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 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. Grinding noise, no acceleration, and filthy transmission fluid

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: Engine revs but van is slow to kick into gear. There is also some redish fluid sprayed all over the engine. The stick shows full.

SPIII ATF is the correct fluid for your vehicle. The fluid in your transmission may have been over filled. Make sure the fluid level is checked after the transmission is warmed up and driven a while. The fluid will...

Q: Car shaking on startup, engine revving

Hello there, a few different faults can cause the car to shake and have issues with acceleration. The most common would be the the spark plugs and wires, a fuel pump issue, faulty MAF sensor, a vacuum leak, or a...

Q: Rough gear engagement

It sounds like your car may be low on transmission fluid or you may potentially have a faulty transmission control solenoid causing an erratic shifting into gear. As you may know, transmissions use hydraulic pressure created by the transmission fluid...

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 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...
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.