DPF Error Codes Explained

When a diesel vehicle displays a DPF warning light or enters limp mode, the onboard diagnostics system generates a fault code to indicate the underlying issue. Interpreting these codes is the key to fast, effective repairs and avoiding costly damage.

Common DPF Error Codes and Their Meanings

Code	Description	Typical Causes & Actions
P2002	DPF Efficiency Below Threshold	Excessive soot buildup; try regeneration, cleaning, or replacement
P2463	DPF Restriction - Soot Accumulation	Soot/ash accumulation; initiate regeneration, clean or replace DPF
P242F	DPF Regeneration Incomplete/Ash Accumulation	Incomplete regeneration, sensor faults, exhaust leaks; check and address cause
P2458	DPF Regeneration Taking Too Long	Excessive soot, inefficient regeneration; inspect injectors/airflow
P2459	DPF Regeneration Frequency Too High	Frequent regens; check for frequent short trips and educate on driving habits
P246C	DPF Soot Accumulation (Bank 1)	Targeted soot buildup; perform regeneration or cleaning
P246B	DPF Soot Accumulation (Bank 2)	As above, but for the second cylinder bank
P2452	DPF Pressure Sensor Circuit Low	Sensor or wiring fault; inspect/replace sensor
P2453	DPF Pressure Sensor Circuit High	Sensor or wiring fault; inspect/replace sensor
P244A	DPF Differential Pressure Too Low	Faulty sensor, clogged DPF, or exhaust leak; inspect system and repair

Why Understanding DPF Codes Matters

Prompt identification and resolution of DPF error codes prevent costly engine or filter damage and ensure compliance with emissions regulations. If left unresolved, DPF issues can escalate, and in severe cases, require a full filter replacement.

Final Tip

Vehicle codes may vary slightly by manufacturer; always verify with your vehicle’s manual or a professional technician for exact guidance on your model.