P189C: Diesel Particulate Filter Restriction - Forced Limited Power
11 vehicles · 5 makes · $200-$5,000 repair
Most Reported On
P189C is an OBD-II diagnostic trouble code meaning “Diesel Particulate Filter Restriction - Forced Limited Power.” The diesel particulate filter is excessively restricted, triggering forced power reduction. Common on diesel trucks. This code is most commonly reported on 2008-2021 Volkswagen Golf, 2012-2019 Volkswagen Passat, and 2008-2019 Volkswagen Jetta, plus 8 other vehicles, with repair costs ranging from $200 to $5,000.
Common Causes
Typical Repair Cost
Based on 11 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P189C, 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
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (11)
DSG (DQ250/DQ381) Mechatronic Unit and Clutch Pack Failure
DSG Transmission Shudder and Rough Shifting
DSG Mechatronic Unit Failure
DSG (DQ250) Transmission Failure and Mechatronic Unit Issues
7-Speed DSG (DQ381) Shudder and Rough Low-Speed Shifting
DSG Mechatronic Unit Failure
DSG Mechatronic Unit Failure
FAQ
What does P189C mean?
P189C stands for "Diesel Particulate Filter Restriction - Forced Limited Power." The diesel particulate filter is excessively restricted, triggering forced power reduction. Common on diesel trucks.
What are the most common causes of P189C?
The most common causes of P189C are: Excessive soot accumulation, Failed DPF regeneration, Faulty DPF pressure sensor, EGR system malfunction, Frequent short trips preventing regen. The specific cause varies by vehicle.
How much does it cost to fix P189C?
Repair costs for P189C range from $200 to $5,000, depending on the vehicle and root cause.
Which vehicles are affected by P189C?
Au7o has documented P189C across 11 vehicle models from 5 manufacturers: Audi, CUPRA, SEAT, Toyota, Volkswagen.
Sources (5)
- TSBVolkswagen TSB 2018423 - DQ250 Mechatronic Unit Replacement Procedure
- ForumReddit r/Volkswagen Thread Discussing DSG Mechatronic Unit Failure on Jetta
- videoAudi TT DSG Transmission Mechatronic Unit Replacement - ChrisFix
- ForumReddit r/Volkswagen discussion on DSG Mechatronic Unit Failure on Tiguan
- ForumReddit r/Volkswagen discussion on DSG Mechatronic Unit Failure on GTI
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.