Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / B1B02 — Low-frequency coil

B1B02 — Low-frequency coil

Detailed page for trouble code B1B02.

34,405codes
59brands
11,914generic
22,491specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
Reset
Code

B1B02

LAND ROVER B — Body

Low-frequency coil

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

Causes

  • Open or shorted low-frequency coil (antenna)
  • Corroded, loose or damaged connector or wiring harness
  • Poor ground or supply voltage to coil/module
  • Water ingress or physical damage to coil or antenna assembly
  • Faulty body control/immobiliser module or software fault
  • Electromagnetic interference or improper coil alignment/mounting

Symptoms

  • Passive entry, keyless entry or immobiliser may not detect key fob reliably
  • Intermittent or complete loss of remote locking/unlocking or push-button start operation
  • Security/immobiliser warning message or lamp illuminated
  • Inconsistent vehicle lock/unlock range or only works when fob very close to vehicle
  • No additional drivetrain fault codes but body electronics behave erratically

What to check

  • Read and record all stored and pending codes with a compatible scan tool
  • Perform a visual inspection of the LF coil/antenna, connectors and harness for corrosion, damage or water ingress
  • Inspect connector terminals for bent or pushed-out pins and for proper mating
  • Verify battery voltage and ground quality at the body control module (BCM) with engine off/on as specified
  • Wiggle test wiring and connectors while monitoring live data or checking for code changes
  • If accessible, check coil mounting and ensure it is correctly positioned and not shielding/interfered with

Signal parameters

  • Refer to manufacturer service manual for exact LF coil specifications
  • Typical LF systems operate around ~125 kHz (manufacturer dependent) — verify with service data
  • Measure DC resistance/impedance of coil and compare to specification (use ohmmeter or LCR meter)
  • Check for stable supply voltage to coil connector (per service data) and good ground continuity

Diagnostic algorithm

  1. Verify the code is current and note freeze-frame/live-data if available. Clear codes and re-scan to confirm repeatability.
  2. Visually inspect coil/antenna, mount area and wiring for damage, water entry, or corrosion. Repair any obvious issues.
  3. Confirm correct supply voltage and ground at the coil connector and at the BCM per factory values.
  4. Measure coil DC resistance/impedance and compare to manufacturer specification. Replace coil if out of spec.
  5. Check continuity between coil connector and BCM pins; repair any open/short circuits in the harness.
  6. Swap or bench-test coil (if spare or known-good unit available) to confirm component failure.
  7. If wiring and coil are good, check BCM operation and software level; perform any available module tests or reprogramming as specified by the manufacturer.
  8. After repairs, clear codes and perform functional test of passive entry/immobiliser system to verify resolution.

Likely causes

  • Broken or shorted coil winding
  • Connector pins corroded or bent at the coil assembly
  • Wire chafe or broken conductor in harness between coil and module
  • Loose or corroded ground/supply at module
  • Module reporting error due to firmware or internal failure

Fault status

⚠️ Status
Control module has detected a fault in the low-frequency coil/antenna circuit (open/short/high resistance or intermittent). Inspection and electrical testing of the coil, connectors, wiring and module are required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.0 hours

Similar codes

B1B01 B1B03 B1B04 B2780 U0140
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

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

B1B02

MITSUBISHI B — Body

DR.ABG squib(1) open

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

Causes

  • Open or shorted low-frequency coil (antenna)
  • Corroded, loose or damaged connector or wiring harness
  • Poor ground or supply voltage to coil/module
  • Water ingress or physical damage to coil or antenna assembly
  • Faulty body control/immobiliser module or software fault
  • Electromagnetic interference or improper coil alignment/mounting

Symptoms

  • Passive entry, keyless entry or immobiliser may not detect key fob reliably
  • Intermittent or complete loss of remote locking/unlocking or push-button start operation
  • Security/immobiliser warning message or lamp illuminated
  • Inconsistent vehicle lock/unlock range or only works when fob very close to vehicle
  • No additional drivetrain fault codes but body electronics behave erratically

What to check

  • Read and record all stored and pending codes with a compatible scan tool
  • Perform a visual inspection of the LF coil/antenna, connectors and harness for corrosion, damage or water ingress
  • Inspect connector terminals for bent or pushed-out pins and for proper mating
  • Verify battery voltage and ground quality at the body control module (BCM) with engine off/on as specified
  • Wiggle test wiring and connectors while monitoring live data or checking for code changes
  • If accessible, check coil mounting and ensure it is correctly positioned and not shielding/interfered with

Signal parameters

  • Refer to manufacturer service manual for exact LF coil specifications
  • Typical LF systems operate around ~125 kHz (manufacturer dependent) — verify with service data
  • Measure DC resistance/impedance of coil and compare to specification (use ohmmeter or LCR meter)
  • Check for stable supply voltage to coil connector (per service data) and good ground continuity

Diagnostic algorithm

  1. Verify the code is current and note freeze-frame/live-data if available. Clear codes and re-scan to confirm repeatability.
  2. Visually inspect coil/antenna, mount area and wiring for damage, water entry, or corrosion. Repair any obvious issues.
  3. Confirm correct supply voltage and ground at the coil connector and at the BCM per factory values.
  4. Measure coil DC resistance/impedance and compare to manufacturer specification. Replace coil if out of spec.
  5. Check continuity between coil connector and BCM pins; repair any open/short circuits in the harness.
  6. Swap or bench-test coil (if spare or known-good unit available) to confirm component failure.
  7. If wiring and coil are good, check BCM operation and software level; perform any available module tests or reprogramming as specified by the manufacturer.
  8. After repairs, clear codes and perform functional test of passive entry/immobiliser system to verify resolution.

Likely causes

  • Broken or shorted coil winding
  • Connector pins corroded or bent at the coil assembly
  • Wire chafe or broken conductor in harness between coil and module
  • Loose or corroded ground/supply at module
  • Module reporting error due to firmware or internal failure

Fault status

⚠️ Status
Control module has detected a fault in the low-frequency coil/antenna circuit (open/short/high resistance or intermittent). Inspection and electrical testing of the coil, connectors, wiring and module are required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.0 hours

Similar codes

B1B01 B1B03 B1B04 B2780 U0140
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

Report

Harassment or bullying behavior
Contains mature or sensitive content
Contains misleading or false information
Contains abusive or derogatory content
Contains spam, fake content or potential malware

Block Member?

Please confirm you want to block this member.

You will no longer be able to:

  • See blocked member's posts
  • Mention this member in posts
  • Invite this member to groups
  • Message this member
  • Add this member as a connection

Please note: This action will also remove this member from your connections and send a report to the site admin. Please allow a few minutes for this process to complete.

Report

You have already reported this .