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Home / DTC / B1681 — the signal from the transceiver module of the theft system is not received

B1681 — the signal from the transceiver module of the theft system is not received

Detailed page for trouble code B1681.

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11,841generic
22,491specific
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Code

B1681

LAND ROVER B — Body

the signal from the transceiver module of the theft system is not received

Brand: LAND ROVER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse or poor power/ground to the transceiver/antenna module
  • Damaged or disconnected antenna, antenna coax, or wiring harness
  • Failed transceiver or receiver module
  • Lost or faulty communication on vehicle data bus (CAN/LIN) to security module
  • Weak or dead key fob/transponder battery or damaged key
  • Interference or incorrect frequency RF reception

Symptoms

  • Remote keyless entry or immobilizer not operating
  • Vehicle fails to recognize key, no remote unlock or start function
  • Security/immobilizer warning lamp illuminated or flashing
  • Intermittent or permanent inability to start the engine
  • No response from keyfob or inconsistent remote range

What to check

  • Read all related DTCs and stored freeze/frame data with a factory-level scan tool
  • Check battery voltage (vehicle and keyfob) and verify charging system
  • Inspect fuses and relay for the theft/transceiver circuit
  • Visually inspect transceiver, antenna, and harness connectors for damage or corrosion
  • Check for loss of communication errors (CAN/LIN) on scan tool
  • Try spare/known-good key or keyfob to confirm key issue vs vehicle

Signal parameters

  • Power supply: 9–16 V typical at transceiver supply pin with ignition on
  • Ground: low resistance continuity from transceiver ground to chassis
  • RF receive frequency: typical keyfob 315 MHz (NA) or 433/434 MHz (EU); receive level should be within expected sensitivity (module dependent)
  • Data bus: CAN/LIN messages present on security module network when scanned (no bus errors)
  • Key transponder: immobilizer transponder ID and rolling code data expected on module when key presented

Diagnostic algorithm

  1. Read and note all DTCs, clear codes and attempt to reproduce B1681. Record when/how it returns.
  2. Verify vehicle battery voltage >12.0 V (engine off) and check charging system with engine running.
  3. Inspect and test fuses/relays for the theft/transceiver circuit; replace if blown and retest.
  4. Check power and ground at the transceiver module connector with a DVOM. Repair wiring or grounds that are out of range.
  5. Visually inspect the antenna(s), coax and connectors for damage, corrosion, or disconnect; repair or reconnect as needed.
  6. Use a scan tool to check for module presence and communication on the CAN/LIN bus. Diagnose any bus faults (shorts, opens, high resistance).
  7. Test with a known-good key/keyfob or swap battery in the fob. Attempt re-learn or re‑program procedure per manufacturer instructions.
  8. If RF reception suspected, check for local RF interference or use RF test equipment or a dealer-level tool to confirm receiver sensitivity (if available).
  9. If wiring, power, ground and bus comms are good but fault persists, consider replacing or reprogramming the transceiver module following manufacturer procedures.
  10. After repairs, clear codes and perform full function test (lock/unlock, immobilizer recognition, start) and road test if applicable.

Likely causes

  • Fuse for the theft/transceiver module blown or poor ground at module
  • Broken antenna cable or connector at the transceiver/receiver
  • Transceiver module internal failure
  • Key fob battery dead or key not programmed
  • CAN or LIN bus open/short or connector corrosion interrupting module messages
  • Vehicle module requiring software update or re-flash

Fault status

⚠️ Status
No signal received from theft system transceiver module — transceiver communication or RF reception fault detected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B1680 B1682 B2799 U0100 U0140
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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