Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / B11A5 — Band 3 antenna

B11A5 — Band 3 antenna

Detailed page for trouble code B11A5.

34,120codes
59brands
11,629generic
22,491specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
Reset
Code

B11A5

LAND ROVER B — Body

Band 3 antenna

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

Causes

  • Open or shorted coaxial antenna cable
  • Corroded or loose antenna connector
  • Failed active antenna (internal amplifier)
  • Faulty antenna module or telematics/infotainment control unit
  • Blown fuse or loss of bias voltage to an active antenna
  • Water ingress or physical damage to antenna or roof module

Symptoms

  • Reduced or no cellular/data signal for telematics, Wi‑Fi hotspot or connected services
  • Failure of remote services (vehicle tracking, remote start, SOS) or intermittent operation
  • Poor hands‑free call quality when using cellular network
  • Related infotainment features (navigation live traffic, streaming) unavailable or unreliable
  • Stored DTC B11A5 present in the body/telematics module

What to check

  • Read fault memory and freeze frame with a suitable Land Rover diagnostic tool; record related U-codes or B-codes
  • Visually inspect antenna assembly, roof module and cable routing for damage, water entry or corrosion
  • Check connectors for tightness and signs of corrosion or bent pins (antenna and module side)
  • Measure DC bias/supply voltage at the antenna connector if antenna is active (refer to vehicle wiring data)
  • Check continuity and resistance of coax cable (open/short tests); inspect for shorts to chassis
  • Verify fuses and power supplies for telematics/antenna amplifier

Signal parameters

  • Coax impedance: nominal 50 Ω (RF path)
  • DC bias: active antennas may require a bias supply (commonly 3.3–5 V) — verify vehicle-specific value
  • Continuity: coax inner conductor should not be open; typical DC resistance very low (near 0 Ω) if DC feed present
  • Short to ground: there should be no DC short from inner conductor to chassis
  • RF level: low or no RF carrier energy at antenna connector when module transmitting (requires RF test equipment)

Diagnostic algorithm

  1. Confirm DTC: Use a Land Rover-capable scan tool to confirm B11A5, note freeze-frame and any associated codes (U-codes, other B-codes).
  2. Reproduce/Observe: Verify reported symptoms (loss of connectivity, poor signal). Cycle ignition and re-scan to confirm persistent fault.
  3. Visual inspection: Check antenna, roof module, cable routing and connectors for damage, corrosion or water entry. Repair visible damage.
  4. Connector and pin check: Disconnect antenna connector(s), inspect and clean pins, then reseat. Clear code and retest.
  5. Power/bias check: With connector disconnected, measure presence and correct voltage of DC bias/power on feed pin(s) per wiring diagram. Replace fuse or repair supply if missing.
  6. Continuity test: Measure continuity of coax inner conductor and shield between antenna and the telematics module. Look for opens or shorts to chassis.
  7. Module input test: If wiring is good, measure RF activity or signal level at module antenna port with appropriate RF test equipment or substitute a known-good antenna if available.
  8. Swap/test: If possible, fit a known-good antenna or known-good telematics module to isolate which component is faulty.
  9. Software: Check for applicable software updates or module programming procedures that address antenna faults; reflash or reinitialise if required by manufacturer guidance.
  10. Replace/repair: Replace defective antenna, cable assembly, or telematics unit as required. After repair, clear DTCs and verify restoration of signal and services.

Likely causes

  • Damaged coax cable between roof antenna and telematics unit (open circuit)
  • Connector corrosion at antenna base or module connector
  • Failed powered (active) antenna due to loss of DC bias or internal failure
  • Intermittent connection from vibration or poorly seated connector
  • Module-level communication fault or internal antenna switch failure

Fault status

⚠️ Status
B11A5 — Band 3 antenna fault: the telematics/infotainment module reports a problem with the Band 3 (cellular) antenna circuit. May be caused by wiring, connector, antenna hardware, or module issues affecting mobile connectivity.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B11A4 B11A6 U1101 U0140 B12A1
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

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 .