U0174 — Lost Communication With Restraints System Sensor E
OBD2 code U0174 flags a problem with the airbag / restraint system (SRS) (lost communication with restraints system sensor e). Short, gentle driving to a shop is usually possible. Common culprits: depleted backup battery or low system voltage, SRS control module fault or stored crash data, damaged wiring under seats or in the steering column.
vehicle network
Is it safe to drive?
Drive with caution The car drives normally, but with the SRS light on the airbags may not deploy in a crash. Treat it as a safety-critical repair: fine to drive to the shop, not fine to ignore for months.
How to diagnose with an OBD scanner
- Read the code and freeze frame Connect an OBD2 scanner, confirm U0174 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
- Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many U0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
- Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the airbag / restraint system (SRS) for damage, corrosion, chafing or poor contact.
- Subsystem check Read the SRS module with a scanner that supports airbag systems — generic OBD2 readers cannot see these codes.
- Subsystem check Inspect under-seat connectors — they are often disturbed by seat movement or cleaning.
- Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm U0174 does not return.
Approximate repair cost
Repair cost depends on which component actually failed. Typical scenarios for U0174 (parts and labor, USD, independent shop rates): Replace a sensor or clockspring: $150–$500; Reconnect or repair SRS wiring/connectors: $80–$250; SRS module reset or replacement: $300–$1,000. Overall, fixing U0174 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.
Common questions
How much does it cost to fix U0174?
Replace a sensor or clockspring — $150–$500; Reconnect or repair SRS wiring/connectors — $80–$250; SRS module reset or replacement — $300–$1,000. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.
What is the most common cause of U0174?
The most common causes are: depleted backup battery or low system voltage, SRS control module fault or stored crash data, damaged wiring under seats or in the steering column.
What are the symptoms of U0174?
Drivers most often notice: airbag (SRS) warning light on, no other driving symptoms, airbag system disabled message.
What does OBD2 code U0174 mean?
OBD2 code U0174 flags a problem with the airbag / restraint system (SRS) (lost communication with restraints system sensor e). Short, gentle driving to a shop is usually possible. Common culprits: depleted backup battery or low system voltage, SRS control module fault or stored crash data, damaged wiring under seats or in the steering column.
Is it safe to drive with U0174?
The car drives normally, but with the SRS light on the airbags may not deploy in a crash. Treat it as a safety-critical repair: fine to drive to the shop, not fine to ignore for months.
What does U0174 mean?
Behind U0174 is a specific failure in the airbag / restraint system (SRS): lost communication with restraints system sensor e. The onboard computer stores it in the vehicle network group after verifying the fault over repeated checks.
To set U0174, the control module compares live readings of the airbag / restraint system (SRS) against calibrated limits, usually over several drive cycles. Alongside the code it stores a freeze frame — a snapshot of rpm, load, coolant temperature and vehicle speed at the moment of failure. Reading that snapshot first saves diagnostic time.
What causes U0174?
- depleted backup battery or low system voltage
- failed clockspring (driver airbag circuit)
- SRS control module fault or stored crash data
- damaged wiring under seats or in the steering column
Common symptoms of U0174
- airbag (SRS) warning light on
- no other driving symptoms
- airbag system disabled message
How to diagnose U0174
- Connect an OBD2 scanner, confirm U0174 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
- Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many U0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
- Visually inspect the wiring harness and connectors related to the airbag / restraint system (SRS) for damage, corrosion, chafing or poor contact.
- Read the SRS module with a scanner that supports airbag systems — generic OBD2 readers cannot see these codes.
- Inspect under-seat connectors — they are often disturbed by seat movement or cleaning.
- Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm U0174 does not return.
How to fix U0174
Start with the cheapest and most common causes before replacing expensive parts:
- Replace a sensor or clockspring — $150–$500
- Reconnect or repair SRS wiring/connectors — $80–$250
- SRS module reset or replacement — $300–$1,000
How much does it cost to fix U0174?
Repair cost depends on which component actually failed. Typical scenarios for U0174 (parts and labor, USD, independent shop rates):
- Replace a sensor or clockspring: $150–$500
- Reconnect or repair SRS wiring/connectors: $80–$250
- SRS module reset or replacement: $300–$1,000
Overall, fixing U0174 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.
Can you drive with U0174?
The car drives normally, but with the SRS light on the airbags may not deploy in a crash. Treat it as a safety-critical repair: fine to drive to the shop, not fine to ignore for months.