P1889 on Land Rover
Transmission Adaptive Pressure Performance
P1889 on Land Rover vehicles indicates transmission adaptive pressure performance. Au7o has documented this code across 2 Land Rover models — most commonly on Discovery, Range Rover Sport. 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. Typical repair costs on Land Rover range from $300 to $4,500, depending on the specific model and root cause.
Common Causes of P1889
- •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
P1889 on Land Rover by Model
Land Rover Discovery(1 issue)
- Terrain Response System Faults and Mode Selection Failure2005-2016
The Terrain Response system on the LR3/LR4 develops faults where mode selection fails or the system defaults to General mode only. The rotary selector switch wears out internally, and the shift motor on the transfer case can fail. Corroded connectors at the transfer case are a common root cause. The vehicle remains drivable in General mode but loses off-road capability.
Land Rover Range Rover Sport(1 issue)
- Transfer Case Actuator Motor and Chain Failure2005-2013
The BorgWarner transfer case on the L320 Range Rover Sport suffers from actuator motor failures that prevent the vehicle from shifting between high and low range. The transfer case chain also stretches over time, causing a whining or grinding noise. In severe cases, the chain can skip, damaging the internal gears and requiring a complete transfer case rebuild.
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View P1889 across all makes →Frequently Asked Questions
What does P1889 mean on Land Rover?▼
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. On Land Rover specifically, this code is documented across 2 models.
What causes P1889 on Land Rover vehicles?▼
Common causes on Land Rover: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1889 on a Land Rover?▼
Repair costs on Land Rover range from $300 to $4,500, depending on the specific model and root cause.
Which Land Rover models have P1889 documented?▼
Au7o has documented P1889 on 2 Land Rover models: Discovery, Range Rover Sport.