Q: Car alarm goes off for no good reason. At times I have seen the hood ajar error.

asked by on

Alarm goes off for no good reason, I have seen the error hood ajar. I tried to jump the switch out but which 2 of the 3 do I jump? I hope I am on the correct line of troubleshooting or have you seen another cause for the problem?

My car has 60000 miles.
My car has an automatic transmission.

Hi, thanks for writing in. Your car is equipped with an anti-theft system which functions based upon the use of sensors that detect the car’s points of entry (i.e. doors, trunk, hood, etc). When the anti-theft system is set (usually when manually set with key fob or in some cases when the key fob reaches a certain distance away from the vehicle), these sensors are armed. When there is any movement or breach of these, this is what sets the alarm off. Occasionally, these sensors will malfunction causing the alarm to go off without reason. I would recommend having an expert from YourMechanic come to your home or office to confirm a diagnosis on the issue and make or suggest the necessary repairs or replacements.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Car alarm goes off for no good reason. At times I have seen the hood ajar error.

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 SUV is running hard and has the Diagnostic Trouble Code P0016

Hi and thanks for contacting Your Mechanic. The code P0016 is for the crankshaft position sensor. Check the wiring harness to the sensor that is located on the bottom of the engine by the crankshaft pulley. Check for voltage and...

Q: Alarm won't reset so car wont star't.

Hi there. Remove the battery cables to the battery for 13 minutes. While the cables are off, put the key in the ignition and turn it on. Operate everything in the vehicle. This will drain all of the power in...

Q: 4T65E just replaced 08 Lucerne 3.8L, replaced plugs/wires/1 coil pack melted at #4 so replaced it now rough idle

The coil pack melts down for a reason and cause will need to be diagnosed what caused it. The most common cause is a short in the signal wire or excessive resistance in the plug wires or plugs. I recommend...

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...