P246C OBD-II: Diesel Particulate Filter Restriction - Forced Limited Power
P246C Severity
Should you fix P246C 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 P246C?
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 engine computer (PCM) monitors the exhaust pressure before and after the Diesel Particulate Filter (DPF). Excessively high pressures on the inlet side indicate a restriction on the DPF. The PCM will set code P246C. The PCM may also limit power available from the engine to prevent damage to additional components.
OBD II Fault Code
- OBD II P246C
OBD-II Code Decreased engine performance is defined as a Diesel Particulate Filter Restriction - Forced Limited Power
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 engine computer (PCM) monitors the exhaust pressure before and after the Diesel Particulate Filter (DPF). Excessively high pressures on the inlet side indicate a restriction on the DPF. The PCM will set code P246C. The PCM may also limit power available from the engine to prevent damage to additional components.
Decreased engine performance Symptoms
- Decreased engine performance
Common Problems That Trigger the P246C Code
- Diesel Particulate Filter (DPF) failure
- Manual DPF regeneration must be completed
- Powertrain Control Module (PCM) failure
- Powertrain Control Module (PCM) software needs to be updated
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