Skip the auto shop - Our mechanics make house calls

Q: is the ecm the problem if battery light is on and the alternator isn't bad

asked by on

battery light is on and the charging system doesn't keep battery charged, alternator replaced as well as battery and no change to problem, the wire from alternator to battery block in engine compartment burns out and any direct wire made from alternator to battery block burns up - do not know if wire was damaged before old alternator was replaced, the actual battery is in wheel well, being told the ecm is culprit, the engine light is not on only the battery light, was told the voltage regulation of system is in the ecm for this year of car

My car has 87000 miles.
My car has an automatic transmission.

A: This is likely a sign of a failing voltage ...

This is likely a sign of a failing voltage regulator. This is a unit that regulates the charging of the battery by the alternator. In your case, it sounds like the voltage output from the alternator may be much too high resulting in overcharging the battery and burning up wires in the process. I would recommend having an expert from YourMechanic come to your location to diagnose and properly test your vehicle’s 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

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 keeps dying

Hello! It is a high possibility that it keeps dying because the battery is not holding a charge or the battery is not receiving a charge. I recommend testing the battery, alternator and starter. Our company provides on site vehicle...

Q: think i put wrong oil in car went few miles lose power car dies oil in spark plugs still starts low oil blinking light before die.

Hello. If you put too thick of an oil in the car, then you may have damaged the engine bearings but this should not have caused oil to get in to the spark plugs unless the oil got into the...

Q: "Charge Malfunction"

It sounds like there is a problem with the drive belt. It drives the alternator, water pump, and power steering pump. The belt may have broke, or some fluid leaked onto it causing it to slip. If the belt broke,...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...