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Home / DTC / B1B19 — Key of identifier 17

B1B19 — Key of identifier 17

Detailed page for trouble code B1B19.

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Code

B1B19

LAND ROVER B — Body

Key of identifier 17

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

Causes

  • Key transponder ID not registered or erased
  • Damaged or blank key transponder
  • Weak or dead key fob battery (RF functions)
  • Immobiliser/antenna ring fault or poor antenna power/signal
  • Wiring or connector fault between antenna and BCM/immobiliser
  • Module configuration or software mismatch after module replacement or update

Symptoms

  • Engine cranks but will not start, or no crank depending on immobiliser behaviour
  • Security/warning lamp illuminated on dash (security/immobiliser)
  • Key not recognised messages or 'Key not detected' on display
  • Remote lock/unlock or keyless start not working for affected key
  • Intermittent recognition of the key (works sometimes, fails other times)

What to check

  • Scan all modules; record B1B19 and any related security/immobiliser DTCs
  • Try known-good/spare keys to see if they are recognised
  • Check and replace key fob battery, retest RF functions
  • Inspect immobiliser antenna ring and connectors at the ignition barrel or push-button start area
  • Inspect wiring and grounds between antenna and BCM/immobiliser for damage or corrosion
  • Check module software part numbers and recent service history for module replacement or reflash

Signal parameters

  • Transponder wake/ID response (125 kHz transponder data) - presence/ID value
  • RF key fob transmit frequency and button press events (e.g., 315/433 MHz telemetry)
  • Immobiliser antenna supply voltage and return (0V/12V or expected nominal)
  • CAN/LIN messages between BCM, immobiliser and instrument cluster (key ID and auth status messages)
  • Key registration list stored in BCM/immobiliser (number of keys, stored IDs)
  • Event timestamps for key read attempts and authentication result

Diagnostic algorithm

  1. Retrieve full freeze frame and all relevant security/BCM/immobiliser codes; note conditions when code set.
  2. Attempt vehicle start using another known-good key. If the spare key works, suspect the reported key or key programming.
  3. Replace key fob battery and retest remote/keyless recognition.
  4. Use a diagnostic tool capable of reading immobiliser/key ID lists to confirm whether identifier 17 is present and valid in the module.
  5. Monitor live data while attempting to read the key: verify antenna wake signal, transponder ID read, and auth result. Record failures.
  6. Inspect and test antenna ring and its connectors; measure power and signal continuity between antenna and immobiliser/BCM.
  7. Check wiring harnesses for damage, corrosion, or poor grounds that could interrupt communications.
  8. If modules were recently replaced or reprogrammed, confirm correct software/calibration and perform reinitialisation or module coding per manufacturer procedure.
  9. If key is missing from the BCM database, reprogram/register the key using manufacturer-approved diagnostic equipment following security procedures.
  10. Clear codes and retest all affected functions. If intermittent faults persist, consider replacing faulty antenna or immobiliser module as guided by test results and manufacturer instructions.

Likely causes

  • Key not programmed to vehicle (most likely if new/replaced key)
  • Key battery dead or poor RF from key fob
  • Faulty immobiliser antenna or connector (common cause of intermittent recognition)
  • Module software or configuration mismatch after replacement or flashing

Fault status

⚠️ Status
Key identifier 17 not detected or invalid in immobiliser/BCM. May prevent key recognition, remote/keyless functions or engine start until key is reprogrammed or underlying fault repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

B1B10 B1B11 B1B12 B1B13 B1B14
277

Browse 277 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

B1B19

MITSUBISHI B — Body

Left curtain ABG squib high

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

Causes

  • Key transponder ID not registered or erased
  • Damaged or blank key transponder
  • Weak or dead key fob battery (RF functions)
  • Immobiliser/antenna ring fault or poor antenna power/signal
  • Wiring or connector fault between antenna and BCM/immobiliser
  • Module configuration or software mismatch after module replacement or update

Symptoms

  • Engine cranks but will not start, or no crank depending on immobiliser behaviour
  • Security/warning lamp illuminated on dash (security/immobiliser)
  • Key not recognised messages or 'Key not detected' on display
  • Remote lock/unlock or keyless start not working for affected key
  • Intermittent recognition of the key (works sometimes, fails other times)

What to check

  • Scan all modules; record B1B19 and any related security/immobiliser DTCs
  • Try known-good/spare keys to see if they are recognised
  • Check and replace key fob battery, retest RF functions
  • Inspect immobiliser antenna ring and connectors at the ignition barrel or push-button start area
  • Inspect wiring and grounds between antenna and BCM/immobiliser for damage or corrosion
  • Check module software part numbers and recent service history for module replacement or reflash

Signal parameters

  • Transponder wake/ID response (125 kHz transponder data) - presence/ID value
  • RF key fob transmit frequency and button press events (e.g., 315/433 MHz telemetry)
  • Immobiliser antenna supply voltage and return (0V/12V or expected nominal)
  • CAN/LIN messages between BCM, immobiliser and instrument cluster (key ID and auth status messages)
  • Key registration list stored in BCM/immobiliser (number of keys, stored IDs)
  • Event timestamps for key read attempts and authentication result

Diagnostic algorithm

  1. Retrieve full freeze frame and all relevant security/BCM/immobiliser codes; note conditions when code set.
  2. Attempt vehicle start using another known-good key. If the spare key works, suspect the reported key or key programming.
  3. Replace key fob battery and retest remote/keyless recognition.
  4. Use a diagnostic tool capable of reading immobiliser/key ID lists to confirm whether identifier 17 is present and valid in the module.
  5. Monitor live data while attempting to read the key: verify antenna wake signal, transponder ID read, and auth result. Record failures.
  6. Inspect and test antenna ring and its connectors; measure power and signal continuity between antenna and immobiliser/BCM.
  7. Check wiring harnesses for damage, corrosion, or poor grounds that could interrupt communications.
  8. If modules were recently replaced or reprogrammed, confirm correct software/calibration and perform reinitialisation or module coding per manufacturer procedure.
  9. If key is missing from the BCM database, reprogram/register the key using manufacturer-approved diagnostic equipment following security procedures.
  10. Clear codes and retest all affected functions. If intermittent faults persist, consider replacing faulty antenna or immobiliser module as guided by test results and manufacturer instructions.

Likely causes

  • Key not programmed to vehicle (most likely if new/replaced key)
  • Key battery dead or poor RF from key fob
  • Faulty immobiliser antenna or connector (common cause of intermittent recognition)
  • Module software or configuration mismatch after replacement or flashing

Fault status

⚠️ Status
Key identifier 17 not detected or invalid in immobiliser/BCM. May prevent key recognition, remote/keyless functions or engine start until key is reprogrammed or underlying fault repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

B1B10 B1B11 B1B12 B1B13 B1B14
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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