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Home / DTC / B1600 — The passive signal from the ignition key transponder of the theft protection system not received

B1600 — The passive signal from the ignition key transponder of the theft protection system not received

Detailed page for trouble code B1600.

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Code

B1600

LAND ROVER B — Body

The passive signal from the ignition key transponder of the theft protection system not received

Brand: LAND ROVER
Type: B — Body
Views: UK: 20 EN: 33 RU: 15
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or unprogrammed key transponder
  • Damaged or disconnected immobiliser antenna ring (coil) around ignition barrel
  • Damaged wiring or poor connector contacts between antenna and immobiliser module/BCM
  • Immobiliser module (IMMO/BCM) fault or lost communication with engine ECU
  • Blown fuse or loss of power/ground to immobiliser/antenna circuit
  • Water ingress or corrosion at antenna/module connectors

Symptoms

  • Engine will not crank or will crank but not start
  • Security/immobiliser warning lamp illuminated or flashing
  • Intermittent no-start condition depending on key/position
  • Remote locking/unlocking may still work (if separate), but key not recognised for start
  • Starter disabled or slow/no crank

What to check

  • Read and record stored codes from all modules (BCM/immobiliser/engine ECU); note related communications codes
  • Check immobiliser/security lamp behaviour during key insertion and start attempt
  • Attempt start with known-good/spare key to confirm key transponder issue
  • Use dealer-level or compatible diagnostic tool to request transponder ID and see if antenna/module reads it
  • Visually inspect antenna ring and connectors around ignition barrel for damage, corrosion or water ingress
  • Check fuses and relays supplying immobiliser/BCM and antenna power/ground

Signal parameters

  • Transponder ID read status (presence/absence) from immobiliser diagnostic response
  • Antenna/coil continuity and resistance check (compare against manufacturer spec)
  • 12 V supply and ground integrity at immobiliser module and antenna circuit
  • Immobiliser/BCM diagnostic live data: transponder recognized flag, key ID value
  • CAN/serial communication alive signals between immobiliser module and engine ECU

Diagnostic algorithm

  1. Connect a diagnostic scanner and read all stored and pending codes from BCM, immobiliser and engine ECU; record freeze frame or snapshots.
  2. Verify immobiliser/security lamp behaviour when inserting key and attempting start; note any differences with spare key.
  3. Attempt to read transponder ID with diagnostic tool. If ID is read, compare to stored/authorized keys in module.
  4. Try a known-good or dealer-programmed spare key. If spare works, suspect primary key transponder fault or programming.
  5. Inspect ignition barrel area and antenna ring for physical damage, corrosion or water entry. Repair or replace as required.
  6. With ignition off, check fuses and relays for the immobiliser/BCM power; then with ignition on, measure module supply voltage and ground.
  7. Check continuity and resistance of antenna coil and wiring to immobiliser/BCM; replace antenna if open/short or out of spec.
  8. Scan for CAN/communication errors; if communication is lost, diagnose wiring, connectors and other modules on the network.
  9. If wiring, power and antenna are good but transponder still not read, consider immobiliser module fault — confirm with module bench test or swap where possible.
  10. If keys need reprogramming or module replacement is performed, follow manufacturer programming and security procedures to avoid erasing all keys; use dealer-level equipment as required.
  11. Clear codes and retest. Document intermittent behavior; if intermittent, perform road/usage simulation to reproduce.

Likely causes

  • Antenna coil around ignition switch failed or connector loose
  • Key transponder damaged or not programmed for vehicle
  • Power or ground fault to immobiliser module
  • Module lost CAN/serial communication with engine ECU

Fault status

⚠️ Status
Immobiliser: Key transponder signal not received. Vehicle may refuse to start. Verify key, antenna and immobiliser circuitry.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B1601 B1602 U0073 P1622 B1650
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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Code

B1600

MITSUBISHI B — Body

FL impact sensor open

Brand: MITSUBISHI
Type: B — Body
Views: UK: 19 EN: 37 RU: 14
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or unprogrammed key transponder
  • Damaged or disconnected immobiliser antenna ring (coil) around ignition barrel
  • Damaged wiring or poor connector contacts between antenna and immobiliser module/BCM
  • Immobiliser module (IMMO/BCM) fault or lost communication with engine ECU
  • Blown fuse or loss of power/ground to immobiliser/antenna circuit
  • Water ingress or corrosion at antenna/module connectors

Symptoms

  • Engine will not crank or will crank but not start
  • Security/immobiliser warning lamp illuminated or flashing
  • Intermittent no-start condition depending on key/position
  • Remote locking/unlocking may still work (if separate), but key not recognised for start
  • Starter disabled or slow/no crank

What to check

  • Read and record stored codes from all modules (BCM/immobiliser/engine ECU); note related communications codes
  • Check immobiliser/security lamp behaviour during key insertion and start attempt
  • Attempt start with known-good/spare key to confirm key transponder issue
  • Use dealer-level or compatible diagnostic tool to request transponder ID and see if antenna/module reads it
  • Visually inspect antenna ring and connectors around ignition barrel for damage, corrosion or water ingress
  • Check fuses and relays supplying immobiliser/BCM and antenna power/ground

Signal parameters

  • Transponder ID read status (presence/absence) from immobiliser diagnostic response
  • Antenna/coil continuity and resistance check (compare against manufacturer spec)
  • 12 V supply and ground integrity at immobiliser module and antenna circuit
  • Immobiliser/BCM diagnostic live data: transponder recognized flag, key ID value
  • CAN/serial communication alive signals between immobiliser module and engine ECU

Diagnostic algorithm

  1. Connect a diagnostic scanner and read all stored and pending codes from BCM, immobiliser and engine ECU; record freeze frame or snapshots.
  2. Verify immobiliser/security lamp behaviour when inserting key and attempting start; note any differences with spare key.
  3. Attempt to read transponder ID with diagnostic tool. If ID is read, compare to stored/authorized keys in module.
  4. Try a known-good or dealer-programmed spare key. If spare works, suspect primary key transponder fault or programming.
  5. Inspect ignition barrel area and antenna ring for physical damage, corrosion or water entry. Repair or replace as required.
  6. With ignition off, check fuses and relays for the immobiliser/BCM power; then with ignition on, measure module supply voltage and ground.
  7. Check continuity and resistance of antenna coil and wiring to immobiliser/BCM; replace antenna if open/short or out of spec.
  8. Scan for CAN/communication errors; if communication is lost, diagnose wiring, connectors and other modules on the network.
  9. If wiring, power and antenna are good but transponder still not read, consider immobiliser module fault — confirm with module bench test or swap where possible.
  10. If keys need reprogramming or module replacement is performed, follow manufacturer programming and security procedures to avoid erasing all keys; use dealer-level equipment as required.
  11. Clear codes and retest. Document intermittent behavior; if intermittent, perform road/usage simulation to reproduce.

Likely causes

  • Antenna coil around ignition switch failed or connector loose
  • Key transponder damaged or not programmed for vehicle
  • Power or ground fault to immobiliser module
  • Module lost CAN/serial communication with engine ECU

Fault status

⚠️ Status
Immobiliser: Key transponder signal not received. Vehicle may refuse to start. Verify key, antenna and immobiliser circuitry.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B1601 B1602 U0073 P1622 B1650
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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Code

B1600

Other B — Body

PATS Ignition Key Transponder Signal Is Not Received

Brand: Other
Type: B — Body
Views: UK: 33 EN: 57 RU: 30
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or unprogrammed key transponder
  • Damaged or disconnected immobiliser antenna ring (coil) around ignition barrel
  • Damaged wiring or poor connector contacts between antenna and immobiliser module/BCM
  • Immobiliser module (IMMO/BCM) fault or lost communication with engine ECU
  • Blown fuse or loss of power/ground to immobiliser/antenna circuit
  • Water ingress or corrosion at antenna/module connectors

Symptoms

  • Engine will not crank or will crank but not start
  • Security/immobiliser warning lamp illuminated or flashing
  • Intermittent no-start condition depending on key/position
  • Remote locking/unlocking may still work (if separate), but key not recognised for start
  • Starter disabled or slow/no crank

What to check

  • Read and record stored codes from all modules (BCM/immobiliser/engine ECU); note related communications codes
  • Check immobiliser/security lamp behaviour during key insertion and start attempt
  • Attempt start with known-good/spare key to confirm key transponder issue
  • Use dealer-level or compatible diagnostic tool to request transponder ID and see if antenna/module reads it
  • Visually inspect antenna ring and connectors around ignition barrel for damage, corrosion or water ingress
  • Check fuses and relays supplying immobiliser/BCM and antenna power/ground

Signal parameters

  • Transponder ID read status (presence/absence) from immobiliser diagnostic response
  • Antenna/coil continuity and resistance check (compare against manufacturer spec)
  • 12 V supply and ground integrity at immobiliser module and antenna circuit
  • Immobiliser/BCM diagnostic live data: transponder recognized flag, key ID value
  • CAN/serial communication alive signals between immobiliser module and engine ECU

Diagnostic algorithm

  1. Connect a diagnostic scanner and read all stored and pending codes from BCM, immobiliser and engine ECU; record freeze frame or snapshots.
  2. Verify immobiliser/security lamp behaviour when inserting key and attempting start; note any differences with spare key.
  3. Attempt to read transponder ID with diagnostic tool. If ID is read, compare to stored/authorized keys in module.
  4. Try a known-good or dealer-programmed spare key. If spare works, suspect primary key transponder fault or programming.
  5. Inspect ignition barrel area and antenna ring for physical damage, corrosion or water entry. Repair or replace as required.
  6. With ignition off, check fuses and relays for the immobiliser/BCM power; then with ignition on, measure module supply voltage and ground.
  7. Check continuity and resistance of antenna coil and wiring to immobiliser/BCM; replace antenna if open/short or out of spec.
  8. Scan for CAN/communication errors; if communication is lost, diagnose wiring, connectors and other modules on the network.
  9. If wiring, power and antenna are good but transponder still not read, consider immobiliser module fault — confirm with module bench test or swap where possible.
  10. If keys need reprogramming or module replacement is performed, follow manufacturer programming and security procedures to avoid erasing all keys; use dealer-level equipment as required.
  11. Clear codes and retest. Document intermittent behavior; if intermittent, perform road/usage simulation to reproduce.

Likely causes

  • Antenna coil around ignition switch failed or connector loose
  • Key transponder damaged or not programmed for vehicle
  • Power or ground fault to immobiliser module
  • Module lost CAN/serial communication with engine ECU

Fault status

⚠️ Status
Immobiliser: Key transponder signal not received. Vehicle may refuse to start. Verify key, antenna and immobiliser circuitry.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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