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DTC codes / U01xx · Lost communication with a control module / U0175

U0175Lost Communication With 'Restraints System Sensor F'

U0175 is a generic network communication code indicating that a control module on the vehicle's Controller Area Network (CAN) bus has lost contact with the restraints system sensor designated as 'F'. The computer has detected that expected messages from this sensor are missing for a calibrated period, which can disable or degrade the airbag and seatbelt restraint functions.

SystemNetwork
Code typeGeneric (all makes)
SeverityHigh
Fix difficultyProfessional
AreaLost communication with a control module

Symptoms you may notice

  • Airbag warning light illuminated on the instrument cluster
  • Seatbelt reminder light may flash or stay on continuously
  • Passenger airbag indicator may show 'off' or 'disabled' regardless of seat occupancy
  • Restraint system may be completely disabled, offering no protection in a crash
  • Often no symptoms besides the warning light, with the vehicle driving normally
  • In some vehicles, a chime or message center alert appears for the restraint system

Common causes, most likely first

  1. Damaged or corroded wiring harness at the restraints system sensor F connector
  2. Failed restraints system sensor F itself (open or shorted internally)
  3. Loose or backed-out terminal pins in the sensor or module connector
  4. Water intrusion or corrosion in the connector or sensor mounting area
  5. Faulty restraints control module (RCM) not communicating properly on the bus
  6. CAN bus wiring fault (open, short to ground, or short to power) between the sensor and the module
  7. Low battery voltage or poor ground connection affecting module communication

How to diagnose and fix it

  1. Verify battery voltage and charge the battery if low, then clear the code and retest
  2. Inspect the restraints system sensor F connector for corrosion, loose pins, or damage
  3. Check the wiring harness between the sensor and the restraints control module for continuity and shorts
  4. Perform a wiggle test on the harness and connectors while monitoring live data for sensor F communication
  5. Substitute a known-good sensor F if wiring checks pass, then clear codes and retest
  6. Check for technical service bulletins (TSBs) or software updates for the restraints control module
  7. If all else fails, diagnose the CAN bus integrity and replace the restraints control module if faulty

When the sensor is not the real culprit

  • A loose or corroded connector at the sensor is far more common than a failed sensor, especially on vehicles with prior seat or trim removal.
  • The code can set intermittently due to vibration or temperature changes, so a single clear-and-retest may not reveal the fault.
  • Water leaks into the cabin or trunk can corrode restraint system connectors, causing communication loss that mimics a sensor failure.
  • Some vehicles require reprogramming the restraints control module after sensor replacement, and skipping this step can leave the code stored.
  • U0175 can be a secondary code triggered by a low-voltage event, so always check for other low-voltage or communication codes first.

Can I keep driving with U0175?

The vehicle may be safe to drive if only the warning light is on and no other restraint faults are present, but the airbag system may not deploy in a crash. Avoid driving until the fault is diagnosed, especially if the seatbelt reminder or passenger airbag indicator is also abnormal.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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