An eCall fault and the effect of changes to mobile networks
In this article
Which vehicles this advice applies to
Volkswagen Group vehicles equipped with emergency calling. The meaning of the indicator depends on the specific system. Network information checked on 10 November 2026.
What to do now
What to do until the fault is resolved
Until the fault has been checked and resolved, do not rely on the availability of the built-in emergency call function. In a real emergency, use an available telephone and call 112. From a safe place, explain what has happened and where you are, then follow the operator's instructions.
The system's operation needs to be checked using the prescribed diagnostics. Do not use the emergency line to test the SOS button.
What the symptom may mean
A steadily lit red indicator by the SOS button or an emergency call fault message requires professional inspection. Depending on the system, the built-in emergency call function may be unavailable. The indicator alone does not identify a faulty component.
A fault in the vehicle needs to be distinguished from a limitation of the mobile technology used by its emergency call system. Working internet access, radio or a mobile app does not, on its own, confirm that the built-in emergency call function is working correctly.
The full symptom and exact message matter
The meaning of colours and flashing patterns differs between systems. For the inspection, it is important to know whether the indicator is steadily lit or flashing, when it comes on and which message accompanies it. Follow the handbook for the specific vehicle.
Power supply and backup battery
Some systems have their own backup battery for temporary operation if the vehicle's power supply fails. Its condition may form part of the diagnostic checks. If a message appears after the vehicle battery has discharged or been disconnected, tell the workshop about the preceding circumstances too.
The power supply and the actual condition of the relevant system components need to be checked first. Depending on the design, communication, antenna connections, reception and control unit settings are also investigated. A red indicator alone is not a basis for automatically replacing a battery or the entire module.
How the closure of 2G and 3G networks affects the system
Older vehicle systems may need 2G or 3G networks for emergency calls. Closure dates differ by country and operator. The problem may therefore arise abroad before it does in the Czech Republic.
Czech 3G networks closed in 2021. According to information from the Czech Telecommunication Office (ČTÚ), checked on 10 November 2026, operators are required to retain 2G at least until the end of June 2028 unless an analysis confirms negligible demand earlier. Based on its published position, ČTÚ does not expect an earlier closure. June 2028 is therefore not an announced date for the nationwide closure of all Czech 2G networks.
What to tell the workshop
For a quicker discussion, have the VIN, current mileage and a brief description of the requested work or fault ready. We confirm the appointment and scope of work by agreement.
What to record before the inspection
| Observation | What to tell the workshop |
|---|---|
| Indicator and message | Whether the indicator is steadily lit or flashing, when it comes on and the exact wording of the message. |
| Previous power supply condition | Whether the vehicle battery was discharged, disconnected or recently replaced. |
| Location and recurrence | Whether the problem occurs all the time, only in a particular place or after entering another country. |
| Other functions | Whether online services or vehicle communication also fail to work. This is related information, not automatically the same fault. |
How the cause is checked
Support is checked for the specific vehicle
Emergency calling, manufacturer services and infotainment connectivity may use different technologies. The presence of LTE or working data transmission does not, on its own, confirm that the built-in emergency call function will continue to work after older networks close.
For some vehicles, the manufacturer offers an update to maintain selected online services. The availability of emergency calling and any possible solution need to be checked separately for the specific vehicle. An online services update does not, on its own, confirm continued eCall support. Software cannot add missing hardware support.
The Czech 112 emergency service has accepted the new generation of eCall since 1 January 2026. This uses more modern transmission over mobile networks. However, the readiness of the receiving centre does not, on its own, change an older vehicle's technical equipment.