Q: Just replaced PCM and battery on 2012 town and country, alternator fine. check engine light and battery light came on why?

asked by on

Just replaced PCM and battery on van after dealership said this was the problem. Alternator is fine and does not need to be replaced. Van ran fine for a week now check engine light and battery light is on again

My car has 98000 miles.
My car has an automatic transmission.

It sounds like you may have a failing voltage regulator. When the voltage regulator is not working properly, this may 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 other cases it may result in the alternator not supplying enough power to the battery, resulting in undercharging the battery or not charging it at all. In some cases when a battery is too weak or damaged, it may no longer hold a charge for any length of time, in which case the alternator may be doing its job, but the battery is just simply too weak to hold a charge. 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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Just replaced PCM and battery on 2012 town and country, alternator fine. check engine light and battery light came on why?

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: How do I seek tune the radio?

Seek tuning will search for available radio stations, and take you to the next available one. To use this feature, press the Seek buttons. If you press the Seek Up or Right button (depending on your model), you will be...

Q: why did my 2007 Cadillac CTS shut off while driving

You may have a bad fuel pump or connector to fuel pump. You will need to have the computer tested for codes and continue diagnosis of the codes or fuel pump.

Q: Water pump going out

Hello. It is not clear how you determined having a bad water pump or clogged system. If the engine water temperature is higher than 220F, sometimes the symptoms can indicate a weak, or non-functioning thermostat. Newer water pumps have plastic...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...