Skip the auto shop - Our mechanics make house calls

Q: Starter, alternator, or battery?

asked by on

Car died the other day mechanic said my cars alternator was running 12.5 volts instead of the 15 it is supposed to run but it should be fine for a while. I turned my car off later the night and it would not turn back on the next morning, my neighbor jumped it again and it stayed on but once again after turning off it wouldn't start Could it be that I killed my battery completely or is it my alternator.
My car's transmission is unknown to me.

A: Hi there. In most cases, when you're pu...

Hi there. In most cases, when you're pulling less than 15 volts from the alternator the issue is caused by an internal component failure within the alternator itself or the alternator relay. If the starter is not receiving the correct amps, it's the battery that is at fault. With this type of situation, the best recommendation is to have a professional mechanic complete a no start inspection first. From there, they can determine if your VW issues are caused by the alternator, battery, or the starter. It may be a combination of two that need to be replaced - especially if the battery has not been replaced in the last few years.

Was this answer helpful?
Recommended services
Get a Quote

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・Save up to 30%

Get a quote

What others are asking

Q: A/C blowing hot air

If only one fan is running, this would suggest that at least one of your fan relays is bad. If the AC is blowing hot air, this could be either low on refrigerant or you may have a bad temperature...

Q: Rattle noise.

The rattle you may be hearing is the catalyst which is broken up inside and is partly blocking the exhaust. The blockage may be severe enough to completely block the exhaust causing the no start, or stall and overheat. Have...

Q: Tires that came from the factory are not good at all

The tires which came with your vehicle should not have had problems with sidewalls cracking or blowing out. I would recommend having the tires checked by the manufacturer for issues or defects which may be covered. To find replacement tires,...

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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control 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...
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...