What does it mean?
U1176 is a Network (CAN bus, module communications) fault code. It indicates: Lost Communication With Emergency Alert Module .
Symptoms
- Emergency call button lit red or showing a fault indication
- A message on the display that the emergency call system is not available
- Connected services and related telematics features not working
- The module is unreachable with the scan tool while other modules answer normally
- Occasional battery drain if the module keeps waking the network
- The fault often follows an accident repair, a flat battery or work in the boot area
Likely causes
- Blown fuse or an open power feed to the emergency alert module
- Degraded or dead backup battery inside the module, which many of these units use so they can still call after a crash
- Corroded or wet connector at the module, which is often mounted under a seat, behind trim or in the boot area
- Damaged antenna lead or antenna connector
- Open or shorted bus wiring between the module and the gateway or body control module
- Module deactivated, incorrectly coded or replaced without configuration
- Internal module failure after water ingress or an impact
How to fix it
- Scan all modules and note whether the emergency alert module is the only one missing
- Check the module fuse and measure supply voltage and ground at its connector under load
- Remove the trim and inspect the module, connector and surrounding area for water marks and corrosion
- Check the condition and age of the module backup battery, since a failed cell often takes the module offline
- Inspect the antenna lead and its connector for damage or disconnection
- Test the bus wiring from the module to the gateway for opens and shorts
- Replace or reconfigure the module last, following the correct coding and activation procedure, and dispose of the backup battery safely