P1889: Transmission Adaptive Pressure Performance
5 vehicles · 4 makes · $200-$4,500 repair
Most Reported On
P1889 is an OBD-II diagnostic trouble code meaning “Transmission Adaptive Pressure Performance.” This is a manufacturer-specific code tied to adaptive pressure control performance in the drivetrain, where a control module monitors a pressure-regulating system and the adaptive values it learns over time. The module compares actual pressure against what it commanded and sets this code when performance stays outside the expected range despite the system trying to adapt. Depending on the make and platform it can relate to automatic transmission line pressure or, on some Ford/Volvo-family AWD vehicles, the all-wheel-drive coupling oil pump and its pressure sensor. Because the exact meaning varies by manufacturer, the affected system should be confirmed with make-specific service information before repairs. This code is most commonly reported on 2005-2016 Land Rover Discovery, 2005-2013 Land Rover Range Rover Sport, and 2011-2025 MINI Countryman, plus 2 other vehicles, with repair costs ranging from $200 to $4,500.
Common Causes
Typical Repair Cost
Based on 5 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P1889, 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 (5)
FAQ
What does P1889 mean?
P1889 stands for "Transmission Adaptive Pressure Performance." This is a manufacturer-specific code tied to adaptive pressure control performance in the drivetrain, where a control module monitors a pressure-regulating system and the adaptive values it learns over time. The module compares actual pressure against what it commanded and sets this code when performance stays outside the expected range despite the system trying to adapt. Depending on the make and platform it can relate to automatic transmission line pressure or, on some Ford/Volvo-family AWD vehicles, the all-wheel-drive coupling oil pump and its pressure sensor. Because the exact meaning varies by manufacturer, the affected system should be confirmed with make-specific service information before repairs.
What are the most common causes of P1889?
The most common causes of P1889 are: Faulty pressure or temperature sensor in the affected system, Worn or weak fluid pump not building proper pressure, Low or contaminated fluid, Internal hydraulic leak or wear reducing pressure, Wiring or connector fault in the sensor/solenoid circuit, Adaptive values out of range needing a relearn, Faulty control module for the affected system. The specific cause varies by vehicle.
How much does it cost to fix P1889?
Repair costs for P1889 range from $200 to $4,500, depending on the vehicle and root cause.
Which vehicles are affected by P1889?
Au7o has documented P1889 across 5 vehicle models from 4 manufacturers: Ford, Land Rover, MINI, Mazda.
Sources (6)
- ForumRangeRovers.net: Trans Failsafe Transfer case motor? Noise on actuator signal
- ForumRangeRovers.net: Has anyone had to replaced their Transfer Case Motor?
- manufacturerKMotors: Common Problems & Fixes - Range Rover Sport L320
- manufacturerRover Parts: Land Rover EPB Fault Discovery 4 and Range Rover Sport L320
- videoYouTube - Known Channel Video Explaining Rear Differential Overheating on 2021 Bronco Sport Badlands
- ForumReddit r/MechanicAdvice Thread Discussing AWD Warning Light and Vibrations on 2007 Mazda CX-9
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.