U0178: Lost Communication With Restraints System Sensor I
CriticalNetwork/CommunicationCommunication Bus
What does U0178 mean?
U0178 is a diagnostic trouble code indicating "Lost Communication With Restraints System Sensor I". The vehicle's main computer has lost its ability to communicate with a specific module over the data bus. This could be caused by a wiring fault, a blown fuse, or a failed control module.
Common causes
- Failed control module
- CAN bus wiring fault or short
- Blown fuse to the affected module
- Water intrusion in a connector or module
- Battery voltage too low
What should you do?
This is a critical issue. Stop driving as soon as it is safe to do so and have the vehicle inspected immediately. Continuing to drive could cause further damage or pose a safety risk.
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Code U0178 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.