What Does B2444 Mean?
B2444 indicates the airbag control module (ACM/SRS module) has detected an internal malfunction within the driver side impact/crash sensor. This sensor is designed to detect side-impact collisions and trigger appropriate safety restraint deployment. The fault is internal to the sensor itself, not a wiring or communication issue, suggesting component degradation or failure within the sensor's circuitry or accelerometer.
Safety Warning
This is a critical safety issue as the driver side airbag protection system may not function properly in a side-impact collision. The vehicle should not be driven until repaired, as occupant protection is compromised and the airbag warning light will remain illuminated indicating system malfunction.
Common Causes
50%
Failed driver side impact sensor due to internal component failure, moisture intrusion, or sensor degradation
25%
Corrosion or water damage to the sensor housing causing internal circuitry failure
15%
Previous impact or collision damage that compromised sensor integrity without triggering deployment
10%
Airbag control module misinterpreting sensor data due to ACM software corruption or module fault
Diagnostic Steps
1
Step 1: Perform visual inspection of driver side impact sensor location (typically in driver door or B-pillar) for obvious physical damage, water intrusion, connector corrosion, or collision evidence. Check connector integrity and terminal condition.
2
Step 2: Using a multimeter, measure voltage supply and ground at the sensor connector (typically 5V reference and ground). Compare readings to manufacturer specifications to verify power supply from ACM.
3
Step 3: Monitor live sensor data through advanced scan tool functions to observe if sensor is providing any output signal or if ACM reports continuous out-of-range values indicating internal sensor failure.
4
Step 4: Check for Technical Service Bulletins (TSBs) related to this sensor and verify if ACM software updates are available that address false internal fault detection.
5
Step 5: Replace driver side impact sensor with OEM or equivalent part, ensuring proper torque specifications and mounting orientation as sensors are directionally sensitive.
6
Step 6: Clear codes, perform SRS system relearn/initialization procedure, conduct test drive, and verify system operates without fault codes and airbag warning light remains off.
Estimated Repair Cost
$300 - $800
Parts + labor, varies by vehicle and location
B2444 indicates the airbag control module (ACM/SRS module) has detected an internal malfunction within the driver side impact/crash sensor. This sensor is designed to detect side-impact collisions and trigger appropriate safety restraint deployment. The fault is internal to the sensor itself, not a ...
The most common cause of B2444 (Driver Side Crash Sensor Internal Fault) is: Failed driver side impact sensor due to internal component failure, moisture intrusion, or sensor degradation
Typical repair costs for B2444 range from $300 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This is a critical safety issue as the driver side airbag protection system may not function properly in a side-impact collision. The vehicle should not be driven until repaired, as occupant protection is compromised and the airbag warning light will remain illuminated indicating system malfunction.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2444 to identify the root cause.
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Quick Info
Category
Body
System
Supplemental Restraint System (SRS/Airbag)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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