Q: Car turned off completely during highway driving

asked by on May 24, 2016

While I was driving at highway speeds, my coupe turned off completely. This happened at two highway trips for no apparent reason. What could be the problem? What should I check first?

Battery Light is on Inspection $79.99 - $89.99 Get a Quote

In order for an engine to continue running, it must have three things. These things are compression, fuel, and ignition. If one of those three things goes away, the engine will no longer run.

I would recommend checking your alternator first. Although the alternator is not directly a part of the fuel or ignition systems, an alternator failure could cause these systems to malfunction.

The alternator is what keeps all the electronics in your vehicle going while you are driving while also charging the battery. If your red battery light were illuminated directly before the vehicle died, that would be another indication of a faulty alternator.

I would recommend having an inspection of your battery light issue performed by a certified mechanic as this relates to the electrical system and personal injury may result if this is not addressed in a timely manner.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

What others are asking

Car makes a "BOING" sound in the back when turning or hitting

You will need to have the rear spring mounts and insulators checked to see if they are worn out and need replaced.

Car reads "Pressure Control Valve 3V". I believe it has to do with a solenoid.

Hello. I would need to know some more information about what you car is doing to be able to help with a diagnosis. If it is giving a pressure control code then most of the time this is caused by...

When I start accelerate, feels like there's an anchor holding the car

Hey there. Without additional detail as to the characteristics of the acceleration it may be difficult to diagnose without test driving the car. You will want to check to see if the acceleration feels more like a jerking or surging...

What would cause the MPG gauge to fluctuate on a 1999 BMW 323i?

Hello, thank you for writing in. There are several different systems that interact with the fuel system which effect fuel economy. The first that you will want to check is the ignition system. Make sure your spark plugs are new...

Lack of power at full throttle.

Hi there. Your scooter has a fuel flow restriction which could either be in the tank, lines, or carburetor itself. Let off the throttle and open the throttle again. If the scooter fixes its self, then the float bowl in...

humming noise

It sounds like you have a wheel bearing going bad. Noisy wheel bearings will only make noise when the car is in motion. They will get louder the faster you go. They also change pitch, or get louder or more...

I have a 2008 f250 with a 6.4 diesel. I have the updated hoses on it. I moved the top hose at the radiator and I heard pressure re

Your best indication of the efficiency, and condition, of the cooling system is the engine operating temperature. If the operating temperature is in the "normal" range for your engine, then you need not worry. As far as the generation of...

Fail Safe Mode coming up on dashboard

The output speed sensor is a very important sensor for the computer in your BMW 540i. It uses this signal to determine shift points as well as when to lock up the torque converter. If the computer detects a problem...

It knocks once after i start it up only one time and when i'm drivin a charm is played kind of like an alarm what should i do?

Hello there, a knocking sound can cause problems if left unresolved in your 2008 BMW 535xi. A knocking noise can be caused by a few different faults such as an engine mount, engine knock, failing alternator, or AC compressor. If...

Related articles

The Best Used Cars to Buy If You Live in a Windy Area
If If you live in a windy area, one of the most important things you’re going to be looking for in a used vehicle is the ability to remain stable on the road on even the most blustery days. That...
Why Do Cars Have Different Oil Change Intervals?
Car oil change intervals depend on the make, model, and year of the car. The correct type of oil and how the vehicle is used makes a difference too.
How Long Does a Throttle Position Sensor Last?
The The throttle body in your car is a rather involved system that is part of its air intake system. The air intake system is responsible for controlling the amount of air that you are letting into the engine. In...