Skip the auto shop - Our mechanics make house calls

Q: Grinding noise, no acceleration, and filthy transmission fluid

asked by on

My truck started murdering batteries if I leave it parked for a few days. The first time it happened, I got a brand new battery. Left the truck for a few weeks, and it was dead again. Got it jump started, had a shop check the battery, and they said it was bad again. I replaced the battery AGAIN, and by the next morning, it was dead. My alternator is putting out around 14V. There are no dome lights or rear lights on. I don't have any power features - no power windows, locks, or alarm, or any of that. I just have cruise control, and a radio that's been working fine for two years. No fan noises when I cut it off. The problem only started recently. What could be causing my batteries to die so quickly and frequently?

Hello. If your batteries are dying that fast, then something is staying on electrically in your vehicle. If you do not have power windows or door then this should make it simple to diagnose.

I typically start by checking to see if any circuits are staying on or if any relays are staying engaged. If I find nothing from there, then the issue is typically caused by a bad ignition switch that is not turning off, or a bad body control module. Both of these are very common.

I always start by testing the ignition switch as it is much easier to test and replace than the body control module, which would need to be programmed to the vehicle should it need to be replaced. If you are needing to have the vehicle repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose your battery issue and perform any needed repairs.

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: My 1999 Buick Regal will go into reverse and move, but when I put it into drive it just revs up and won't move.

Hi there. Check the transmission fluid and see if its low or dark. If the fluid is full and red in color, then the transmission is slipping. I recommend seeking out a professional, such as one from Your Mechanic, to...

Q: I'm not sure what is wrong with the car and I don't want to pay a ridiculous amount for a diagnostic check.

Hello. You can try taking your car to a local auto parts store and have them plug into the scanner to see why the Check Engine Light is coming on. It may give you an idea if what is wrong,...

Q: Gears won't shift

Hello. There are several things that can cause this. You need to start by checking to see if the shift linkage is moving on the transmission when you try putting it into gear. If not then the linkage may not...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...
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.