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.

A: Hello, thank you for writing in. The chargi...

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

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: I was driving down the road just fine all of a sudden my battery light came on for a second then all of my lights came on and then

Hello. Obviously, there's an electrical issue. To rule out the simple and obvious possibilities have the battery load tested at a major, reputable battery store (this is a common test; they have the tester) to be sure the battery doesn't...

Q: Transmission was slipping. Could it be the VSS?

Hi there. For the speedometer to be malfunctioning, either the vehicle speed sensor (VSS) could be loosing signal or the gauge has a bad resister. Now, as far as the transmission slipping, check the transmission fluid level. If the fluid...

Q: Car turns over and has a really rough idles but will not accelerate

Hello there, many faults will cause your 1998 Chevrolet Malibu to have a rough idle but lack acceleration. Before any more parts are replaced the vehicle must be diagnosed fully to get to the root cause. With all of the...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...