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U0471 — Invalid Data Received From Restraints System Sensor

Generic OBD-II · all makesNetwork / communication

The U0471 code indicates that a control module (often the Restraints Control Module or Occupant Classification Module) has received invalid or implausible data from a restraints system sensor, such as a seat weight sensor, seat position sensor, or crash sensor. This typically points to a communication error or sensor malfunction rather than a wiring fault.

Symptoms

What causes it — most likely first

1. Faulty restraints system sensor

The sensor itself (e.g., seat weight sensor, seat position sensor, or crash sensor) is defective, sending invalid or out-of-range data to the module.

2. Damaged or corroded sensor wiring/connectors

Wiring harness issues, loose connections, or corrosion at the sensor or module connectors can corrupt the data signal.

3. Poor electrical ground or power supply to sensor

A weak ground or intermittent power to the sensor can cause erratic data transmission, triggering the code.

4. Faulty restraints control module (RCM) or occupant classification module (OCM)

The module receiving the data may have an internal fault, misinterpreting valid sensor signals.

5. Software incompatibility or calibration error

After a module replacement or update, incorrect programming or failure to perform a required calibration can lead to invalid data being reported.

6. Faulty engine control module (PCM) or other receiving module

Rarely, the module that set the code (often the PCM) has an internal communication error, but this is the least likely cause and should only be considered after all other possibilities are ruled out.

How it's diagnosed

  1. Scan all modules for additional codes, especially in the restraints system, to identify the specific sensor or module reporting invalid data.
  2. Visually inspect the wiring and connectors at the suspect sensor and the restraints control module for damage, corrosion, or loose pins.
  3. Check power and ground circuits to the sensor and module using a digital multimeter, verifying proper voltage and low resistance.
  4. Use a scan tool to view live data from the suspect sensor; compare readings to specifications (e.g., seat weight sensor voltage with seat empty and occupied).
  5. Perform a network test to verify communication between the restraints module and other modules on the CAN bus.
  6. If no wiring or power issues are found, replace the suspect sensor and perform any required calibration or relearn procedures.

Code facts & related codes

SystemNetwork / communication
StandardizationSAE generic — identical on every make
Related codesU0469 — Invalid Data Received From Starter GenU0472 — Invalid Data Received From Restraints U0473 — Invalid Data Received From Restraints U0474 — Invalid Data Received From Restraints U0475 — Invalid Data Received From Restraints U0476 — Invalid Data Received From Restraints

Frequently asked

Can I drive with a U0471 code?

The vehicle may be drivable, but the restraints system may be disabled, meaning airbags or seat belt pretensioners might not deploy in a crash. This is a serious safety risk, and the code should be diagnosed and repaired promptly.

Is the PCM the most likely cause of U0471?

No. While the PCM may store the code, it is almost never the root cause. The fault is typically in the restraints sensor, its wiring, or the restraints control module. Replacing the PCM without proper diagnosis is a common misstep and will not fix the issue.

Do I need to replace the entire seat if the seat weight sensor fails?

Not necessarily. Many seat weight sensors (also called occupant classification sensors) are serviceable separately from the seat frame or cushion. However, some are integrated and may require seat component replacement. Proper diagnosis will determine the exact part needed.

Will clearing the code fix the problem?

Clearing the code will turn off the warning light temporarily, but the underlying fault will remain. The code will return as soon as the module runs its self-test and detects the invalid data again.