Skip the auto shop - Our mechanics make house calls

Q: Car alarm goes off all on its own, can’t start car

asked by on

I have not had very many problems with my 2008 Toyota Highlander so far (and I am at 101,000 miles!) but the main problem I am having now is very...noticeable. The alarm will go off randomly and lock the whole thing down. I love the high security, but when I can’t even use my own car it has gone a bit far. This was funny like once, now it needs to stop. What way can I fix this that won’t lead to more electric gremlins down the road?

This is a common issue for this generation of Highlander. The contacts in the hood latch for the alarm system wear out or otherwise get damaged through use. If the alarm computer is not sensing proper voltage through the switch, the alarm will activate. A local mechanic (like those with YourMechanic) can inspect, diagnose, and replace the faulty hood latch.

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: Cold weather makes the motor knock

This is a common problem with Hybrid Highlanders. Does the Check Engine Light illuminate when the knocking occurs? If so, Toyota released a technical service bulletin (TSB) related to cold start misfires. The associated TSB (T-SB-0210-11) covers the inspection, diagnosis...

Q: Over filled oil

Hi there. I can honestly say that I have actually done this myself - once. The best way to resolve this issue is to complete a full oil and filter change to begin. This will allow your engine, oil galley...

Q: Smoke comming from vent by windsheild wiper on hood and tail pipe.

Hello, thank you for writing in. There are several fluids that will cause smoke in the tail pipe. Whatever is leaking is likely both an internal leak (leaking into the combustion chamber or exhaust), and external leak (leaking onto the...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...