Q: 2002 chrysler t & c alternator good but does not charge battery also behind dash buzzing sound

asked by on

2002 chrysler T & C a few days ago started to have problem in charging system battery light came on. Checked alternator (good) & battery (good). Charged up battery. Drove T & C battery light came on battery loosing charge. Car still working and battery keeps going down. Today started a buzzing sound behind the dash and is not coming from motor area. I have gotten P 0455 on codes from vehical internal test. Also my charge indicator says alternator bad but off vehical test says good. What do you think.

My car has 157000 miles.
My car has an automatic transmission.

Code P0455 relates to your EVAP system that controls the evaporation of fuel fumes in your fuel tank. The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system collects and temporarily stores the fuel vapors in the charcoal canister. The charcoal canister is filled with activated carbon pellets that can absorb the fuel vapors. When the engine is running, the fuel vapors are purged from the canister and burned in the engine. The vent control valve solenoid controls the flow of outside air in and out of the charcoal canister. When this solenoid is not working properly, this will cause the car to hold onto harmful fuel vapors inside the tank which can result in many other problems.

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 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 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!
  1. Home
  2. Questions
  3. 2002 chrysler t & c alternator good but does not charge battery also behind dash buzzing sound

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: My battery is low but I didn't get a jump yet

If you installed a new alternator and battery and the battery has subsequently died, there could be something wrong with the charging system. The best thing to do is fully charge the battery, start the car and then measure the...

Q: Vehicle shutting off after a loud squeal.

Based on your description I believe you could be having one of two things happening. One explanation of your squealing noise could be a slipping serpentine belt. This belt drives all the accessories attached to your engine such as your...

Q: Charcoal can gas leak

All modern cars are equipped with an Evaporative Emission Control (EVAP) system. The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system collects and temporarily stores the fuel vapors in the charcoal...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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...
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.