What are the common causes of U0477?

A Restraints System Sensor G that has drifted out of calibration. Water intrusion or heat damage at the Restraints System Sensor G. A worn sensing element inside the Restraints System Sensor G. A contaminated sensing element inside the Restraints System Sensor G.

Pull all module codes with a scan tool. Check the Restraints System Sensor G connector for water, corrosion, or loose pins. Test the Restraints System Sensor G wiring for open and short faults. Replace the Restraints System Sensor G if the wiring and voltage tests pass. Clear the code and retest.

U0477

Invalid Data Received From Restraints System Sensor G

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

What it means

U0477 means Invalid Data Received From Restraints System Sensor G.

Where it lives

For U0477, start at the sensor the description names.

Check these first

A Restraints System Sensor G that has drifted out of calibration
Water intrusion or heat damage at the Restraints System Sensor G
A worn sensing element inside the Restraints System Sensor G
A contaminated sensing element inside the Restraints System Sensor G

What to do next

Pull all module codes with a scan tool
Check the Restraints System Sensor G connector for water, corrosion, or loose pins
Test the Restraints System Sensor G wiring for open and short faults
Replace the Restraints System Sensor G if the wiring and voltage tests pass
Clear the code and retest

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Updated

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