P179C on Audi
Diesel Particulate Filter Restriction - Ash Accumulation
P179C on Audi vehicles indicates diesel particulate filter restriction - ash accumulation. Au7o has documented this code across 1 Audi model — most commonly on SQ2. The DPF has excessive ash buildup that cannot be removed by regeneration. Ash is a byproduct of oil consumption and accumulates over time. Typical repair costs on Audi range from $300 to $3,500, depending on the specific model and root cause.
Common Causes of P179C
- •Normal ash accumulation over high mileage
- •Excessive oil consumption
- •Wrong oil specification
- •DPF approaching end of service life
- •Failed regeneration cycles
P179C on Audi by Model
Audi SQ2(1 issue)
- S tronic (DQ381) 7-speed wet-clutch transmission: jerky low-speed shifts, hesitation and limp mode2019-2024
The SQ2's 7-speed S tronic dual-clutch (the wet-clutch DQ381 / 0GC unit shared across MQB-platform A3/Q3/TT and VW Golf GTI/R) is generally durable but is widely reported to develop jerky or hesitant engagement at low speed and in stop-start traffic, harsh shifts when hot, and occasional limp-mode events. Owners describe a jolt/shunt when pulling away or in 1-2 / 2-1 changes. Root causes traced in the field include mechatronic valve/solenoid faults, clutch position-sensor faults, K1 clutch-pack wear, and degraded/contaminated gearbox fluid, especially where the DSG oil service has been skipped.
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View P179C across all makes →Frequently Asked Questions
What does P179C mean on Audi?▼
P179C stands for "Diesel Particulate Filter Restriction - Ash Accumulation." The DPF has excessive ash buildup that cannot be removed by regeneration. Ash is a byproduct of oil consumption and accumulates over time. On Audi specifically, this code is documented across 1 model.
What causes P179C on Audi vehicles?▼
Common causes on Audi: Normal ash accumulation over high mileage, Excessive oil consumption, Wrong oil specification, DPF approaching end of service life, Failed regeneration cycles. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P179C on a Audi?▼
Repair costs on Audi range from $300 to $3,500, depending on the specific model and root cause.
Which Audi models have P179C documented?▼
Au7o has documented P179C on 1 Audi model: SQ2.