Diesel Particulate Filter Regeneration Status

The vehicle's computer monitors when the diesel particulate filter is full and needs cleaning. This code means it's reporting a problem with that cleaning process.

The engine control unit (ECU) is monitoring the diesel particulate filter (DPF) pressure difference and exhaust temperatures during regeneration cycles. It expects a specific temperature range (typically above 600°F) and a reduction in pressure difference across the filter during the process.

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 11. Check the DPF for obvious damage or excessive soot accumulation.
2. 22. Inspect wiring and connectors related to the DPF pressure and temperature sensors for signs of wear or corrosion. Repair as needed.
3. 33. Verify fluid levels, especially diesel exhaust fluid (DEF) if applicable, and top off if low.
4. 44. Read live data from the engine control module; check for actual exhaust temperatures and pressure differential readings. Compare against expected values for regeneration process.
5. 55. If readings are out of spec, replace faulty sensors before rechecking the system.
6. 66. If all parameters are normal but the code persists, check for ECM software updates or perform a forced regeneration if available.

• Clogged or failing diesel particulate filter (DPF)
• Faulty temperature or pressure sensors
• Exhaust leaks affecting pressure calculations
• Faulty engine control module (ECM) software
• Insufficient fuel for regeneration process

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