OBD Guide
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B1C55

Horn Relay Circuit

B1C55 is an OBD-II diagnostic trouble code meaning: Horn Relay Circuit. Common causes: faulty horn relay, open or short circuit in wiring harness. Estimated repair cost: $6–33.

Severity
✅ Low
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$6–33 (est.)

Symptoms

  • The sound signal does not work
  • The signal is unstable
  • Check Engine light comes on

Causes

  • Faulty horn relay
  • Open or short circuit in wiring harness
  • Blown fuse
  • Problems with contacts in the circuit

How to Fix

  1. Check the horn circuit fuse
  2. Check horn relay
  3. Inspect the wiring harness for damage
  4. Check contacts and connections in the circuit
  5. Replace faulty components

Related codes

B1C56B1C57

FAQ

What does the B1C55 code mean?

B1C55 is an OBD-II diagnostic trouble code that indicates: Horn Relay Circuit

What causes a B1C55 error code?

The most common causes of B1C55 include: Faulty horn relay; Open or short circuit in wiring harness; Blown fuse; Problems with contacts in the circuit.

How do I fix a B1C55 diagnostic trouble code?

To fix B1C55: Check the horn circuit fuse. Check horn relay. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1C55?

Do not drive — repair immediately

How much does it cost to fix B1C55?

The estimated repair cost for B1C55 is $6–33. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat