What are the common causes of U0179?

Damaged wiring between restraints sensor J and the control module. A failed restraints system sensor J. Corrosion in the sensor J connector. A module that no longer reads sensor J on the bus. A software or calibration fault in the restraints module.

Inspect the wiring and connector at restraints sensor J. Check for corrosion or water in the sensor J harness. Confirm the restraints module sees sensor J on a scan tool. Test the sensor J signal against the manufacturer spec. Replace restraints sensor J if the signal is missing. Clear the code and retest.

U0179

Lost Communication With Restraints System Sensor J

System: Network communication (U code)
Lamp: Check Engine Light
Category: Network Communications

What it means

U0179 means Lost Communication With Restraints System Sensor J.

Where it lives

For U0179, start at the sensor the description names.

Check these first

Damaged wiring between restraints sensor J and the control module
A failed restraints system sensor J
Corrosion in the sensor J connector
A module that no longer reads sensor J on the bus
A software or calibration fault in the restraints module

What to do next

Inspect the wiring and connector at restraints sensor J
Check for corrosion or water in the sensor J harness
Confirm the restraints module sees sensor J on a scan tool
Test the sensor J signal against the manufacturer spec
Replace restraints sensor J if the signal is missing
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.