B12D1

Code

LAND ROVER B — Body

Dynamic air pressure damping motor

Brand: LAND ROVER

Type: B — Body

Views: UK: 18 EN: 88 RU: 23

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Page language: EN

Causes

Open or short in motor supply or ground wiring
Corroded/poor connector or pin contact at the motor
Failed dynamic air pressure damping motor (mechanical or electrical)
Blown fuse or relay for suspension/air system circuit
Faulty suspension control module or software fault
Restricted or mechanically seized valve or actuator within the motor assembly

Symptoms

Suspension warning lamp or message displayed (e.g., suspension fault or service required)
Reduced damping control or fixed ride height behaviour
Harsh or soft ride, vehicle leans or sag on one corner
Unusual noise from wheelhouse or near damping motor when system attempts to operate
Inability to perform height adjustments or automatic leveling

What to check

Read and record all stored codes and freeze/frame data with a factory-level scan tool
Visually inspect wiring harness and connector at the damping motor for corrosion, damage, water ingress or loose pins
Check related fuses and relays for the air suspension/pressure control circuits
With ignition on, check for battery voltage at the motor supply terminal and a good ground
Request the actuator using a diagnostic tool to observe command and response
Listen for motor operation and feel for pressure/valve movement when commanded

Signal parameters

Supply voltage to motor: near battery voltage with ignition on when not switched (approx. 11–14 V expected)
Control signal: often a switched supply or PWM command from suspension module (duty cycle varies with command)
Motor coil resistance: typically low (single-digit ohms) — expected to be low-ohm; a high/infinite reading indicates open winding
Current draw: motor operation will draw measurable current (can be up to several amps) — an open or short abnormal
When commanded, system should show change in pressure or damping state in live data

Diagnostic algorithm

Retrieve all related DTCs and live data with an OEM-level scan tool. Note freeze-frame data and any correlated codes.
Attempt to reproduce the fault by cycling suspension modes and observing live parameters, actuator status and fault set conditions.
Perform visual inspection at the motor connector and harness for corrosion, damage or water intrusion. Repair as necessary.
Verify fuses/relays for the suspension/air system circuits; replace if blown and check for reoccurrence.
With connector disconnected, measure supply voltage and ground at the motor harness. If no supply/ground present, trace back to fuse/relay/module.
Measure motor coil resistance (with battery disconnected). An open or very high resistance indicates a failed motor winding.
Command the motor/actuator ON via diagnostic tool while monitoring voltage and current. If motor does not run but receives proper command/supply, likely motor fault.
If motor runs but system performance is poor, check for mechanical binding or valve blockage and inspect pneumatic lines for leaks.
If wiring and motor check good but fault persists, check the suspension control module outputs and grounds; reflash or replace module if confirmed faulty per OEM procedures.
Clear codes and road-test to verify repair. Re-scan to ensure no further related faults are stored.

Likely causes

Damaged wiring or poor connector at the damping motor (most common)
Motor windings or internal gearbox failure
Loss of supply or ground (fuse/relay or harness damage)
Control module output/RF command failure

Fault status

⚠️ Status

Dynamic air pressure damping motor — electrical/functional fault (check motor, wiring and control module)

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-3.0 hours

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