U0455: Invalid Data Received From Restraints Occupant Classification System Module

What it means

A receiving module detected implausible data from the restraints occupant classification system (OCS) module. Seat-weight or pressure-mat values fail plausibility checks; passenger airbag enable/disable may default to enabled with the warning lamp on.

At a glance

• Usually lights the warning light of the system that lost communication

How it works

The restraints occupant classification system module interprets passenger-seat weight or pressure data to help determine passenger-airbag status. U0455 is set when another module rejects that occupant-classification information as implausible; the passenger-airbag indicator or deployment decision may not reflect the occupant correctly.

Common causes

Most likely first.

1. Module internal fault or sensor input drift
2. Software version mismatch after replacement
3. Gateway module routing CAN messages incorrectly

Symptoms

• Multiple warning lights may illuminate
• Affected modules may go into limp mode or shut down
• Specific functions inoperative depending on module
• Diagnostic tools may show communication faults

How to diagnose it

1. Scan SRS and other modules for U0455 and related occupant-classification codes, and record freeze-frame data before clearing anything.
2. Check the passenger-airbag status indicator with the seat empty, then note whether it changes unexpectedly with a passenger seated.
3. Inspect the passenger seat for objects, covers, moisture, or damage that could affect its weight-sensing mat, and check accessible connectors and wiring for disturbance.
4. Use an SRS-capable scan tool to review occupant-classification readings and compare them with seat occupancy and status indicators.
5. If the seat, classification module, or another related module was recently replaced, verify required software configuration and calibration procedures with manufacturer information.
6. Follow the manufacturer's SRS procedure to test the seat sensor, classification module, and network; do not probe airbag igniter circuits with a standard meter.

Common fixes

• Remove objects or accessories from the passenger seat that interfere with occupant classification.
• Repair a damaged or loose occupant-classification connector or harness using the manufacturer's SRS procedure.
• Perform the manufacturer-specified configuration or calibration after relevant seat or module work.
• Repair or replace the seat sensing element or classification module if tests confirm a fault.

Can I keep driving?

Until diagnosed, the passenger airbag may not respond correctly to the occupant, so follow the vehicle's passenger-airbag indicator and manual and arrange prompt SRS service. Do not place a child restraint in a seat position the manufacturer says is unsuitable.