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Home / DTC / B1B06 — transponder 4 key

B1B06 — transponder 4 key

Detailed page for trouble code B1B06.

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22,491specific
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Code

B1B06

LAND ROVER B — Body

transponder 4 key

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

Causes

  • Damaged or unprogrammed transponder in key 4
  • Weak or exhausted key battery (for smart/proximity keys)
  • Faulty or damaged antenna ring/coil (immobilizer reader) around ignition or start button
  • Open/short or poor wiring/connectors between antenna ring and immobilizer module
  • Immobilizer (body/TPMS/security) control module fault or corrupted software
  • Corrosion or water damage to key or antenna area

Symptoms

  • Key 4 not recognised by vehicle (immobilizer/security lamp illuminated)
  • Engine cranks but will not start when using key 4, or no crank depending on security states
  • Intermittent start failures with key 4 only
  • No response from keyless entry or push-button start with key 4
  • Possible stored related DTCs in immobilizer / body control module

What to check

  • Use a capable diagnostic tool to read and record all related DTCs from the immobilizer/body control module and engine control module
  • Attempt to start/operate vehicle with key 4 and with a known-good key to compare behaviour
  • Check that key 4 is present in the vehicle key list/programming in the immobilizer module
  • Inspect key (physical damage, water ingress) and replace key battery if applicable
  • Visually inspect antenna ring/reader and connectors for damage or corrosion
  • Check fuses and power/ground to immobilizer and antenna circuits

Signal parameters

  • Transponder response: unique key ID/serial expected when key presented to reader
  • Wake/read event expected when key within proximity or turned in ignition
  • Response timing: transponder ID should be received within a short timeout (manufacturer typical
  • Vehicle battery: nominal 12 V supply to immobilizer/antena circuits (should be within ~11–15 V during test)
  • Diagnostic data: immobilizer module reports key IDs, key status flags, and communication status on CAN

Diagnostic algorithm

  1. Read and record B1B06 plus any other related codes from immobilizer/body control and engine modules. Note freeze frame or occurrence data if available.
  2. Confirm symptom: try to start/operate vehicle using key 4 and also with a known-good key. Observe immobilizer/security lamp and starter behaviour.
  3. Check key programming list in the immobilizer module with manufacturer scan tool to confirm key 4 is present or flagged as invalid.
  4. If key is battery-powered (smart/proximity), replace key battery and retest reading/operation.
  5. Use diagnostic tool function to read the transponder ID when key 4 is presented at the reader. If no ID is read, suspect key or antenna ring.
  6. Inspect antenna ring/reader and associated wiring/connectors for damage, loose pins, corrosion, or water ingress. Wiggle test connectors while monitoring for changes in diagnostic readout.
  7. Measure continuity/resistance of antenna coil per manufacturer data (compare to known-good or spec). Check for supply voltage to reader when key is presented.
  8. Check CAN/communication messages between immobilizer and engine ECU for errors; address any communication faults first.
  9. If antenna and wiring are good and other keys read fine, try reprogramming key 4 using manufacturer diagnostic procedures. Follow secure key programming steps (do not attempt insecure bypass).
  10. If key still not recognised after reprogramming and wiring is good, consider replacing antenna module or immobilizer module; module replacement usually requires dealer-level programming.
  11. After repairs/programming, clear codes and perform full retest with all keys; confirm no further occurrences and that all keys operate correctly.

Likely causes

  • Key 4 transponder element failed (most common)
  • Antenna ring failing to energise/read transponder
  • Intermittent wiring/connectors between antenna and immobilizer module
  • Key battery low causing weak response
  • Module configuration or programming mismatch after replacement or battery disconnect

Fault status

⚠️ Status
Transponder Key 4 — immobilizer not detecting/validating transponder (Key 4 fault)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

B1B00 B1B01 B1B02 B1B03 B1B04 B1B05
320

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

LAND ROVER

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Code

B1B06

MITSUBISHI B — Body

DR.ABG squib(2) open

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

Causes

  • Damaged or unprogrammed transponder in key 4
  • Weak or exhausted key battery (for smart/proximity keys)
  • Faulty or damaged antenna ring/coil (immobilizer reader) around ignition or start button
  • Open/short or poor wiring/connectors between antenna ring and immobilizer module
  • Immobilizer (body/TPMS/security) control module fault or corrupted software
  • Corrosion or water damage to key or antenna area

Symptoms

  • Key 4 not recognised by vehicle (immobilizer/security lamp illuminated)
  • Engine cranks but will not start when using key 4, or no crank depending on security states
  • Intermittent start failures with key 4 only
  • No response from keyless entry or push-button start with key 4
  • Possible stored related DTCs in immobilizer / body control module

What to check

  • Use a capable diagnostic tool to read and record all related DTCs from the immobilizer/body control module and engine control module
  • Attempt to start/operate vehicle with key 4 and with a known-good key to compare behaviour
  • Check that key 4 is present in the vehicle key list/programming in the immobilizer module
  • Inspect key (physical damage, water ingress) and replace key battery if applicable
  • Visually inspect antenna ring/reader and connectors for damage or corrosion
  • Check fuses and power/ground to immobilizer and antenna circuits

Signal parameters

  • Transponder response: unique key ID/serial expected when key presented to reader
  • Wake/read event expected when key within proximity or turned in ignition
  • Response timing: transponder ID should be received within a short timeout (manufacturer typical
  • Vehicle battery: nominal 12 V supply to immobilizer/antena circuits (should be within ~11–15 V during test)
  • Diagnostic data: immobilizer module reports key IDs, key status flags, and communication status on CAN

Diagnostic algorithm

  1. Read and record B1B06 plus any other related codes from immobilizer/body control and engine modules. Note freeze frame or occurrence data if available.
  2. Confirm symptom: try to start/operate vehicle using key 4 and also with a known-good key. Observe immobilizer/security lamp and starter behaviour.
  3. Check key programming list in the immobilizer module with manufacturer scan tool to confirm key 4 is present or flagged as invalid.
  4. If key is battery-powered (smart/proximity), replace key battery and retest reading/operation.
  5. Use diagnostic tool function to read the transponder ID when key 4 is presented at the reader. If no ID is read, suspect key or antenna ring.
  6. Inspect antenna ring/reader and associated wiring/connectors for damage, loose pins, corrosion, or water ingress. Wiggle test connectors while monitoring for changes in diagnostic readout.
  7. Measure continuity/resistance of antenna coil per manufacturer data (compare to known-good or spec). Check for supply voltage to reader when key is presented.
  8. Check CAN/communication messages between immobilizer and engine ECU for errors; address any communication faults first.
  9. If antenna and wiring are good and other keys read fine, try reprogramming key 4 using manufacturer diagnostic procedures. Follow secure key programming steps (do not attempt insecure bypass).
  10. If key still not recognised after reprogramming and wiring is good, consider replacing antenna module or immobilizer module; module replacement usually requires dealer-level programming.
  11. After repairs/programming, clear codes and perform full retest with all keys; confirm no further occurrences and that all keys operate correctly.

Likely causes

  • Key 4 transponder element failed (most common)
  • Antenna ring failing to energise/read transponder
  • Intermittent wiring/connectors between antenna and immobilizer module
  • Key battery low causing weak response
  • Module configuration or programming mismatch after replacement or battery disconnect

Fault status

⚠️ Status
Transponder Key 4 — immobilizer not detecting/validating transponder (Key 4 fault)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

B1B00 B1B01 B1B02 B1B03 B1B04 B1B05
406

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

MITSUBISHI

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

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