Heater A Control Circuit/Open
- Changing the broken reductant heater ‘A’ control circuit.
- The opening or the shorted circuit of the reductant heater ‘A’ control must be quickly fixed.
- Quickly replacing the dirty diesel exhaust fluid.
- Replacing the broken glow plugs.
What is a reductant heater a control performance?
OBD-II Code P20BA is defined as a Reductant Heater “A” Control Circuit Performance. Diesel Exhaust Fluid (DEF) is used to assist in converting leftover exhaust particles to harmless gases. In order to burn off those particles, the temperature of the exhaust system needs to increase.
What module controls the reductant tank pump and line heaters?
The reductant heater control system is used by the Powertrain Control Module (PCM) to heat up the Diesel Exhaust Fluid (DEF) to prevent it from freezing.
Where is def heater located?
DEF Dosing Line Heater – A DEF dosing line heater is located at the end of the DEF dosing line where it meets the DEF pump. This heater is used to heat the dosing line between the DEF pump and the DEF dosing valve to prevent freezing during vehicle operation.
How do you test a DEF heater?
Zitat von Youtube: Now we're asked to disconnect the harness to the acm. And check resistance through each leg of the circuit. Basically this continuity test is intended to check the integrity of the circuit or harness.
What temp does DEF freeze?
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.
Where is the reductant heater located?
The reductant heater is a component that is used to prevent diesel exhaust fluid from freezing or crystallizing in low temperatures. It is usually located in the diesel exhaust fluid filter reservoir and/or the reductant injector supply hose(s).
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 is a reductant control module?
OBD-II Code Diagnostic Trouble Code is defined as a Reductant Control Module Requested MIL Illumination. Diesel Exhaust Fluid (DEF) is used to assist in converting leftover exhaust particles to harmless gases. In order to burn off those particles, the temperature of the exhaust system needs to increase.
What is a reductant relay?
This type of relay is a contact type that activates with a signal wire from the ignition switch. To avoid voltage spikes and possible controller damage, the relay must gradually de-energized. Of the power relay to the reductant control module de-energizes too quickly, OBD code P20EA gets stores in the system.