What Does B009C Mean?
This code indicates the Restraint Control Module (RCM) has detected a fault condition in the left side restraints sensor number 6, which is typically a side impact sensor, pressure sensor, or occupant classification sensor. The subfault designation means a secondary or internal fault within that specific sensor circuit has been identified. This affects the supplemental restraint system (SRS/airbag system) and may prevent proper deployment or disable certain airbags in a collision.
Safety Warning
This is a critical safety system fault that may prevent proper airbag deployment in a collision, particularly side-impact airbags. The vehicle should be repaired immediately before driving, as occupant protection is compromised and the airbag warning light will remain illuminated.
Common Causes
45%
Faulty left side restraints sensor 6 (internal sensor failure or calibration drift)
30%
Damaged or corroded wiring harness or connector to left side sensor 6
15%
Water intrusion or moisture contamination in sensor or connector
10%
Restraint Control Module (RCM) internal fault or programming issue
Diagnostic Steps
1
Step 1: Perform visual inspection of left side restraints sensor 6 location (typically B-pillar, door, or seat-mounted depending on vehicle) for physical damage, corrosion, or water intrusion. Check connector security and pin condition.
2
Step 2: Using a digital multimeter, check sensor power supply voltage (typically 5V reference) and ground circuits at the sensor connector with ignition on. Verify voltage is within 4.5-5.5V and ground resistance is below 1 ohm.
3
Step 3: Measure sensor signal circuit resistance and compare to manufacturer specifications (typically 2-10 kohms depending on sensor type). Check for open circuits, short to ground, or short to power in the wiring harness between sensor and RCM.
4
Step 4: If wiring and power supply are correct, check for sensor-specific subfault data using advanced scan tool functions or manufacturer-specific diagnostic software to identify internal sensor calibration or component failures.
5
Step 5: If all circuits test normal, replace the left side restraints sensor 6 and clear codes. If code returns immediately, suspect RCM internal fault. Perform RCM self-test and verify proper sensor communication.
6
Step 6: After repair, clear all SRS codes, perform complete system relearn/calibration procedure as required by manufacturer, and verify proper system operation with test drive and code re-scan.
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
This code indicates the Restraint Control Module (RCM) has detected a fault condition in the left side restraints sensor number 6, which is typically a side impact sensor, pressure sensor, or occupant classification sensor. The subfault designation means a secondary or internal fault within that spe...
The most common cause of B009C (Left Side Restraints Sensor 6 (Subfault)) is: Faulty left side restraints sensor 6 (internal sensor failure or calibration drift)
Typical repair costs for B009C range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This is a critical safety system fault that may prevent proper airbag deployment in a collision, particularly side-impact airbags. The vehicle should be repaired immediately before driving, as occupant protection is compromised and the airbag warning light will remain illuminated.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B009C to identify the root cause.
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Quick Info
Category
Body
System
Supplemental Restraint System (SRS/Airbag System)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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