U0140 on Land Rover: How to Diagnose & Fix
Lost Communication with BCM
1 Land Rover model · 1 documented issue · $200-$2,500 repair
U0140 on Land Rover by model: symptoms, diagnosis and fix
Owners of the redesigned Range Rover Sport have reported water leaks into the cargo area and rear body sections, often after rain or washing. The leak path is commonly suspected around tailgate seals, rear lamp/body interfaces, roof or upper tailgate trim areas, and can lead to damp carpeting, condensation, musty odor, or intermittent electrical faults in rear-mounted modules. Because several control units and connectors are located in the rear of the vehicle, prolonged moisture exposure can become expensive if not addressed early.
Common Symptoms
- Wet cargo floor or side trim
- Condensation inside rear glass or lamps
- Musty smell in cabin
- Intermittent rear electrical faults
- Water visible after rain or car wash
How to Fix
Diagnosis requires removing rear trim panels, performing a controlled water test, and checking tailgate weatherstrips, body seam sealing, lamp seals, and harness grommets. Repairs may include resealing body joints, replacing distorted seals, adjusting tailgate alignment, and drying/cleaning affected connectors or modules. If corrosion has started, damaged connectors or control units may need replacement.
U0140 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does U0140 mean on a Land Rover?
U0140 stands for "Lost Communication with BCM." U0140 is a network communication code meaning a module has lost communication with the body control module (BCM) over the vehicle's data bus. The BCM oversees many body and convenience functions — lighting, door locks, windows, wipers, anti-theft, and gateway communications — so losing contact with it can cause a wide range of seemingly unrelated electrical problems and warning lights. This is typically a wiring, connector, power/ground, or bus fault, or a failure of the BCM itself. Because the BCM often acts as a communication hub, this code can appear alongside other 'lost communication' codes. On Land Rover it is documented across 1 model: Range Rover Sport.
What are the most common causes of U0140?
The most common causes of U0140 are: Loss of power or ground to the BCM, CAN/data bus wiring damage, short, or open circuit, Corroded, loose, or damaged BCM connectors, Blown fuse feeding the BCM, Failed body control module, Water intrusion or corrosion in the harness, Another module faulting the shared data bus. The specific cause varies by vehicle.
How much does it cost to fix U0140 on a Land Rover?
Published repair estimates on Land Rover range from $200 to $2,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for U0140 on a different make?
View U0140 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.