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.

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 1,000 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: Emission and Suspension

Hello. To address the converter, there is no cure for a failing converter. In many cases, these cleaners will clean out some of the build up in the converter but definitely not all of it. You will end up needing...

Q: I replaced solenoid and and sensor in my transmission still won't shift properly 1997 Dodge RAM 1500

Hi - the lack of up-shifting in your transmission could be an internal speed sensor, or line pressure failing to engage higher gear clutch packs. With your higher mileage, this is difficult to tell without real diagnostic testing. Check for...

Q: What should I do if the shifter won't change gears?

Hi, thanks for writing in. This is likely a shift linkage issue. There is a small plastic piece on the shift lever that helps to connect the shifting cable to the lever you see inside the vehicle. When these break,...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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.