OBD Guide
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B1521

Hood Switch Circuit Short To Battery

B1521 is an OBD-II diagnostic trouble code meaning: Hood Switch Circuit Short To Battery. Common causes: damage to the wiring harness in the area of the hood switch, hood switch malfunction. Estimated repair cost: $22–56.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$22–56 (est.)

Symptoms

  • The security system malfunction indicator is on
  • Incorrect operation of the security system (for example, automatic door locking does not work)
  • Error persists after reset

Causes

  • Damage to the wiring harness in the area of the hood switch
  • Hood switch malfunction
  • Short circuit due to oxidation or damaged insulation
  • Problems connecting to the battery

How to Fix

  1. Check the condition of the hood switch and its connection
  2. Inspect the wiring harness for damage or oxidation.
  3. Check the voltage in the hood switch circuit
  4. Replace the hood switch if necessary
  5. Repair short circuit in wiring harness

Related codes

B1520B1522

FAQ

What does the B1521 code mean?

B1521 is an OBD-II diagnostic trouble code that indicates: Hood Switch Circuit Short To Battery

What causes a B1521 error code?

The most common causes of B1521 include: Damage to the wiring harness in the area of the hood switch; Hood switch malfunction; Short circuit due to oxidation or damaged insulation; Problems connecting to the battery.

How do I fix a B1521 diagnostic trouble code?

To fix B1521: Check the condition of the hood switch and its connection. Inspect the wiring harness for damage or oxidation.. Check the voltage in the hood switch circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1521?

Do not drive — repair immediately

How much does it cost to fix B1521?

The estimated repair cost for B1521 is $22–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat