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Home / DTC / B1B05 — Transponder 3 key

B1B05 — Transponder 3 key

Detailed page for trouble code B1B05.

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Code

B1B05

LAND ROVER B — Body

Transponder 3 key

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

Causes

  • Damaged or failed transponder chip in key 3
  • Key not programmed or incorrectly registered in immobiliser
  • Damaged or misaligned antenna/coil (reader) around ignition/steering column
  • Poor wiring, connectors, power or ground to immobiliser/antenna module
  • Intermittent CAN or serial communication between immobiliser and body/engine modules
  • Software/configuration error or lost key data in immobiliser module

Symptoms

  • Engine crank and no-start or intermittent starting problems when using key 3
  • Security/immobiliser warning lamp illuminated or flashing
  • Other keys start the vehicle normally (if they are programmed)
  • No remote or keyless entry functions from key 3 (if integrated)
  • Stored immobiliser/BCM communication related fault codes

What to check

  • Verify the condition of key 3 (visible damage, water ingress, wear).
  • Try other known-good keys — note whether problem is limited to key 3.
  • Scan immobiliser, BCM and engine ECU for related codes and freeze frame data.
  • Use dealer or capable diagnostic tool to read transponder UID and registration status for key 3.
  • Check antenna/coil resistance and connector for corrosion, secure fit and continuity.
  • Verify power and ground supplies to immobiliser/antenna module with ignition on.

Signal parameters

  • Transponder presence/UID returned by immobiliser reader (expected: valid numeric UID for each programmed key)
  • Antenna/reader supply voltage present with ignition ON (check vehicle-specific service data)
  • Antenna/reader continuity/resistance within manufacturer specification (check service manual)
  • Immobiliser module status and key recognition CAN messages (Key recognized / Key not recognised)
  • Related fault codes in BCM/engine ECU indicating communication failures

Diagnostic algorithm

  1. Confirm the fault: Connect a diagnostic tool and read code B1B05 and any related codes in immobiliser, BCM and engine ECU. Record freeze frame data.
  2. Key isolation: Attempt to start the vehicle with key 3 and with a known-good spare key. If only key 3 fails, focus on the key and reader.
  3. Read UID: With diagnostic capable of immobiliser functions, attempt to read the transponder UID for key 3. If no UID or invalid UID is returned, suspect the key or reader.
  4. Visual inspection: Inspect key 3 for physical damage, moisture or corrosion. Check the antenna ring/coil for damage and correct positioning around ignition or reader.
  5. Electrical checks: With ignition ON, measure supply voltage and ground at the immobiliser/antenna module connectors. Check antenna coil continuity/resistance per service specs.
  6. Communication checks: Verify CAN/serial communication between immobiliser and BCM/engine ECU. Look for U-codes or bus errors that may prevent key authentication.
  7. Reprogram/test: If key is intact and reader passes tests, attempt to reprogram or re-register key 3 using the manufacturer diagnostic procedure. Confirm whether the module accepts the key.
  8. Isolate/replace: If the antenna or wiring is faulty, repair or replace as required. If the key transponder is defective, replace or cut/program a new key. If immobiliser module has corrupted data or is faulty, further module-level diagnostics or replacement and dealer-level programming may be required.
  9. Verify repair: Clear codes and confirm that key 3 is recognised reliably in multiple start cycles and that no related codes return.

Likely causes

  • Key 3 transponder chip failure or physical damage
  • Key 3 not present/never programmed
  • Antenna ring/coax around ignition/reader fault
  • Connector/wiring fault to immobiliser module
  • Immobiliser module internal fault or corrupted key data

Fault status

⚠️ Status
Immobiliser: Transponder (key 3) not recognised / authentication failure.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1B00 B1B01 B1B02 B1B03 B1B04 B1B06
413

Browse 413 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

B1B05

MITSUBISHI B — Body

DR.ABG squib(2) high

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

Causes

  • Damaged or failed transponder chip in key 3
  • Key not programmed or incorrectly registered in immobiliser
  • Damaged or misaligned antenna/coil (reader) around ignition/steering column
  • Poor wiring, connectors, power or ground to immobiliser/antenna module
  • Intermittent CAN or serial communication between immobiliser and body/engine modules
  • Software/configuration error or lost key data in immobiliser module

Symptoms

  • Engine crank and no-start or intermittent starting problems when using key 3
  • Security/immobiliser warning lamp illuminated or flashing
  • Other keys start the vehicle normally (if they are programmed)
  • No remote or keyless entry functions from key 3 (if integrated)
  • Stored immobiliser/BCM communication related fault codes

What to check

  • Verify the condition of key 3 (visible damage, water ingress, wear).
  • Try other known-good keys — note whether problem is limited to key 3.
  • Scan immobiliser, BCM and engine ECU for related codes and freeze frame data.
  • Use dealer or capable diagnostic tool to read transponder UID and registration status for key 3.
  • Check antenna/coil resistance and connector for corrosion, secure fit and continuity.
  • Verify power and ground supplies to immobiliser/antenna module with ignition on.

Signal parameters

  • Transponder presence/UID returned by immobiliser reader (expected: valid numeric UID for each programmed key)
  • Antenna/reader supply voltage present with ignition ON (check vehicle-specific service data)
  • Antenna/reader continuity/resistance within manufacturer specification (check service manual)
  • Immobiliser module status and key recognition CAN messages (Key recognized / Key not recognised)
  • Related fault codes in BCM/engine ECU indicating communication failures

Diagnostic algorithm

  1. Confirm the fault: Connect a diagnostic tool and read code B1B05 and any related codes in immobiliser, BCM and engine ECU. Record freeze frame data.
  2. Key isolation: Attempt to start the vehicle with key 3 and with a known-good spare key. If only key 3 fails, focus on the key and reader.
  3. Read UID: With diagnostic capable of immobiliser functions, attempt to read the transponder UID for key 3. If no UID or invalid UID is returned, suspect the key or reader.
  4. Visual inspection: Inspect key 3 for physical damage, moisture or corrosion. Check the antenna ring/coil for damage and correct positioning around ignition or reader.
  5. Electrical checks: With ignition ON, measure supply voltage and ground at the immobiliser/antenna module connectors. Check antenna coil continuity/resistance per service specs.
  6. Communication checks: Verify CAN/serial communication between immobiliser and BCM/engine ECU. Look for U-codes or bus errors that may prevent key authentication.
  7. Reprogram/test: If key is intact and reader passes tests, attempt to reprogram or re-register key 3 using the manufacturer diagnostic procedure. Confirm whether the module accepts the key.
  8. Isolate/replace: If the antenna or wiring is faulty, repair or replace as required. If the key transponder is defective, replace or cut/program a new key. If immobiliser module has corrupted data or is faulty, further module-level diagnostics or replacement and dealer-level programming may be required.
  9. Verify repair: Clear codes and confirm that key 3 is recognised reliably in multiple start cycles and that no related codes return.

Likely causes

  • Key 3 transponder chip failure or physical damage
  • Key 3 not present/never programmed
  • Antenna ring/coax around ignition/reader fault
  • Connector/wiring fault to immobiliser module
  • Immobiliser module internal fault or corrupted key data

Fault status

⚠️ Status
Immobiliser: Transponder (key 3) not recognised / authentication failure.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1B00 B1B01 B1B02 B1B03 B1B04 B1B06
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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