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Home / DTC / B1143 — Ignition status 2

B1143 — Ignition status 2

Detailed page for trouble code B1143.

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Code

B1143

LAND ROVER B — Body

Ignition status 2

Brand: LAND ROVER
Type: B — Body
Views: UK: 5 EN: 16 RU: 10
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Page language: EN

Causes

  • Faulty or worn ignition switch
  • Damaged wiring or poor connector connection between ignition switch and control modules
  • Corroded terminal(s) or poor ground
  • Low or unstable battery/charging system voltage
  • Faulty body control module (BCM) or other control module interpreting the ignition signal
  • Aftermarket alarm, immobiliser or remote start interfering with ignition circuit

Symptoms

  • No-crank or intermittent-start condition
  • Accessories not operating correctly in certain key positions
  • Warning lights or stored/active fault indicator related to vehicle electronics
  • Unexpected engine shut-down or loss of electrical functions
  • Difficulty reprogramming keys or immobiliser-related starting issues

What to check

  • Read and record all related fault codes and freeze-frame data with a capable scan tool; note ignition state when code set
  • Check battery state of charge and charging system voltage (resting ~12.6 V, running 13.5–14.5 V)
  • Visually inspect ignition switch, associated connectors and wiring for damage, corrosion or loose terminals
  • Back-probe ignition switch terminals and measure voltage in each key position (OFF/ACC/ON/START)
  • Check continuity and resistance between ignition switch pins and the receiving module(s)
  • Inspect grounds near dash, steering column and fuse/relay centers for tightness and corrosion

Signal parameters

  • Ignition OFF: ~0 V on switched circuits (or low/ground referenced logical state)
  • Ignition ACC: battery voltage present (~11–13 V) on ACC feed
  • Ignition ON/RUN: battery voltage present (~12–14 V) on RUN feed
  • Ignition START: momentary START feed (battery voltage) during cranking; engine cranking may drop system voltage briefly
  • Digital ignition status may be communicated over vehicle network (CAN) — expected valid messages without timeout or error

Diagnostic algorithm

  1. Connect scan tool, read codes and live data. Note when B1143 appears and the reported ignition state.
  2. Verify battery health and system voltage. Recharge or replace battery if below specification before further testing.
  3. Reproduce the fault by cycling key positions while monitoring voltage at the ignition switch and at the module input. Back-probe connectors; look for intermittent or missing voltage in the affected position.
  4. Inspect and wiggle harnesses and connectors (ignition switch, steering column, fuse/relay box, BCM) while watching live data for intermittent changes.
  5. Check continuity/resistance of ignition switch outputs to the receiving module(s). Repair any open/short circuits or high-resistance connections.
  6. Remove and inspect the ignition switch connector for corrosion or bent pins; clean or repair as needed.
  7. If aftermarket devices present, temporarily disconnect them and retest to exclude interference.
  8. Check relevant module grounds and harness grounds; clean and tighten as necessary.
  9. If wiring and switch test good but fault persists, check CAN/network communication and module input pins for expected logical signals. Reflash/update module software if manufacturer service information advises.
  10. Replace the ignition switch if internal intermittent or mechanical failure is confirmed. Perform any required key re-learn/immobiliser programming after replacement.
  11. If replacement switch does not clear the issue, consider module testing/replacement as a last step, following manufacturer diagnostics and programming procedures.
  12. Safety note: isolate battery when doing major wiring repairs and follow anti-theft/key programming procedures to avoid immobiliser lockout.

Likely causes

  • Open or short in the ignition switch harness or connector
  • Intermittent contact inside the ignition switch (mechanical wear)
  • Loose or corroded connector at the BCM or fuse/relay box
  • Low battery voltage causing spurious signal readings
  • Recent installation of aftermarket electronics altering the ignition signal path

Fault status

⚠️ Status
Control module detected an invalid or inconsistent ignition status (Ignition status 2). The ignition position signal is missing, intermittent or outside expected parameters, requiring inspection of the ignition switch circuit, wiring, battery/ground condition and related modules.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1140 B1141 B1142 B1144 P0562 U0100
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