Q: What causes a major power loss while going down the highway?

asked by on

While driving, I lost all power, but the engine was still running. Made a pretty bad noise a few times while driving... made it home driving very slow. Kinda sounded like that clicking you hear when you have a dead battery but worse. All gauges went dead. I noticed the battery slowly losing juice then the bad clicking noise and everything shut down but the engine...

My car has 200000 miles.
My car has an automatic transmission.

Hi there. The problem you are describing, losing electrical power while driving, sounds like a charging system problem. The PCM (powertrain control module) has been engineered to recognize low charging voltage and systematically shuts down accessories to keep engine running. The clicking noise may have been coming from the alternator and/or serpentine belt tensioner assembly. I recommend having the charging system inspected. It may be, the only problem your vehicle has is a faulty alternator. I recommend having your vehicle diagnosed and repaired by a certified technician from YourMechanic.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. What causes a major power loss while going down the highway?

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: How do you adjust the roof rack?

While your roof rack might give you the ability to carry extra cargo strapped to the top of the car, you have to adjust it properly. It can hold up to 100 pounds, but it needs to be distributed properly....

Q: Ac compressor. Blowing hot air through front vents and cold air through rear vents.

It sounds to me like you have a blend door actuator problem. The blend door actuator is responsible for controlling the blend door. The blend door is responsible for blocking off air to the heater core when your air conditioning...

Q: Intermittent Low Oil Pressure

Hi There, I believe your assumptions are correct in that it sounds like you may have a faulty oil pump that may not be circulating the oil through the motor properly. This may be what is causing the knocking sound...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.