P20CA OBD-II: Reductant Injection Air Pressure Leakage
P20CA Severity
Should you fix P20CA 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 P20CA?
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 Pressure Sensor allows the engine computer to monitor pressure in the Diesel Particulate Filter (DPF) System. If the sensor sends back an implausible signal, code P20CA is stored.
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OBD II Fault Code
- OBD II P20CA
OBD-II Code Powertrain Control Module (PCM) failure is defined as a Reductant Injection Air Pressure Leakage
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 Pressure Sensor allows the engine computer to monitor pressure in the Diesel Particulate Filter (DPF) System. If the sensor sends back an implausible signal, code P20CA is stored.
Powertrain Control Module (PCM) failure Symptoms
- DPF regeneration may not occur
Common Problems That Trigger the P20CA Code
- Powertrain Control Module (PCM) failure
- Reductant pressure sensor failure
- Wiring issue
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