Skip the auto shop - Our mechanics make house calls

Q: Car turned off completely during highway driving

asked by on

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?

A: In order for an engine to continue running,...

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.

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・Save up to 30%

Get a quote

What others are asking

Q: Turbo wastegate stuck closed. Need solution.

Hello. P2261 is the code for an issue with the vehicle's turbocharger bypass valve, also known as the wastegate. If the computer detects an issue with the wastegate circuit or signal it will activate the Check Engine Light in order...

Q: Car cranks slowly when it is hot, but cranks normal when the engine is cold

It sounds like your starter motor could be overheating. If the starter overheats, this can cause it to malfunction. I would recommend having your starter inspected and replaced as necessary by a certified mechanic. Once you have a new starter,...

Q: Steptronic shifter stopped working

It seems that the switch in your shifter assembly that tells the computer you want to shift a gear manually has failed. The switches for the paddles on your steering column are still good. So they are functional. This is...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.