P2002 on Volkswagen
Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
P2002 on Volkswagen vehicles indicates diesel particulate filter efficiency below threshold (bank 1). Au7o has documented this code across 6 Volkswagen models — most commonly on Arteon, Caddy, Passat. 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. Typical repair costs on Volkswagen range from $100 to $3,000, depending on the specific model and root cause.
Common Causes of P2002
- •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
P2002 on Volkswagen by Model
Volkswagen Arteon(1 issue)
- EA888 Direct-Injection Carbon Buildup on Intake Valves2019-2023
The 2.0 TSI EA888 Gen3 uses direct injection, so fuel never washes the backs of the intake valves. Carbon deposits accumulate on the valves and intake-manifold runner flaps over time, restricting airflow and causing rough idle, misfires, hesitation, reduced power, and worse fuel economy. Deposits typically become noticeable around 45,000+ miles (70,000+ km).
Volkswagen Caddy(1 issue)
- DPF blockage from short-journey/urban use2007-2020
Caddy diesels used mainly for short urban trips cannot complete diesel particulate filter (DPF) regeneration, because the exhaust never gets hot enough for long enough. Soot accumulates, active regen attempts fail mid-cycle, and the DPF eventually clogs — triggering the DPF warning light, limp mode and (over time) oil dilution from post-injection fuel. This affects all DPF-equipped Caddy TDIs and is a frequent complaint from tradespeople doing stop-start delivery work.
Volkswagen Passat(1 issue)
- DPF Clogging (TDI Diesel)2012-2015
The diesel particulate filter (DPF) in TDI Passat models is prone to clogging, particularly in vehicles used primarily for short trips or city driving where the exhaust does not get hot enough for passive regeneration. A clogged DPF triggers regeneration cycles that increase fuel consumption and can eventually put the vehicle in limp mode if the filter becomes too saturated with soot.
Volkswagen Scirocco(1 issue)
- 2.0 TDI diesel particulate filter (DPF) and EGR clogging2008-2017
The 2.0 TDI's diesel particulate filter blocks up on cars used mainly for short, low-speed urban journeys, because the engine never reaches the sustained temperatures needed for passive/active regeneration. A clogged DPF (often combined with a sooty or sticking EGR valve) triggers the exhaust/glow-plug warning lamp, reduced power, limp mode, heavy smoke and more frequent forced regenerations. Reports note this worsened on some cars after the dieselgate NOx emissions software update, which increased regeneration frequency, rough idle and DPF warnings.
Volkswagen T-Roc(1 issue)
- TDI diesel DPF clogging / EGR contamination on short journeys2018-2022
T-Roc TDI diesels (1.6 TDI and 2.0 TDI, EA288) used predominantly for short, low-speed trips suffer incomplete DPF (diesel particulate filter) regeneration, leading to soot build-up, the DPF warning light, reduced power/limp mode and increased fuel use. A sticking or carbon-fouled EGR valve worsens soot loading and accelerates filter clogging. AdBlue/SCR sensor or software faults are also reported (warning light failing to clear after a refill). Some 2.0 TDI 4Motion owners report unusually frequent regeneration cycles (every ~120–130 miles).
Volkswagen Touareg(1 issue)
- DPF Clogging and EGR-Induced Limp Mode (diesel)2007-2018
Diesel Touaregs used mostly for short, low-speed trips suffer diesel particulate filter (DPF) soot accumulation because the engine rarely reaches the temperature needed for passive regeneration. Compounding this, EGR faults (sticking/clogged EGR valve, failed differential pressure or exhaust temperature sensors) prevent the regeneration cycle from completing. The result is rising backpressure, increased fuel consumption, loss of power, DPF warning light, and eventually limp mode. Owners report that once one satellite sensor in the regen chain fails, regeneration stops entirely and the DPF clogs.
Looking for P2002 on a different make?
View P2002 across all makes →Frequently Asked Questions
What does P2002 mean on Volkswagen?▼
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 Volkswagen specifically, this code is documented across 6 models.
What causes P2002 on Volkswagen vehicles?▼
Common causes on Volkswagen: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P2002 on a Volkswagen?▼
Repair costs on Volkswagen range from $100 to $3,000, depending on the specific model and root cause.
Which Volkswagen models have P2002 documented?▼
Au7o has documented P2002 on 6 Volkswagen models: Arteon, Caddy, Passat, Scirocco, T-Roc, Touareg.