B2091

Code

LAND ROVER B — Body

Remote key Failure in keyless entry communication

Brand: LAND ROVER

Type: B — Body

Views: UK: 19 EN: 71 RU: 15

AI status

Completed

ready

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Page language: EN

Causes

Weak or dead key fob battery
Damaged or non‑functional key fob (internal electronics)
Faulty keyless entry antenna/receiver module (RFA/RKE)
Poor or corroded connectors, wiring damage or poor ground to the module
Software/firmware mismatch or corrupted module memory
CAN/LIN network communication errors between modules

Symptoms

Keyless entry/unlock/lock does not work or is intermittent
Vehicle displays 'Key Not Detected' or similar warning
Unable to start vehicle using keyless start
Intermittent locking/unlocking, or range greatly reduced
One key works while another does not

What to check

Retrieve all stored DTCs with a diagnostic scan tool and note related network codes
Verify correct vehicle battery voltage (approx. 11–14 V) and check fuses for RFA/RKE
Check and measure key fob battery voltage (replace if below ~2.5–3.0 V)
Try a known‑good spare key fob and test operation
Inspect antenna/receiver connectors and wiring for corrosion, damage or poor grounds
Check module power and ground circuits at the receiver/module

Signal parameters

Key fob battery voltage (typical CR2032 ≈ 3.0 V nominal)
Vehicle supply voltage to receiver/module (≈ 11–14 V)
RF carrier frequency depends on region (commonly 315, 433 or 868 MHz)
Received signal strength indicator (RSSI) or packet error rate where available
Key unique ID and rolling code sequence validity
CAN/LIN message presence and error counters for the keyless module

Diagnostic algorithm

Connect a diagnostic tool, read and record DTCs and live data from keyless/immobiliser/RFA modules.
Confirm vehicle battery and fuses are good. Clear codes, attempt to reproduce fault.
Check key fob battery voltage; replace battery and retest with each key. Verify spare key operation.
Inspect receiver/antenna module connectors, wiring harness and ground points; repair any damage or corrosion.
Check module power supply and ground at the receiver; verify CAN/LIN communication with the module using the diagnostic tool.
If available, view RF receive metrics (RSSI/packet errors) while operating key fob at different distances/angles.
Attempt a re‑learn/programming procedure for the suspect key using manufacturer procedures or diagnostic tool.
If problem persists and module shows internal fault or no communication, consult technical service bulletins and consider software update or replacement of the receiver/module.
After repairs, clear DTCs, test all keys over range and repeat diagnostic scan to confirm no reoccurrence.

Likely causes

Key fob battery is dead or very weak
Single key fob failed (try spare key)
Receiver/antenna module fault or connector issue
Module lost communication on vehicle network

Fault status

⚠️ Status

Remote key communication fault: keyless entry receiver or key fob not communicating reliably. Check keys, battery, wiring and receiver.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.5 hours

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Browse 291 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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