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OBD Code B1520

Hood Switch Circuit Open

CodeB1520
DescriptionHood Switch Circuit Open
SystemBody

What Does B1520 Mean?

Hood Switch Circuit Open. 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 B1520

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

  1. Test the door lock actuator — listen for it buzzing without locking.
  2. Check the door lock switch and wiring.
  3. Inspect the door latch mechanism for proper operation.
  4. Check the body control module (BCM) output for the affected door.
  5. Inspect wiring in the door jamb boot for broken wires.
  6. Replace the door lock actuator if it is not engaging.
  7. Clear codes and test lock/unlock from key fob, interior switch, and door handle.

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 B1520 serious?

The severity depends on the underlying cause. Some triggers for B1520 are minor (like a loose gas cap), while others may indicate a more significant problem. We recommend having the code diagnosed with a proper scan tool to determine the exact cause before deciding on urgency.

Can I clear B1520 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 B1520?

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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