OBD Guide
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B1520

Hood Switch Circuit Open

B1520 is an OBD-II diagnostic trouble code meaning: Hood Switch Circuit Open. Common causes: broken hood sensor wires, hood sensor malfunction. Estimated repair cost: $11–56.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$11–56 (est.)

Symptoms

  • Check Engine Light Is On
  • Alarm goes off for no reason
  • The car won't start
  • Open hood message on dashboard

Causes

  • Broken hood sensor wires
  • Hood sensor malfunction
  • Corrosion or oxidation of contacts
  • Wiring harness damage
  • Problems with the control module

How to Fix

  1. Check the integrity of the hood sensor wires
  2. Inspect connectors for corrosion
  3. Test the hood sensor with a multimeter
  4. Replace sensor if necessary
  5. Clean contacts or replace damaged wires

Related codes

B1521B1522U0155

FAQ

What does the B1520 code mean?

B1520 is an OBD-II diagnostic trouble code that indicates: Hood Switch Circuit Open

What causes a B1520 error code?

The most common causes of B1520 include: Broken hood sensor wires; Hood sensor malfunction; Corrosion or oxidation of contacts; Wiring harness damage.

How do I fix a B1520 diagnostic trouble code?

To fix B1520: Check the integrity of the hood sensor wires. Inspect connectors for corrosion. Test the hood sensor with a multimeter. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1520?

Limited driving only, diagnose soon

How much does it cost to fix B1520?

The estimated repair cost for B1520 is $11–56. Actual cost depends on your vehicle, location, and labor rates.

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