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OBD Code B1902

Air Bag Crash Sensor #1 Ground Circuit Failure

CodeB1902
DescriptionAir Bag Crash Sensor #1 Ground Circuit Failure
SystemBody

What Does B1902 Mean?

Air Bag Crash Sensor #1 Ground Circuit Failure. This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the body.

Code Breakdown

B = Body code

1 = Manufacturer-specific

How to Fix B1902

Follow these diagnostic steps to identify and resolve the issue. Always start with the simplest checks before moving to more involved repairs.

  1. Warning: Always disconnect the battery and wait at least 10 minutes before working on SRS components.
  2. Check the clockspring connector under the steering wheel.
  3. Inspect all SRS connectors — under seats, in the dash, and at the pillars.
  4. Check for corroded or damaged wiring, especially after water exposure.
  5. Check for TSBs related to airbag sensor or module issues for your vehicle.
  6. Replace the faulty SRS component and clear codes.

Note: These are general diagnostic guidelines. Some vehicles may have model-specific procedures. Always consult your vehicle's service manual for exact specifications and torque values. If you are not comfortable performing these steps, visit a qualified mechanic.

Frequently Asked Questions

Is B1902 serious?

Yes — B1902 is considered a critical-severity code. You should have it diagnosed and repaired as soon as possible. Driving with this code active may cause further damage to your vehicle or pose a safety risk.

Can I clear B1902 myself?

You can clear any OBD-II code with a code scanner or by disconnecting the battery for 15-30 minutes. However, clearing the code without fixing the underlying problem will cause it to return — usually within one or two drive cycles. If the code triggered the check engine light, the light will come back on. Fix the root cause first, then clear the code.

How much does it cost to fix B1902?

Repair costs vary widely depending on the root cause. Some fixes are free (like tightening a gas cap) while others can cost several hundred dollars (like replacing a catalytic converter or oxygen sensor). A proper diagnosis with a professional scan tool — not just reading the code — is the first step to getting an accurate repair estimate. Many auto parts stores offer free code reading, but a thorough diagnosis usually requires a mechanic.

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