Skip the auto shop - Our mechanics make house calls

Q: PCM

asked by on

Bought a new PCM put it in right about 30 miles and same systems I had again not charging my alternator battery going dead voltage radiator it's not charging my battery what causes a PCM to go out

My car has 12833 miles.
My car has an automatic transmission.

A: It sounds like the voltage regulator may be...

It sounds like the voltage regulator may be overcharging causing it to essentially electrocute the PCM. As you may know, the voltage regulator regulates the voltage in the system by not allowing the alternator to over charge the battery. 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. Often times this will result in the alternator allowing too much power to be delivered to the battery resulting in damaging wires and prematurely sometimes destroying the battery. In either case, I would recommend having an expert from YourMechanic come to your location to diagnose 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・Save up to 30%

Get a quote

What others are asking

Q: Hemi top end started making 5loud noise.

Hello. To answer you first question, yes, defective lifters can cause loud knocking noises to come from the cylinder heads. If any of the lifters get stuck or lack lubrication it may cause them to make a noise. The noise...

Q: Can I trust the mechanic?

Yes, generally most scanning tools and equipment will indicate specific codes that will direct you to what may be causing the problem. There are numerous scanners out on the market that are fairly inexpensive that will generally indicate what codes...

Q: will a temperture switch cause an engine not to start?

The engine coolant temperature sensor sill not cause the engine to die or not start, but can cause the fuel system to go full rich. The engine dies when getting hot is most likely due to an ignition spark loss...

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...
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.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.