Skip the auto shop - Our mechanics make house calls

Q: Loses all power

asked by on

Sometimes when you just turn the vehicle on it loses power. No rhyme or reason. Daily driver. Maybe happens 4 times out of 20 times turning it on.

For instance, this last time, wife turns on headlights (car not running). As shes walking to rear of vehicle, loses all power (headlights, dash, radio needs reset, etc). When she opened rear hatch everything comes back on. Thats just one example.

One time tried to unlock door with fob. Wouldn't work. Manually opened door, then worked fine.

So far hasn't happened when being driven.

Also, seems like sometimes you can see the dash lights slightly flickering when it's running.

Wondering if there is some sort of master relay that controls power to the vehicle.

My car has 204000 miles.
My car has an automatic transmission.

Hello, thank you for writing in. Intermittent problems like this would not likely be a fuse issue. Fuses blow when they receive too much power, or too fast. Once they blow the component protected by the fuse will not function. With that being said, you want to turn your attention towards the ground connections and power supplies to these parts. If the ground connection for the fuse box is loose, it will make produce similar symptoms. With the entire car being effected at times, you may also want to make sure your battery’s ground connection is clean, dry, and tight. Further electrical testing needs to be done. For help with this testing, contact our service department to schedule an appointment.

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: Change or repair engine

Hello. In most cases, it is more cost effective to install a rebuilt or even a new "crate" motor, than to repair a seriously damaged engine as you describe. The economies of scale for new engines have lowered the cost...

Q: Check engine light after repair of alternator and leaky oil valve cover gaskets on a 2006 hyundai Tucson

Any one, or more, out of a list of thousands of OBD-II Diagnostic Trouble Codes could have caused your vehicle's Check Engine Light to illuminate. Even though in your case the check engine light has come on immediately after specific...

Q: Recommendation on which type of oil to use on a 2010 Altima and 2005 Sonata

I have a 2010 Altima and a 2005 Sonata. I live in Florida and it never goes below freezing. Can I run a 10W-40 as the oil seems to thin after 2000 miles? If not 10-40, is 10-30 okay?

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...