Code
C1D14
LAND ROVER
C — Chassis
Suspension ride height sensor circuit — implausible signal
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UK: 4
EN: 7
RU: 3
AI status
Completed
Completed
100%
Causes
- Damaged or corroded ride-height sensor
- Broken, shorted or open wiring between sensor and suspension control module
- Poor electrical connection at sensor connector (water ingress, corrosion)
- Sensor mechanical binding or linkage seized/detached
- Faulty suspension control module or internal CAN/processing error
- Intermittent connector contact due to movement/vibration
Symptoms
- Suspension warning lamp or message (eg. 'SERVICE AIR SUSPENSION' / 'SUSPENSION FAULT')
- Vehicle may sit unevenly or sag on one corner
- Automatic leveling or height control inoperative or limited
- Compressor may run excessively or not run when required
- Ride quality degraded; vehicle may go into limp/limited-suspension mode
- Fault may be intermittent and appear after driving over bumps or in wet conditions
What to check
- Read all stored and pending codes and freeze-frame data with JLR-capable diagnostic tool
- Check vehicle messages and whether vehicle is in limp/limited suspension mode
- Visually inspect ride-height sensor(s), mounting bracket and linkage for damage, contamination, or binding
- Inspect connectors and wiring for corrosion, broken wires, chafing and water ingress (pay attention at lower-arm routing points)
- With ignition on, backprobe sensor connector: verify reference supply voltage and ground presence
- Measure sensor output voltage or resistance while moving suspension by hand (compare smooth change vs expected range)
Signal parameters
- Reference supply: typically a 5 V reference (verify with vehicle-specific documentation)
- Expected sensor output (typical): ~0.5–4.5 V depending on travel; at normal ride height often mid-range (~2.0–3.0 V) — should change smoothly with suspension movement
- Resistance-type sensors: smooth variable resistance across travel (consult vehicle data for exact Ohms range)
- Signal should not be constant, jumping, open (OL) or pegged at supply/ground
- Response to manual wheel movement: gradual monotonic change, no intermittent drops to 0 V or to supply
Diagnostic algorithm
- Capture codes and freeze-frame data. Note which corner(s) are affected and whether code is permanent or intermittent.
- Attempt a suspension sensor self-test/relearn with the diagnostic tool. Record live sensor values while performing test. If relearn fails, continue diagnostics.
- Visually inspect the affected sensor(s), linkage and wiring for damage, corrosion, pin push-back or water entry. Repair obvious issues.
- With ignition on and engine off, measure sensor reference voltage and ground at the sensor connector. Confirm stable 5 V (or vehicle-specified) reference and good ground.
- Measure sensor output while moving the suspension by hand and watch live data. Confirm smooth, continuous change in voltage/resistance. If signal is noisy, erratic or absent, suspect sensor or wiring.
- Perform a wiggle test on harness/connectors while watching live data to find intermittent wiring faults.
- Check continuity of the signal, supply and ground conductors between sensor and suspension control module; check for short to battery or ground.
- If wiring and connectors are good but sensor output is out of range or implausible, replace the ride-height sensor and retest.
- After repair or replacement, clear codes and perform required sensor relearn/calibration per factory procedure. Road test to confirm normal operation.
- If fault persists after replacing sensor and repairing wiring, consider control module fault or CAN communication issue — check for related network codes and consult vehicle-specific diagnostics or dealer support.
Likely causes
- Wiring abrasion causing intermittent short to ground or battery
- Corroded connector at the ride-height sensor (common on lower control arms)
- Sensor potentiometer worn or contaminated preventing smooth voltage change
- Sensor linkage seized or jammed so output does not change with suspension travel
Fault status
Status
Suspension ride height sensor circuit — implausible signal. May display 'Service Air Suspension' or 'Suspension Fault'.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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