Skip the auto shop - Our mechanics make house calls

Q: Low voltage light stays on

asked by on

The battery died the other night because I left the key on so I had gave it a jump took a few times n finally started now the low voltage light won't go off it drives fine and before that the speedometer doesn't work either

My car has 213000 miles.
My car has an automatic transmission.

It sounds like you may have a weak battery, a failing voltage regulator or failing alternator. As you may know, the alternator is responsible for charging the battery while the engine runs by generating amperage and recharging the battery while the engine turns the alternator. The voltage regulator is a unit that regulates the charging of the battery by the alternator and maintaining a certain amperage while the engine runs. When the alternator is not working properly, this may result in the battery quickly losing charge and the car losing all power. You may also notice a whining sound as a result of the bearings inside the alternator begin to fail. I would recommend having an expert from YourMechanic come to your location to diagnose and inspect your charging system.

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

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: My car is showing code P1445

Hi Emily. This is one of the common codes associated with the secondary air injection system on that particular Toyota engine. One of the valves may have failed or has contamination inside. The secondary air injection system is an emission...

Q: How do I use electronic range selection (ERS)?

Electronic range selection (ERS) allows you to put a range on the gears available in your automatic transmission. If you are in “Drive,” for instance, your vehicle can use every gear. ERS allows you to set a limit for the...

Q: Power window not working

The window regulator and motor are the most likely causes of the window not going down. If you hear the motor running, but the window does not move, then the regulator is broken. If you do not hear the motor,...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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 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.