SRS Frontal Impact Sensor Circuit -- Left
What does B0030 mean?
The B0030 code means the vehicle's onboard diagnostic system has detected: SRS Frontal Impact Sensor Circuit -- Left. This is a critical severity code.
Common Symptoms
- Airbag warning light on
- SRS system fault stored
- Impact sensor malfunction detected
- Warning chime at startup
- Failed safety inspection
Probable Causes (Ranked by Likelihood)
- Defective left front impact sensor Very High
- Damaged wiring to left impact sensor High
- Corroded connector at impact sensor Moderate
- Previous front-end collision with unreplaced sensor Moderate
- SRS module not receiving sensor signal Low
Step-by-Step Diagnostic Procedure
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Scan SRS system for all DTCs
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Inspect left front impact sensor mounting and connector
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Check wiring from sensor to SRS module for damage
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Measure sensor circuit voltage and resistance
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Verify sensor has not been damaged in a prior collision
Frequently Asked Questions
Where is the left front impact sensor located?
The left front impact sensor is typically mounted behind the front bumper on the left side, near the radiator support or fender area.
Can a minor fender bender damage the impact sensor?
Yes. Even minor front-end collisions can damage or misalign impact sensors, and they should be inspected after any front-end accident.
What does the impact sensor do?
Impact sensors detect the force and direction of a collision and send signals to the SRS module, which decides whether and how to deploy the airbags.