Code
B1240
LAND ROVER
B — Body
Start Indicator Mode
Views:
UK: 3
EN: 8
RU: 8
AI status
Completed
Completed
100%
Causes
- Faulty instrument cluster or indicator module
- Damaged wiring or poor connector contact in indicator/start circuit
- Blown fuse or poor battery/ground connection
- Loss of CAN/LIN communication between modules
- Failed start/stop or start indicator switch/module
- Software/configuration error or corrupted module calibration
Symptoms
- Start indicator lamp on dash behaves incorrectly (stuck on, off, flashing or inconsistent)
- Instrument cluster displays incorrect mode or warning messages related to start
- Start/stop system may not enter expected mode or may be disabled
- Related convenience functions intermittent or non-functional
- One or more other communication-related fault codes present
What to check
- Read all stored codes and freeze frame data with a capable diagnostic tool
- Check battery voltage (engine off) and charging system; low voltage can create network faults
- Inspect fuses and fuse holders related to instrument cluster and start/stop systems
- Visually inspect connectors and wiring to instrument cluster for corrosion, water ingress or damage
- Verify CAN/LIN bus activity using a scan tool (modules present and responding)
- Check for relevant Technical Service Bulletins or software updates
Signal parameters
- Battery feed to cluster/module: roughly 11–15 V when key on
- Ground continuity: near 0 Ω to chassis ground
- CAN bus: modules should respond to diagnostic requests; normal idle voltages ~2.5 V levels on CAN_H/CAN_L (tool-dependent)
- Indicator lamp/LED module: shows supply voltage when commanded; LED modules draw low current compared to incandescent bulbs
- Module wake/sleep signals and message rates per manufacturer service data
Diagnostic algorithm
- Connect OEM-capable diagnostic tool, read all stored and pending DTCs and note module communication status.
- Verify battery voltage and good ground connections. Re-test with fully charged battery if voltage is low.
- Check fuses and power feeds to the instrument cluster and related modules; replace any blown fuses and retest.
- Inspect instrument cluster connectors and wiring for corrosion, bent pins, or water damage; repair as needed.
- Use the diagnostic tool to check CAN/LIN network: list modules, check for timeouts or lost messages. Repair broken bus wiring or poor terminations.
- Command the start indicator on/off from the diagnostic tool (if supported) and observe behavior; note response or lack of response.
- If indicator module does not respond but power and communication are present, consider instrument cluster or indicator module replacement or repair.
- Check for software updates or reflash procedures for affected modules per dealer/service information before replacing hardware.
- After repairs, clear DTCs and verify the fault does not return during a road test and normal key cycles.
Likely causes
- Instrument cluster fault or internal module fault
- CAN bus communication fault or intermittent connection
- Corroded/damaged connector or wiring to cluster
- Blown fuse or low battery/poor ground
Fault status
Status
Start Indicator Mode — control or communication fault detected for start indicator / instrument cluster.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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