P172A: Auxiliary Transmission Fluid Pump Reverse Rotation
2 vehicles · 2 makes · $1,200-$4,500 repair
Most Reported On
P172A is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2008-2020 Skoda Octavia, and 2011-2016 Audi A1 (S tronic), with repair costs ranging from $1,200 to $4,500.
Common Causes
Typical Repair Cost
Based on 2 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P172A, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does P172A mean?
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.
What are the most common causes of P172A?
The most common causes of P172A are: 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. The specific cause varies by vehicle.
How much does it cost to fix P172A?
Repair costs for P172A range from $1,200 to $4,500, depending on the vehicle and root cause.
Which vehicles are affected by P172A?
Au7o has documented P172A across 2 vehicle models from 2 manufacturers: Audi, Skoda.
Sources (6)
- ForumMechatronics failure - DSG - Skoda Octavia Mk3 - BRISKODA
- articleSkoda Kodiaq, Octavia, Superb Common Gearbox Problems - ASR Gearbox Repairs
- articleSkoda Octavia (2013-2020) Review - Honest John
- articleVW / Audi 0AM DQ200 Mechatronic Failures - Symptoms & Fault Codes - Eco Torque
- articleDSG 7 DQ200 0AM automatic gearbox recall 2019
- article9 Common Issues With The Audi A1 (transmission section) - Volksmaster
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.