Skip the auto shop - Our mechanics make house calls

Q: Horn honks randomly

asked by on

The car horn randomly blows. We think the wire is grounding out. The horn is currently disconnected and still honks randomly.

Hi. The horn switch on the steering wheel energizes a relay on the vehicle which then powers the high amperage horn. A shorted wire or malfunctioning relay in the system are possible causes for the intermittent activation. Have an experienced technician inspect the electrical system and circuitry for faults.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My horn won't work

The horn being inoperative could be from either the steering wheel clock spring, or the horn assembly. Both have been known to cause the problem you described. The Check Engine Light could be on for a sensor problem, or a...

Q: Truck not starting after replacing starter

Hi, is the check engine light on? Sometimes a no start will throw a diagnostic code which will help in solving the issue. Certain sensors, such as the crankshaft position sensor, are needed to run the engine and if the...

Q: Speedometer not working

That particular vehicle uses an electronic sensor to operate the speedometer. If your speedometer is not working, that may be a sign that there is a problem with the speedometer sensor or wiring. A problem with the speedometer circuit or...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.