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Home / DTC / B143E — Air suspension compressor status signal with

B143E — Air suspension compressor status signal with

Detailed page for trouble code B143E.

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Code

B143E

LAND ROVER B — Body

Air suspension compressor status signal with

Brand: LAND ROVER
Type: B — Body
Views: UK: 2 EN: 7 RU: 3
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Page language: EN

Causes

  • Open or shorted wiring in compressor status circuit
  • Corroded or loose connector at compressor or control module
  • Failed air suspension compressor or internal sensor
  • Faulty air suspension control module (ASCM) or body control module (BCM) input
  • Blown fuse or faulty relay supplying the compressor
  • Low battery/insufficient supply voltage or poor ground

Symptoms

  • Air suspension warning lamp or dash message
  • Compressor does not run when system requests it
  • Vehicle will not reach or hold correct ride height; sagging or uneven ride height
  • Longer-than-normal run time for leveling or repeated compressor operation
  • Audible clicking/relay noise or abnormal compressor sounds
  • Intermittent operation or fault present after vibration/temp changes

What to check

  • Scan vehicle for related and pending DTCs; record freeze frame and live data
  • Visually inspect compressor, connectors and harness for damage, corrosion or water ingress
  • Check fuses and relays for the air suspension compressor circuit
  • Attempt to command compressor on/off with a diagnostic tool and observe behavior
  • Measure voltage and ground at the compressor power and status pins with key on and while commanding compressor
  • Check continuity between compressor status pin and the ASCM connector; inspect for high resistance or open circuit

Signal parameters

  • Typical signal types: switched 12 V or switched ground; some systems use a pulsed (PWM) status line
  • Expected inactive level: ~0 V (ground) or open circuit, depending on design
  • Expected active level: ~11–14 V (battery voltage) when commanded on; if PWM, duty cycle varies 0–100%
  • Oscilloscope may show pulsed current draw when compressor is modulated; frequency depends on model (variable)
  • Typical DC continuity: low resistance between compressor power pin and relay output when relay energized (few ohms for motor feed)

Diagnostic algorithm

  1. Use a scan tool to read and record all related codes, live data and the compressor command/status PID. Attempt to reproduce the fault.
  2. Visually inspect compressor, connectors, wiring harness and ground straps for corrosion, looseness, or damage. Repair as necessary.
  3. Verify fuses and relays for the air suspension compressor; replace suspect items.
  4. With ignition ON, measure voltage at the compressor power terminal and status terminal while commanding compressor ON via diagnostic tool. Compare to expected levels.
  5. Check continuity/resistance of the status/signal wire back to the ASCM connector. Repair open/high-resistance circuits.
  6. Use an oscilloscope to confirm the status waveform if the system uses PWM or to detect intermittent signals.
  7. If power/ground and signal wiring are good but the compressor does not report status, bench-test or replace the compressor (or internal status sensor) as per manufacturer procedure.
  8. If wiring and compressor test good, evaluate ASCM/BCM input circuitry and reflash/reprogram module if recommended. Replace control module only after confirming external components are good.
  9. Clear codes and road-test to confirm repair. Monitor for reappearance of B143E and related codes.

Likely causes

  • Damaged status/signal wire (pinched, chafed, fractured)
  • Corroded connector at compressor or module causing intermittent contact
  • Compressor motor seized or failing so no status feedback
  • Internal compressor status switch/sensor failure
  • Faulty relay or open fuse in compressor feed circuit
  • Poor battery condition or weak charging system causing voltage dropout

Fault status

⚠️ Status
Air suspension compressor status signal — circuit fault or implausible/absent signal detected by control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

B143A B143B B143C B143D B1440
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