U0134
Lost Communication with Restraints System Sensor (Side Sensor)
The airbag control module has stopped receiving data from a side impact sensor. Airbag warning lamp lights up; restraint deployment for side and curtain bags may be inhibited.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: hard
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Common causes
Ordered by how often each turns out to be the cause.
- Side impact sensor failedPossible
- Wiring damage in door or B-pillarPossible
- Gateway module routing CAN messages incorrectlyLess likely
Parts involved
- Side Impact Sensor
- Airbag Module
- Sensor Wiring
U0134 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.