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Home / DTC / B1142 — Ignition status 1

B1142 — Ignition status 1

Detailed page for trouble code B1142.

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Code

B1142

LAND ROVER B — Body

Ignition status 1

Brand: LAND ROVER
Type: B — Body
AI status
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Page language: EN

Causes

  • Open or short in ignition status wiring or poor connector contact
  • Faulty ignition switch or keyless ignition module
  • Blown fuse or poor power/ground to related modules
  • Low battery voltage or intermittent supply during crank
  • Faulty Body Control Module (BCM) or instrument cluster reporting incorrect status
  • CAN bus or module communication fault

Symptoms

  • Malfunction Indicator Light (MIL) or warning lamp related to body/electrical systems
  • Accessory circuitry not working in ACC or RUN positions
  • Intermittent no-crank or no-start condition
  • Multiple related module warnings or communications errors
  • Vehicle does not detect key or does not enter expected ignition state

What to check

  • Read complete fault memory and freeze-frame data with a compatible diagnostic scanner
  • Verify battery voltage at rest and during key-on/crank (good battery ≥12.4 V at rest, ≥9–10 V during crank depending on starter)
  • Inspect fuses and relays for circuits related to ignition, BCM and instrument cluster
  • Visually inspect ignition switch connector and wiring for damage, corrosion or chafing
  • Check for additional communication (CAN) DTCs that may indicate network problems
  • Confirm correct key/transponder recognition if keyless entry/immobiliser is fitted

Signal parameters

  • Ignition status signal expected to change with key positions: OFF = no ignition logic high, ACC = ignition/accessory active, RUN = ignition on, START = cranking state
  • Typical voltages at ignition feed/ACC/RUN terminals: approximately battery voltage (11–14.5 V) when active; near 0–1 V when inactive
  • During cranking expect voltage dip but system should still register START state (voltage may fall to ~8–10 V under load)
  • Ignition status often reported as a digital/CAN message (check for BCM/ICU message identifiers and valid payload)
  • Continuity/resistance: ignition switch contacts should show near 0 Ω when closed between respective terminals

Diagnostic algorithm

  1. Connect a full-function scan tool and record all stored and pending codes, module status and freeze-frame data. Note which module logged B1142.
  2. Verify battery State of Charge and conduct a load/cranking voltage test. Recharge or replace battery if voltage is low or drops excessively under load.
  3. Inspect fuses and relays powering ignition circuits, BCM and instrument cluster; replace any blown fuses.
  4. Visually inspect ignition switch and harness; unplug connectors and check pins for corrosion, bending or damage. Back-probe ignition switch terminals and observe voltage change through OFF → ACC → RUN → START.
  5. With scan tool monitoring live data, cycle ignition key and confirm the ignition state value reported by the logging module and by the BCM/instrument cluster. Compare messages across modules to locate where the state is lost or inconsistent.
  6. Check CAN bus health (resistance, presence of CAN high/low signals, no shorts to power or ground). Repair wiring or connectors if CAN communication errors are present.
  7. If wiring and battery are good, test or substitute the ignition switch / keyless ignition module if possible. Also confirm correct immobiliser/key recognition.
  8. Update module software where Technical Service Bulletins (TSBs) or software fixes are available; reprogram modules if instructed by manufacturer guidance.
  9. After repairs, clear codes and perform several ignition cycles and a road test while monitoring live data to ensure fault does not recur.
  10. If the fault persists and wiring/ignition switch are verified good, consider bench testing or replacing the implicated control module per manufacturer procedures.

Likely causes

  • Intermittent/loose connector at ignition switch or BCM
  • Corroded or damaged ignition harness or pin
  • Weak battery causing voltage drop during key events
  • Failed ignition switch contact for one or more positions
  • Module reporting error due to firmware or configuration issue

Fault status

⚠️ Status
Ignition status 1 — ignition position/signal missing, incorrect or intermittent as detected by vehicle control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

B1140 B1141 B1143 B1150 B1200
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