OBD Guide
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B2753

Horn Relay Control Circuit Shorted to Voltage

B2753 is an OBD-II diagnostic trouble code meaning: Horn Relay Control Circuit Shorted to Voltage. Common causes: shorting the control wire of the horn relay to the supply voltage, horn relay malfunction (contacts stuck). Estimated repair cost: $3–111.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$3–111 (est.)

Symptoms

  • The horn constantly sounds or does not turn off
  • Or the horn does not work completely when you press the button
  • BCM malfunction indicator light is on
  • Blown horn circuit fuse

Causes

  • Shorting the control wire of the horn relay to the supply voltage
  • Horn relay malfunction (contacts stuck)
  • Damage to the wiring insulation in the mounting block
  • BCM malfunction (internal short in relay driver)
  • Moisture entering the fuse and relay mounting block

How to Fix

  1. Read BCM error codes and check for adjacent codes
  2. If the horn sounds constantly, remove the horn relay from the mounting block to immediately turn off
  3. Check for voltage at the relay control contact with the BCM turned off
  4. Check the control wire for short circuit with the power wires
  5. Replace the horn relay with a known good one.
  6. If there is a short circuit in the wiring, find and eliminate the location of the damage; if in BCM - replace the module

Related codes

B2752B2754B2755

FAQ

What does the B2753 code mean?

B2753 is an OBD-II diagnostic trouble code that indicates: Horn Relay Control Circuit Shorted to Voltage

What causes a B2753 error code?

The most common causes of B2753 include: Shorting the control wire of the horn relay to the supply voltage; Horn relay malfunction (contacts stuck); Damage to the wiring insulation in the mounting block; BCM malfunction (internal short in relay driver).

How do I fix a B2753 diagnostic trouble code?

To fix B2753: Read BCM error codes and check for adjacent codes. If the horn sounds constantly, remove the horn relay from the mounting block to immediately turn off. Check for voltage at the relay control contact with the BCM turned off. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2753?

Yes, but get it checked soon

How much does it cost to fix B2753?

The estimated repair cost for B2753 is $3–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat