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Home / DTC / B1C39 — Key

B1C39 — Key

Detailed page for trouble code B1C39.

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59brands
11,844generic
22,491specific
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Code

B1C39

LAND ROVER B — Body

Key

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

Causes

  • Key transponder damaged or missing
  • Key fob battery low or dead
  • Key not programmed or lost programming
  • Immobiliser/BCM (body control module) antenna or wiring fault
  • Connector corrosion or poor grounding at key reader or module
  • Software or module communication error between modules (BCM/PKM/ECU)

Symptoms

  • Engine will not start or crank due to immobiliser preventing start
  • Security/immobiliser warning lamp or message in instrument cluster
  • Remote locking/unlocking or panic functions intermittent or not working
  • ‘Key not recognised’ or ‘Key faulty’ message displayed
  • Intermittent starting problems that resolve when using a different key

What to check

  • Check owner manual messages and warning lamps for key/immobiliser alerts
  • Attempt to start using a known-good spare key
  • Check and replace key fob battery, verify contacts and remote buttons operate
  • Read all stored DTCs from body/immobiliser/engine modules with appropriate diagnostic tool
  • Inspect key for physical or water damage
  • Inspect antenna/read coil, connectors and wiring for corrosion, damage, or poor ground

Signal parameters

  • Immobiliser LF transponder field typically ~125 kHz (wake/read coil)
  • Key fob RF transmit frequency typical 315/433 MHz (region dependent)
  • Key reader/antenna coil resistance — compare to manufacturer specification (typical coil resistances vary by model)
  • Connector voltages: 12 V supply to immobiliser/key module and proper ground
  • CAN/LIN bus communication between BCM and engine/immobiliser module (normal message traffic expected)

Diagnostic algorithm

  1. Confirm symptom and record exact instrument cluster messages and conditions when fault occurs
  2. Try a spare programmed key. If spare works, suspect primary key transponder or key internal fault
  3. Replace or test key fob battery and retest remote functions
  4. Use a compatible diagnostic tool to read and record all related DTCs from body/immobiliser and engine modules
  5. Inspect and test immobiliser antenna/read coil resistance and continuity; compare to factory spec
  6. Inspect wiring and connector pins for corrosion, bent pins or poor mating; repair as required
  7. Verify power and ground at key reader/immobiliser module and check module communications on CAN/LIN network
  8. If antenna and wiring are OK, attempt reprogramming/relearning of key(s) per manufacturer procedure
  9. Clear codes and retest vehicle multiple cycles (lock/unlock, start)
  10. If problem persists after keys and wiring verified, consider module fault — consult manufacturer guidance for module replacement or software update; follow security and programming procedures to program new module/keys

Likely causes

  • Weak/dead key fob battery or poor key battery contact
  • Unprogrammed or corrupt key transponder
  • Damaged key (physical or water damage)
  • Faulty immobiliser antenna/read coil or bad wiring/connectors

Fault status

⚠️ Status
Key/transponder recognition fault — vehicle may not start and remote/key functions may be disabled until key and immobiliser issue is resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

Similar codes

B1C38 B1C3A B1C3B B1790 B2760
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

B1C39

MITSUBISHI B — Body

DR.pretensioner circuit high

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

Causes

  • Key transponder damaged or missing
  • Key fob battery low or dead
  • Key not programmed or lost programming
  • Immobiliser/BCM (body control module) antenna or wiring fault
  • Connector corrosion or poor grounding at key reader or module
  • Software or module communication error between modules (BCM/PKM/ECU)

Symptoms

  • Engine will not start or crank due to immobiliser preventing start
  • Security/immobiliser warning lamp or message in instrument cluster
  • Remote locking/unlocking or panic functions intermittent or not working
  • ‘Key not recognised’ or ‘Key faulty’ message displayed
  • Intermittent starting problems that resolve when using a different key

What to check

  • Check owner manual messages and warning lamps for key/immobiliser alerts
  • Attempt to start using a known-good spare key
  • Check and replace key fob battery, verify contacts and remote buttons operate
  • Read all stored DTCs from body/immobiliser/engine modules with appropriate diagnostic tool
  • Inspect key for physical or water damage
  • Inspect antenna/read coil, connectors and wiring for corrosion, damage, or poor ground

Signal parameters

  • Immobiliser LF transponder field typically ~125 kHz (wake/read coil)
  • Key fob RF transmit frequency typical 315/433 MHz (region dependent)
  • Key reader/antenna coil resistance — compare to manufacturer specification (typical coil resistances vary by model)
  • Connector voltages: 12 V supply to immobiliser/key module and proper ground
  • CAN/LIN bus communication between BCM and engine/immobiliser module (normal message traffic expected)

Diagnostic algorithm

  1. Confirm symptom and record exact instrument cluster messages and conditions when fault occurs
  2. Try a spare programmed key. If spare works, suspect primary key transponder or key internal fault
  3. Replace or test key fob battery and retest remote functions
  4. Use a compatible diagnostic tool to read and record all related DTCs from body/immobiliser and engine modules
  5. Inspect and test immobiliser antenna/read coil resistance and continuity; compare to factory spec
  6. Inspect wiring and connector pins for corrosion, bent pins or poor mating; repair as required
  7. Verify power and ground at key reader/immobiliser module and check module communications on CAN/LIN network
  8. If antenna and wiring are OK, attempt reprogramming/relearning of key(s) per manufacturer procedure
  9. Clear codes and retest vehicle multiple cycles (lock/unlock, start)
  10. If problem persists after keys and wiring verified, consider module fault — consult manufacturer guidance for module replacement or software update; follow security and programming procedures to program new module/keys

Likely causes

  • Weak/dead key fob battery or poor key battery contact
  • Unprogrammed or corrupt key transponder
  • Damaged key (physical or water damage)
  • Faulty immobiliser antenna/read coil or bad wiring/connectors

Fault status

⚠️ Status
Key/transponder recognition fault — vehicle may not start and remote/key functions may be disabled until key and immobiliser issue is resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

Similar codes

B1C38 B1C3A B1C3B B1790 B2760
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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