What Does U0173 Mean?
Communication failure between the airbag control module and restraint system sensor D has occurred. The control module cannot receive crash detection data from this sensor location, disabling proper system function.
Safety Warning
Critical safety system failure that prevents proper airbag deployment. Vehicle should not be driven as occupant protection is compromised in collision scenarios.
Common Causes
35%
Malfunctioning impact sensor D with degraded internal electronics or water ingress
30%
Damaged wiring harness or connector issues between sensor D and airbag module
20%
Ground circuit failure at sensor D mounting point or harness ground splice
10%
CAN bus communication line fault (open, short, or excessive resistance)
5%
Airbag control module communication circuit defect or processor failure
Diagnostic Steps
1
Step 1: Locate sensor D using factory service information and perform visual inspection of sensor, connector, and mounting for physical damage or corrosion
2
Step 2: Verify 5V reference voltage at sensor D connector and test ground circuit continuity to chassis (should be less than 1 ohm)
3
Step 3: Check CAN bus communication lines using multimeter for proper resistance values and absence of shorts to power or ground
4
Step 4: Inspect wiring harness routing from sensor D to control module for pinch points, chafing against sharp edges, or damage from road debris
5
Step 5: Monitor sensor D communication in live data while manipulating connector and harness; replace sensor if circuits test good
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
Communication failure between the airbag control module and restraint system sensor D has occurred. The control module cannot receive crash detection data from this sensor location, disabling proper system function.
The most common cause of U0173 (Lost Communication With Restraints System Sensor D) is: Malfunctioning impact sensor D with degraded internal electronics or water ingress
Typical repair costs for U0173 range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Critical safety system failure that prevents proper airbag deployment. Vehicle should not be driven as occupant protection is compromised in collision scenarios.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0173 to identify the root cause.
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Quick Info
Category
Network
System
Supplemental Restraint System (SRS/Airbag)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
