What it means
A control module is not receiving expected messages from Restraints System Sensor E. 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 E sends restraint-related information to other vehicle modules, but its precise role and network arrangement vary by vehicle. U0174 sets when a control module does not receive the expected messages from Sensor E within the required time.
Common causes
Most likely first.
- Sensor unpowered or wiring broken
- Gateway module routing CAN messages incorrectly
- 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
- Scan the restraint and other modules for communication codes, and note whether the airbag warning or other faults appeared at the same time.
- Check battery condition and available event data for a low-voltage interruption.
- Using the manufacturer's restraint-system safety procedure, inspect Sensor E’s connector and wiring for damage, corrosion, or looseness.
- Check Sensor E’s power and ground according to the manufacturer's specification.
- If those circuits are sound, test CAN communication and gateway routing before deciding whether Sensor E has failed.
Common fixes
- Correct a weak battery or poor battery connection if voltage is low.
- Reconnect Sensor E or repair damaged wiring at its connector.
- Restore the sensor’s power or ground supply.
- Repair a CAN or gateway routing fault, or replace Sensor E if testing isolates the fault to it.
Can I keep driving?
The restraint warning indicates that functions associated with Sensor E may be impaired, and other restraint functions could also be affected. Limit driving and arrange prompt diagnosis; follow the manufacturer's safety procedure when working near restraint components.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.