P242F OBD-II: Diesel Particulate Filter Restriction - Ash Accumulation
P242F Severity
Should you fix P242F 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 P242F?
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) monitor the exhaust pressure before and after the DPF. After Regeneration (burning off of the particles captured) is complete, the exhaust pressure should decrease. If it does not, the PCM assumes that there is a restriction in the DPF. Code P242F will set.
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OBD II Fault Code
- OBD II P242F
OBD-II Code Powertrain Control Module (PCM) software needs to be updated is defined as a Diesel Particulate Filter Restriction - Ash Accumulation
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) monitor the exhaust pressure before and after the DPF. After Regeneration (burning off of the particles captured) is complete, the exhaust pressure should decrease. If it does not, the PCM assumes that there is a restriction in the DPF. Code P242F will set.
Common Problems That Trigger the P242F Code
- Diesel Particulate Filter (DPF) failure
- Powertrain Control Module (PCM) software needs to be updated
- Vehicle needs to be driven on longer trips
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