P2002 on Citroen: How to Diagnose & Fix
Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
3 Citroen models · 3 documented issues · 3 critical · $300-$2,500 repair
P2002 on Citroen by model: symptoms, diagnosis and fix
The C4 diesel models suffer from the common PSA DPF regeneration problems, with the additive-based system requiring regular Eolys fluid top-ups. Short journey use prevents passive regeneration from completing.
Common Symptoms
- DPF warning light
- Engine limp mode
- Power loss
- Increased fuel consumption
How to Fix
Top up Eolys additive, force DPF regeneration via diagnostic tool, and advise regular motorway driving. Severely blocked filters require professional cleaning or replacement.
The Berlingo diesel DPF blocks prematurely when used for short urban journeys and commercial delivery work. The van duty cycle of frequent stops and starts prevents the DPF from reaching regeneration temperature.
Common Symptoms
- DPF warning light
- Loss of power
- Limp mode
- Excessive soot from exhaust
How to Fix
Schedule regular forced regenerations as part of fleet maintenance. Ensure Eolys additive is maintained. Plan daily route to include sustained higher-speed running.
The C5 Aircross BlueHDi engines experience DPF regeneration failures in urban driving conditions. The larger SUV body and heavier weight mean the engine works harder yet rarely reaches optimal regeneration temperatures in city traffic.
Common Symptoms
- DPF warning light
- Reduced power
- Limp mode
- Failed regen attempts
How to Fix
Force DPF regeneration via diagnostic tool. Ensure the Eolys additive is topped up at each service. Incorporate regular sustained motorway driving into the vehicle usage pattern.
P2002 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P2002 mean on a Citroen?
P2002 stands for "Diesel Particulate Filter Efficiency Below Threshold (Bank 1)." P2002 indicates that the diesel particulate filter (DPF) on bank 1 is performing below its required efficiency threshold. The DPF captures and stores soot from diesel exhaust and periodically burns it off (regeneration); the engine computer monitors exhaust pressure across the filter and other data to judge how well it's trapping and clearing soot. When that efficiency falls too low, this code sets. Symptoms can include reduced power, a clogged-filter warning, frequent or failed regenerations, and increased emissions. On Citroen it is documented across 3 models: C4, Berlingo, C5 Aircross.
What are the most common causes of P2002?
The most common causes of P2002 are: Clogged or damaged diesel particulate filter, Failed or incomplete DPF regeneration (mostly short trips), Faulty differential (DPF) pressure sensor or hoses, Faulty exhaust temperature sensor(s), Exhaust leak before or across the DPF, Engine running issues causing excess soot (injectors, EGR, turbo), Use of incorrect (non-low-ash) engine oil or fuel quality issues. The specific cause varies by vehicle.
How much does it cost to fix P2002 on a Citroen?
Published repair estimates on Citroen range from $300 to $2,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P2002 on a different make?
View P2002 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.