P172A on Audi
Auxiliary Transmission Fluid Pump Reverse Rotation
P172A on Audi vehicles indicates auxiliary transmission fluid pump reverse rotation. Au7o has documented this code across 1 Audi model — most commonly on A1. P172A is a manufacturer-specific powertrain code (most commonly seen on Subaru CVT-equipped vehicles) indicating that the auxiliary (electric) transmission fluid pump is rotating in reverse. The auxiliary pump maintains transmission/CVT fluid pressure, so reversed rotation reduces hydraulic pressure and can cause shifting and engagement problems. The transmission control module sets this code when it detects the pump is not turning in the commanded direction. Typical repair costs on Audi range from $1,200 to $2,800, depending on the specific model and root cause.
Common Causes of P172A
- •Faulty auxiliary (electric) transmission fluid pump or its motor
- •Leaking O-ring on the electric oil pump relief valve allowing CVT fluid into the pump motor
- •Damaged, corroded, or shorted wiring/connectors to the auxiliary pump
- •Faulty pump control module or transmission control module (TCM)
- •Low or degraded transmission/CVT fluid
P172A on Audi by Model
Audi A1(1 issue)
- 7-Speed S tronic (DQ200 / 0AM) Dual-Clutch Mechatronic Failure2011-2016
A1s fitted with the 7-speed dry-clutch S tronic (DQ200, VAG code 0AM) automatic suffer mechatronic (valve body / hydraulic control unit) failures. A design flaw in the valve body's accumulator/canister wall can crack and lose high hydraulic pressure, while the dry clutch packs wear and cause juddering. This led to a VAG recall covering A1s built roughly 2011-2016 (part of a wider ~80,000-vehicle UK action). Failure can cause sudden, complete loss of drive.
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View P172A across all makes →Frequently Asked Questions
What does P172A mean on Audi?▼
P172A stands for "Auxiliary Transmission Fluid Pump Reverse Rotation." P172A is a manufacturer-specific powertrain code (most commonly seen on Subaru CVT-equipped vehicles) indicating that the auxiliary (electric) transmission fluid pump is rotating in reverse. The auxiliary pump maintains transmission/CVT fluid pressure, so reversed rotation reduces hydraulic pressure and can cause shifting and engagement problems. The transmission control module sets this code when it detects the pump is not turning in the commanded direction. On Audi specifically, this code is documented across 1 model.
What causes P172A on Audi vehicles?▼
Common causes on Audi: Faulty auxiliary (electric) transmission fluid pump or its motor, Leaking O-ring on the electric oil pump relief valve allowing CVT fluid into the pump motor, Damaged, corroded, or shorted wiring/connectors to the auxiliary pump, Faulty pump control module or transmission control module (TCM), Low or degraded transmission/CVT fluid. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P172A on a Audi?▼
Repair costs on Audi range from $1,200 to $2,800, depending on the specific model and root cause.
Which Audi models have P172A documented?▼
Au7o has documented P172A on 1 Audi model: A1.