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Home / DTC / B116E — SOS in the call lighting

B116E — SOS in the call lighting

Detailed page for trouble code B116E.

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Code

B116E

LAND ROVER B — Body

SOS in the call lighting

Brand: LAND ROVER
Type: B — Body
Views: UK: 9 EN: 20 RU: 17
AI status
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Page language: EN

Causes

  • Blown fuse or loss of power to the telematics/SOS module
  • Faulty telematics control unit (TCU) or SOS module
  • Poor or disconnected antenna or SIM card (cellular network)
  • Damaged wiring, poor ground or corroded connectors on telematics circuit
  • CAN/LIN comms fault between telematics module and instrument cluster/IVI
  • Software/firmware error or incomplete module programming

Symptoms

  • SOS / eCall indicator illuminated or flashing on instrument cluster
  • Inability to place an emergency (SOS) call or test call fails
  • Telematics/infotainment displays warning messages about SOS or connectivity
  • Related DTCs present in telematics or body control modules
  • Possible reduced cellular signal or no network registration for telematics module

What to check

  • Visual inspection: check telematics module mounting, connectors, antenna feed and SIM (if accessible) for damage or corrosion
  • Check relevant fuses and relays for continuity and correct rating
  • Measure vehicle battery voltage (engine off and cranking) — ensure adequate supply during tests
  • Scan telematics/BCM/IVI modules with OEM diagnostic tool; record B116E and any related codes and freeze-frame data
  • Check CAN/LIN network status and verify telematics module is communicating with other modules
  • Inspect antenna coax and connectors for continuity and shorts; check antenna ground

Signal parameters

  • Supply voltage to telematics module: nominal 9–16 V (engine running 13–14.5 V)
  • Ignition-switched supply present when ignition ON (check voltage at module pin)
  • Ground resistance at module chassis ground: ideally
  • Antenna continuity: low resistance end-to-end (manufacturer-specific; typically
  • Cellular RSSI / network registration: should show valid network and RSSI >= -100 dBm for reliable connection
  • CAN bus: correct bus voltage levels (~2.5 V idle differential), no bus errors / bus-off frames reported

Diagnostic algorithm

  1. Use OEM diagnostic tool to read and log all telematics and body module DTCs and freeze-frame data; note related communication codes.
  2. Check vehicle battery voltage; recharge or connect stable power if low. Confirm ignition-switched power to telematics module pins and verify ground continuity.
  3. Inspect and test fuses/relays for the telematics/SOS circuit; replace any blown fuses and retest.
  4. Visually inspect telematics module connectors, wiring harness, and antenna feed for damage, corrosion or loose connections; repair as needed.
  5. Test antenna continuity and check for short to chassis; verify antenna mounting and external damage. If removable SIM is used, verify SIM seated and active (follow manufacturer procedure).
  6. Verify CAN/LIN communication: check for bus errors, use scope if needed to confirm correct differential signals. Repair wiring or connectors if communication errors present.
  7. Check telematics module configuration and software level against latest manufacturer updates; re-flash or reprogram module if update or corruption suspected.
  8. If hardware tests and software reflash do not clear the fault, consider replacing the telematics/ SOS module per manufacturer procedure.
  9. Clear DTCs, perform SOS test function and full system verification (including network registration and test call) and road-test as required. Re-scan to confirm DTC does not return.

Likely causes

  • Fuse for telematics/SOS circuit blown or loose
  • Disconnected/poor antenna connection or damaged coax feed
  • TCU internal fault or failed SIM/telephony sub-module
  • CAN bus wiring open/short or high resistance ground in telematics circuit
  • Incomplete or corrupted telematics software calibration

Fault status

⚠️ Status
Telematics (SOS) system fault — SOS indicator illuminated; emergency call functionality may be impaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

B116A B116B B116C B116D B116F U0100
320

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