U0172: Lost Communication With Restraints System Sensor C
What Does U0172 Mean?
U0172 is a diagnostic trouble code indicating: Lost Communication With Restraints System Sensor C. This code relates to the network communication system. It has been reported in NHTSA complaints across 1 different vehicle models.
Symptoms of U0172
- ⚠️ Airbag warning light on
Common Causes
- 🔍 Failed or deteriorated catalytic converter
- 🔍 Sensor or control module malfunction
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"I have power door locks not working except manually or driver door by key. Key fob and door module for locks will not function. I cannot open the hatch due to power lock function. The Airbag light comes on when vehicle is started and the door is open and only disappears after the door is closed, eng"
— Dodge Journey owner, 12/22/2021
Source: NHTSA Complaints Database
Most Reported Vehicles for U0172
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | DODGE JOURNEY |
Frequently Asked Questions
What causes communication codes?
Can a bad battery cause network codes?
What To Do Next
Possible Fixes
- 🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
- 🔧 Test the relevant sensor(s) with a multimeter before replacing
- 🔧 Check battery voltage and ground connections; inspect CAN bus wiring
- 🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.