How the suspension system is evaluated
Air springs, reservoirs, valve blocks, compressors, height sensors and electronic controls work together, but the fitted hardware varies by chassis and options. A vehicle that sinks after parking may have an air leak; a vehicle that cannot rise may instead have a supply, venting, control or sensor problem. Record corner heights after shutdown and at repeat intervals. Read chassis faults and compare actual height readings with commands. Check for leakage and compressor overheating before replacing major components.
Manufacturer-specific considerations
Land Rover bulletin LTB00793NAS2 documents C1A13-64 on certain 2014–2016 vehicles where the suspension supply unit cannot vent because of an exhaust valve or silencer issue. LTB00604NAS5 describes a different front air-spring/damper hydraulic leak on certain Range Rover and Range Rover Sport vehicles. Neither bulletin should be applied without VIN and equipment checks.
Repair confirmation
After repair, verify commanded raise/lower operation, stable parked height and any required calibration. Never work beneath an air-suspended vehicle without proper support.
The source research addresses Range Rover applications described as 2013–2021 (Range Rover L405). The correct testing depends on the exact year, engine, drivetrain and equipment.
Symptoms an owner may notice
Suspension-fault/stop-engine message with intermittent ATCM supply dropping to zero.
Asked whether an air-suspension shutoff is required before lifting the vehicle.
After compressor replacement, the passenger-side air suspension would not raise and the vehicle sat at different heights.
Suspension warning with CAN, battery-voltage and hydraulic-pressure faults.
Codes documented in the research include U0001-81, U3003-62, C1119-09, C1A34-72. A code indicates a monitored condition and is not proof that one particular component failed.
What diagnosis involves
The available case notes describe checks such as Monitor ATCM power supply; Observe ride-height sensor values while raising vehicle on hoist. The actual vehicle must be evaluated before any repair recommendation.
Findings recorded in the cases included Dropped randomly to zero; Values changed. These observations may guide testing but cannot be assumed on another vehicle.
Documented causes and repair decisions
In the researched cases, identified causes included Failed dynamic response valve block. A different vehicle with the same symptoms may have a different underlying problem.
Reported successful repairs in the research included Replace dynamic valve block and recalibrate suspension. These are external case outcomes, not claims that Mich’s performed those specific repairs.
Some attempted repairs were ineffective or temporary, including Attempt ride-height calibration — unsuccessful. That is one reason to verify the failure before replacing components.
If your Range Rover has a similar symptom, contact Mich’s Foreign Cars in Hickory, NC at 828-324-6012. Share the model year, engine, exact warning messages and the conditions when the problem occurs.