Code P246C: Diesel Particulate Filter (DPF) Problem
Probable Causes:
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Clogged or damaged diesel particulate filter (DPF).
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Malfunction of the DPF regeneration system.
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Faulty electrical circuit (wiring, connectors, associated sensors).
Symptoms:
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Engine light illumination (or “Service engine soon” warning message).
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Reduced engine power (limp mode).
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EGR system deactivation.
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Increased pollutant emissions.
Meaning of Code P246C:
The diagnostic system monitors the restriction (soot accumulation) in the DPF. If the measured pressure exceeds a first predefined threshold for a determined duration, a warning light comes on. If the second threshold is exceeded, the malfunction indicator lamp (MIL) activates, engine power is limited, and the EGR valve is deactivated to protect the engine.
Diagnostic Steps:
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Visual inspection: Check the electrical harness, connectors, and sensors related to the DPF. Look for oxidized, broken, or poorly secured pins.
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Data analysis: Use an OBD-II scanner to check DPF differential pressures and associated errors.
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Regeneration check: Ensure the active DPF regeneration process is functioning correctly.
Repair Procedure:
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DPF replacement: If the filter is irrecoverable (severe clogging or crack), replace it with a part that meets manufacturer specifications.
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Code reset: Clear the P246C code with an OBD-II scanner after repair.
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Final verification: Perform a road test to confirm the disappearance of symptoms and that the code does not reappear.
Technical Tip:
Preventive maintenance (regular cleanings, use of quality fuel) extends the DPF’s lifespan. In case of frequent regeneration, also inspect the injection system and pressure sensors.