U047C — Invalid Data Received From "Restraints System Sensor L"

OBD2 code U047C flags a problem with the airbag / restraint system (SRS) (invalid data received from "restraints system sensor L"). Short, gentle driving to a shop is usually possible. Common culprits: depleted backup battery or low system voltage, damaged wiring under seats or in the steering column, SRS control module fault or stored crash data.

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

  1. Read the code and freeze frame Connect an OBD2 scanner, confirm U047C is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. 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.
  3. 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.
  4. Subsystem check Read the SRS module with a scanner that supports airbag systems — generic OBD2 readers cannot see these codes.
  5. Subsystem check Inspect under-seat connectors — they are often disturbed by seat movement or cleaning.
  6. Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm U047C does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for U047C (parts and labor, USD, independent shop rates): Replace a sensor or clockspring: $150–$500; SRS module reset or replacement: $300–$1,000; Reconnect or repair SRS wiring/connectors: $80–$250. Overall, fixing U047C 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

What are the symptoms of U047C?

Drivers most often notice: no other driving symptoms, airbag system disabled message, airbag (SRS) warning light on.

How do I diagnose U047C myself?

Start with a scan: confirm U047C, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the airbag / restraint system (SRS), and verify the suspect component against live data before buying parts.

How much does it cost to fix U047C?

Replace a sensor or clockspring — $150–$500; SRS module reset or replacement — $300–$1,000; Reconnect or repair SRS wiring/connectors — $80–$250. 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 U047C?

The most common causes are: depleted backup battery or low system voltage, damaged wiring under seats or in the steering column, SRS control module fault or stored crash data.

Will U047C clear itself?

Sometimes U047C clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What does U047C mean?

When U047C appears on a scan, it means the control module has flagged a problem in the airbag / restraint system (SRS): invalid data received from "restraints system sensor L". The fault sits in the vehicle network group of the OBD2 standard.

The module monitors this system continuously while driving. When readings fall outside the expected range for a defined number of drive cycles, it stores U047C and switches on the warning light. Freeze frame data saved with the code shows the exact conditions — rpm, load, temperature, speed — at the moment the fault was detected, which is the best starting point for diagnosis.

Common symptoms of U047C

  • no other driving symptoms
  • airbag system disabled message
  • airbag (SRS) warning light on

What causes U047C?

  • SRS control module fault or stored crash data
  • faulty impact or occupancy sensor
  • failed clockspring (driver airbag circuit)
  • depleted backup battery or low system voltage
  • damaged wiring under seats or in the steering column

How to diagnose U047C

  1. Connect an OBD2 scanner, confirm U047C is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. 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.
  3. Visually inspect the wiring harness and connectors related to the airbag / restraint system (SRS) for damage, corrosion, chafing or poor contact.
  4. Read the SRS module with a scanner that supports airbag systems — generic OBD2 readers cannot see these codes.
  5. Inspect under-seat connectors — they are often disturbed by seat movement or cleaning.
  6. Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm U047C does not return.

How to fix U047C

Start with the cheapest and most common causes before replacing expensive parts:

  • Replace a sensor or clockspring — $150–$500
  • SRS module reset or replacement — $300–$1,000
  • Reconnect or repair SRS wiring/connectors — $80–$250

How much does it cost to fix U047C?

Repair cost depends on which component actually failed. Typical scenarios for U047C (parts and labor, USD, independent shop rates):

  • Replace a sensor or clockspring: $150–$500
  • SRS module reset or replacement: $300–$1,000
  • Reconnect or repair SRS wiring/connectors: $80–$250

Overall, fixing U047C 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 U047C?

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.

Related OBD2 codes