U0179
Lost Communication With Restraints System Sensor J
Network / communication
Generic OBD-II
High
What it means
U0179 sets when the airbag/restraints system loses communication with restraints system sensor J, a crash or occupant sensor on the network. This is a safety fault: the SRS warning light comes on and the airbags or pretensioners tied to that sensor may not deploy correctly in a crash. Have it fixed right away.
High
Can I keep driving? The car drives, but the airbag system is compromised — the affected restraints may not deploy in a crash, so treat it as urgent and get it fixed right away.
Common symptoms
What you'll notice
- Airbag / SRS warning light on
- Restraints sensor J missing from a scan tool
- Possible flashing airbag indicator
- Companion restraint-system codes stored
Common causes
Most likely first
- Damaged or corroded wiring/connector at the sensorLikely
- Lost power or ground to the sensorCommon
- Restraints/CAN bus fault to the sensorCommon
- Failed restraints sensorLess often
- Water intrusion or prior crash damage in the sensor areaLess often
How to diagnose & fix
Work through it in order
- Scan the SRS system and record all restraint codes before clearing anything.
- Inspect the sensor's connector and wiring for damage, corrosion, or a disturbed plug.
- Check power and ground to the sensor.
- Verify the restraints bus wiring to the sensor for continuity.
- If wiring and supply are good, the sensor is likely faulty; SRS work should be done carefully or by a professional.
FAQ
Quick answers
Is it safe to drive with U0179?+
The car moves normally, but the affected airbags or pretensioners may not work in a crash. Treat it as urgent and get the SRS repaired quickly.
Can I just clear U0179?+
No — clearing it doesn't restore the sensor, and the SRS light will return. The restraint system must be properly repaired.
Related codes
Often seen with U0179
Read & clear U0179 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX