P242F - DIESEL PARTICULATE FILTER RESTRICTION - ASH ACCUMULATION

POST UPDATED IN September, 2021

Description of DTC code P242F Generic

The Diesel Particulate Filter (DPF) is located upstream of the catalytic converter. This filter traps soot particles and holds them until they are expelled from the exhaust pipe. The design of the DPF system allows removing up to 90% of the carbon residues from the exhaust.

When the Diesel Particulate Filter has high levels of soot, it becomes clogged. As a result, the exhaust pressure increases. The filter backpressure is monitored and the regeneration process is initiated based on this pressure obtained by the vehicle’s computer through the Exhaust Pressure Sensor (EPS),

If the PCM detects DPF system regeneration failures due to excessive amounts of carbon residue buildup, the P242F OBD2 diagnostic code will be set. On some vehicles, the Powertrain Control Module will reduce engine power until the amount of stored soot is reduced.

Symptoms of fault code P242F Generic

  • Check Engine light ON.
  • The exhaust pipe has excess emissions.
  • Problems to maintain RPM.
  • The engine temperature increases.

Causes of OBD2 P242F Generic

The P242F OBDII fault code is set for the following reasons:

  • The wiring harness associated with the DPF may be defective.
  • Possibly, the Diesel Exhaust Fluid level in the filter is low.
  • The DPF pressure sensor may have internal damage.

Possible solutions of the DTC code P242F Generic

To solve the DTC P242F OBD2 code, follow these steps:

  • Consult the Technical Service Bulletins (TSB), it will help make the diagnosis
  • Check that the electrical connections of the DPF system are in good condition. If you notice any defective wires or connectors, make the necessary repairs.
  • Check that the Diesel Exhaust Fluid (DEF) level is appropriate. If this value is not the required value, verify that it is not due to leaks or blockages in the system. Make corrections as required.
  • Use a DVOM and test the DPF pressure sensor for voltages and resistance. If the reading does not match the specified reading, it is recommended that you check its associated wiring and replace the sensor if necessary.

 

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