Skip the auto shop - Our mechanics make house calls

Q: Battery light

asked by on

Battery light came on. Car also shut off. But started right back up. Car battery had dead cell in it. Replaced battery. Had alternator checked, it's good. But battery light still comes on and still shuts off. What other thing can I do to fix the problem? My car has an automatic transmission.

Hello, thank you for writing in. The charging system is controlled by the PCM (powertrain control module). The module receives input information to keep the electrical system operating, if the voltage goes below 9.0 volts the light will come on and causes the module not to operate producing a stall condition. To test this, you have to have the issue happening at the time. There is test equipment that has to be used-- you can find information about that and servicing it in our article here. If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect this light for you, and make or suggest any repairs as needed.

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: Battery light on, temperature gauge maxed out, A/C system not working correctly

Hi, thanks for writing in. What you are describing happened to me personally a few weeks ago. It sounds like one (or both) of the accessory drive belt(s) that turn your alternator, water pump, and power steering pump is...

Q: pre purchase inspection computer codes

Hello, thank you for writing in. Typically an OBD-II scan is not required for a pre-purchase inspection. However, most techs do have the ability to scan the vehicle for you if you wish. You are taking the right steps in...

Q: Currently 165 65 R14 tires are mounted on my car. Can I get 165 70 R14 tires? What is the difference between the two?

The 165 on the tire size means how wide is the tread across the tire. The 65 is the side wall size to the tire and how much the tire is considered a low profile tire or a high profile...

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...
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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...