U0453: Left Side Restraint Module Data Invalid
Diagnostic trouble code U0453 indicates that the primary control module (such as the PCM or BCM) has received invalid or erroneous data from the Left Side Restraints Control Module over the CAN bus. This communication fault means the data integrity from the left side airbag module does not meet expected parameters, typically due to electrical noise, interrupted data frames, or an internal fault in the transmitting module.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- Short or open circuit in the CAN bus wiring
- Poor connection or corroded terminals in the left side restraints module harness
- Lack of power or ground to the Left Side Restraints Control Module
- Electromagnetic interference (EMI) affecting the communication signal
- Faulty Left Side Restraints Control Module
- Internal failure in the receiving module (e.g., BCM or PCM)
3. Symptoms You Will Notice
- Airbag warning light illuminated
- Possible loss of side airbag functionality
4. Step-by-Step Diagnosis
Scan for all stored codes and freeze frame data
Inspect CAN bus wiring and connectors for damage, corrosion, or loose terminals
Check power and ground circuits at the Left Side Restraints Control Module
Test for EMI sources near the module or wiring
If wiring and power are OK, suspect a faulty module and replace if necessary
5. Frequently Asked Questions
Is it safe to drive?▼
No, it is not safe to drive because the side airbags may not deploy properly in a collision, increasing injury risk. Have the vehicle diagnosed and repaired immediately.
How much does it cost to fix?▼
Repair costs typically range from $150 to $600, depending on whether the issue is wiring repair or module replacement. Diagnostic fees are usually $100-$150.