U0175: Lost Communication With Restraints System Sensor F

What it means

A control module is not receiving expected messages from Restraints System Sensor F. The code indicates a communication fault; the sensor's specific role depends on the vehicle.

At a glance

• Usually lights the warning light of the system that lost communication

How it works

Restraints System Sensor F communicates restraint-related information to other vehicle modules, with its specific role depending on the vehicle. U0175 sets when a control module stops receiving the expected messages from Sensor F within the required time.

Common causes

Most likely first.

1. Sensor unpowered or wiring broken
2. Gateway module routing CAN messages incorrectly
3. CAN terminating resistor (120 Ω) drifted out of spec

Symptoms

• Airbag or restraint-system warning
• Restraint functions associated with the sensor may be impaired
• Other communication codes

How to diagnose it

1. Scan the restraint system and related modules for additional communication faults, and record when the warning or code first appeared.
2. Check battery and charging condition for a voltage problem that may have interrupted Sensor F communication.
3. Following the manufacturer's restraint-system safety procedure, inspect Sensor F’s connector and harness for loose, corroded, or damaged connections.
4. Verify power and ground at Sensor F using the manufacturer's specification.
5. If its supplies are good, test the CAN path and gateway routing, then assess Sensor F for failure.

Common fixes

• Repair a weak battery or poor battery connection.
• Secure Sensor F’s connector or repair its damaged wiring.
• Repair the power or ground circuit supplying Sensor F.
• Correct a CAN or gateway fault, or replace Sensor F if testing confirms it is faulty.

Can I keep driving?

Some restraint functions associated with Sensor F may not work while communication is lost. Keep driving to a minimum and arrange prompt diagnosis, using the required precautions around restraint-system wiring.