What Does U017C Mean?
The restraints control module has lost communication with restraint system sensor M, typically a satellite crash sensor or occupant classification sensor. This indicates a breakdown in the CAN bus network communication between the airbag control module and a specific sensor module.
Safety Warning
Airbag system may not deploy properly or at all in a collision. Vehicle may disable certain airbags or entire restraint system as a safety precaution.
Common Causes
35%
Damaged wiring harness or corroded connector to sensor M location
30%
Failed restraint sensor M module
20%
Poor ground connection at sensor M mounting location
10%
Water intrusion or physical damage to sensor M
5%
Airbag control module internal fault
Diagnostic Steps
1
Step 1: Locate restraint sensor M position using service manual (typically front or side impact sensor)
2
Step 2: Visually inspect sensor M, connector, and wiring for physical damage, corrosion, or water intrusion
3
Step 3: Check connector terminals for proper seating, bent pins, and corrosion; clean and reseat as needed
4
Step 4: Measure voltage supply and ground at sensor M connector with multimeter (typically 5V reference)
5
Step 5: Test communication circuit continuity and resistance between sensor M and airbag control module; check for shorts to ground or power
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The restraints control module has lost communication with restraint system sensor M, typically a satellite crash sensor or occupant classification sensor. This indicates a breakdown in the CAN bus network communication between the airbag control module and a specific sensor module.
The most common cause of U017C (Lost Communication With "Restraints System Sensor M") is: Damaged wiring harness or corroded connector to sensor M location
Typical repair costs for U017C range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Airbag system may not deploy properly or at all in a collision. Vehicle may disable certain airbags or entire restraint system as a safety precaution.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U017C to identify the root cause.
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Quick Info
Category
Network
System
Restraints/Airbag System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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