Lost Communication with Restraint Sensor F
Diagnostic trouble code U0175 indicates that the restraint system control module has lost communication with sensor 'F' over the vehicle's data network, typically the CAN bus or a dedicated airbag system network. This sensor provides impact or acceleration data used by the module to determine deployment strategy for passive safety devices; loss of this link can prevent or alter system operation in a collision. According to SAE J2012, this generic network DTC sets when the control module stops receiving valid messages from the sensor during an ignition cycle or a specific timeout period. The interruption may originate from the sensor side, the interconnecting wiring, or less commonly, the restraint system control module itself.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- Damaged, corroded, or disconnected wiring or connectors in the restraint sensor F circuit
- Short to ground, short to voltage, or open circuit in the communication or power supply lines of the sensor
- Internally failed restraint sensor F or network timing fault
- Intermittent or permanent fault in the airbag control module (SDM/RCM)
- Communication network termination issues or electromagnetic interference affecting data transmission
3. Symptoms You Will Notice
- Airbag warning light illuminated on the dashboard
- Restraint system malfunction message displayed
4. Step-by-Step Diagnosis
Scan for all stored codes and freeze frame data to confirm U0175 and related codes.
Visually inspect the wiring and connectors for sensor F, looking for damage, corrosion, or loose connections.
Test the communication and power supply circuits for shorts, opens, or excessive resistance using a multimeter.
Check for network termination and signal integrity with an oscilloscope if available.
If wiring is intact, attempt to communicate with sensor F using a scan tool; if no response, replace the sensor.
If sensor responds but code persists, suspect the airbag control module and test or replace it.
5. Frequently Asked Questions
Is it safe to drive?▼
No, it is not safe to drive. The airbag system may not deploy properly in a crash, increasing the risk of injury. Have the vehicle towed to a repair shop.
How much does it cost to fix?▼
Repair costs typically range from $150 to $600, depending on whether the issue is a simple wiring repair or requires replacing a sensor or control module.