P20A5 OBD-II: Reductant Purge Control Valve Stuck Closed
P20A5 Severity
Should you fix P20A5 yourself?
Identifying an OBD code is just the start of a complete diagnostic routine. Most trouble codes are caused by a sensor reporting a value that is out of range. Just replacing a sensor may not fix underlying issues. Be sure to understand the code, the part or system in your car that the code refers to, and the risks of delaying professional repair.
Proper diagnosis will save you time and money on unnecessary repairs.
Urgent codes indicate immediate action is necessary. These are urgent and significant malfunctions that can cause severe damage to the vehicle or harm the driver and passengers.
What causes OBD-II fault code P20A5?
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. the injection of DEF Fluid into the exhaust stream brings Diesel Particulate Filter (DPF) up to temperature. The system is then able to convert harmful NOx to Nitrogen, Carbon Dioxide, and water. The Reductant Catalyst (SRC) was added to further reduce any NOx was still in the exhaust stream. The Reductant Purge Valve controls the flow of DEF (Diesel Exhaust Fluid) from the pump to the injector. If the Reductant Purge Valve does not operate as requested by the engine computer, code P20A5 will set.
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OBD II Fault Code
- OBD II P20A5
OBD-II Code Powertrain Control Module (PCM) failure is defined as a Reductant Purge Control Valve Stuck Closed
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. the injection of DEF Fluid into the exhaust stream brings Diesel Particulate Filter (DPF) up to temperature. The system is then able to convert harmful NOx to Nitrogen, Carbon Dioxide, and water. The Reductant Catalyst (SRC) was added to further reduce any NOx was still in the exhaust stream. The Reductant Purge Valve controls the flow of DEF (Diesel Exhaust Fluid) from the pump to the injector. If the Reductant Purge Valve does not operate as requested by the engine computer, code P20A5 will set.
Powertrain Control Module (PCM) failure Symptoms
- DPF regeneration may not occur
Common Problems That Trigger the P20A5 Code
- Powertrain Control Module (PCM) failure
- Reductant purge valve failure
- Wiring issue
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