P2002 on Chevrolet: How to Diagnose & Fix
Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
1 Chevrolet model · 1 documented issue · 1 critical · $400-$3,000 repair
P2002 on Chevrolet by model: symptoms, diagnosis and fix
Cruze diesels driven on short trips never complete an active regeneration, so soot accumulates until the DPF restriction threshold is passed and the ECM drops the car into reduced power with a 'Diesel Particulate Filter Full' / Engine Power Is Reduced message and P2463. Once loading is high the ECM will also refuse to run a service regen, sometimes blocking it with an overtemperature-protection condition, which traps owners in a loop where neither driving nor the scan tool can clear it. Repeated interrupted regens also dilute engine oil with post-injected fuel.
Common Symptoms
- Diesel Particulate Filter Full message
- Engine Power Is Reduced / limp mode
- Regen never completes on short trips
- Rising oil level and fuel smell in the oil
- Loss of power and poor fuel economy
How to Fix
Catch it early: complete a highway drive cycle at sustained speed to let a passive/active regen finish before the restriction threshold is reached. If it is already in limp mode, command a service regeneration with a capable scan tool after confirming no inhibiting faults (coolant temp, exhaust temp sensors, EGR, DEF faults) - the ECM will block a manual regen while another fault is active. Heavily loaded or ash-saturated filters require removal and off-car thermal/aqueous cleaning, or DPF replacement. Change the engine oil after repeated failed regens because of fuel dilution, and fix any exhaust temperature sensor or EGR fault that keeps aborting the cycle.
Sources for this issue (3)
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 Chevrolet?
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 Chevrolet it is documented across 1 model: Cruze.
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 Chevrolet?
Published repair estimates on Chevrolet range from $400 to $3,000 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.