P2459: Diesel Particulate Filter Regeneration Frequency
The DPF is regenerating more often than it should.
Green, yellow, red: three ways P2459 can look
The same code can be a quick fix or a reason to pull over. Match your situation to the closest example.
Keep an eye on it
Set after a stretch of short trips.
Schedule a repair
Regens keep happening. Diagnose the soot source soon.
Stop and get help
Derate or overheating exhaust. Stop driving.
Symptoms you might notice
- Frequent regens
- Higher fuel use
Common causes, cheapest first
- Upstream soot problem: injector, EGR, boost leak
- Faulty DPF pressure sensor or hoses
- Short-trip driving
What you can check before calling
- Note how often regens happen
A code points to a system, not a part. Replacing parts based on the code alone is how people spend money without fixing the problem. Testing confirms the cause first.
Want the full story? Read our guide: DPF regeneration explained: passive, active and forced.
Generic codes (second character 0) mean the same thing on every vehicle. Some manufacturers add their own details, so check service information for your exact vehicle.
Related codes
More diesel & cummins codes
- P2002
Diesel Particulate Filter Efficiency Below Threshold (Bank 1) - P242F
Diesel Particulate Filter Restriction - Ash Accumulation - P2454
Diesel Particulate Filter Pressure Sensor A Circuit Low - P2455
Diesel Particulate Filter Pressure Sensor A Circuit High - P244A
Diesel Particulate Filter Differential Pressure Too Low - P244B
Diesel Particulate Filter Differential Pressure Too High
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does P2459 mean?
P2459 means "Diesel Particulate Filter Regeneration Frequency". The DPF is regenerating more often than it should.
Can I drive with code P2459?
It depends on what the vehicle is doing. Green: Set after a stretch of short trips. Yellow: Regens keep happening. Diagnose the soot source soon. Red: Derate or overheating exhaust. Stop driving.
What causes P2459?
The most common causes are: upstream soot problem: injector, EGR, boost leak; faulty DPF pressure sensor or hoses; short-trip driving.
Is P2459 a serious code?
It can be. Derate or overheating exhaust. Stop driving.
Skip the shop. We'll come to you.
Book online in about a minute, or call or text the office. We'll confirm the details and get a mechanic headed your way.