P2002 on GMC
Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
P2002 on GMC vehicles indicates diesel particulate filter efficiency below threshold (bank 1). Au7o has documented this code across 1 GMC model — most commonly on Sierra 3500HD. 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 GMC range from $300 to $3,500, 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 GMC by Model
GMC Sierra 3500HD(1 issue)
- DPF (Diesel Particulate Filter) Clogging and Regeneration Failure2011-2022
The Duramax diesel DPF becomes clogged with soot under low-speed, short-trip, or heavy towing duty cycles that prevent complete passive regeneration. Owners report the truck entering limp mode, reduced power, and repeated active regen cycles that fail to fully clean the filter. GM TSB 14-06-04-003 addresses regen strategy calibration updates for LML and L5P engines.
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View P2002 across all makes →Frequently Asked Questions
What does P2002 mean on GMC?▼
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 GMC specifically, this code is documented across 1 model.
What causes P2002 on GMC vehicles?▼
Common causes on GMC: 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 GMC?▼
Repair costs on GMC range from $300 to $3,500, depending on the specific model and root cause.
Which GMC models have P2002 documented?▼
Au7o has documented P2002 on 1 GMC model: Sierra 3500HD.