Dead Battery 2yr old battery dead. alot of corrosion on post. jump started and made it home. cleaned corrosion with baking soda. still won't start and trunk pops open when the ignition is turned off. Remote door lock and lights still work. Is it the alternator? Thanks

Start with the battery.
Have it tested.
Being 12 years old, look for corrosion, around the battery connections.
Next will be the starter and/or the solenoid.
Whoever checks the battery and connections, and the starter or solenoid, can tell you what steps to take next.
God bless your efforts.

Possible dirty battery cables or a poor engine battery ground cable connection. Clean the battery cables of any corrosion (at the battery) and the ground connection to the engine, have the battery tested as well. Also don't post twice, modify and answer the experts questions on the first post please. You can buy a cable inside cleaner for cheap at any auto parts store. Use baking soda to neutralize acid, wear eye protection, the acid residue (***********) can send you to the ER if you get it in your eyes.

• Sound like a dead battery

1. Check the battery cables clean
2. best way is to loosen and remove cables
3. clean posts and inside of cable were it goes over post till there silver
4. reconnect dirty cables #1 cause. OR:
5. mix 4 table spoons of baking soda with large pitcher of water and slowly pour over battery posts and cables let bubble till done
6. get a jump
7. test battery voltage with volt meter should be 12 volts or better

Lots of folks buy a battery when all they need to do is clean it
Hope this helps Mike

Check all thick gauge cables from the battery to ground, solenoid and starter for tightness. If you find corrosion (it's caused by leaking battery acid) on battery terminals, remove cables and clean battery posts and clamps thoroughly with a wire brush and then scrub with a mixture of 25% baking soda / 75% water on an old toothbrush dipped in the mixture. Continue adding & scrubbing with mixture until fizzing stops. When fizzing stops, the acid has been removed. Next, wash down the whole top of the battery with the mixture and hose off when fizzing stops. Keep any caps secured to the battery! Do not let baking soda mixture enter the battery. You may need to charge or jump the car to get it started again - but the battery should accept a charge for the alternator at this point and keep from draining (assuming the battery is still good).

Clicking sounds when starting indicates low voltage. This can be a due to a battery that is no longer holding a full charge or a problem with loose and / or corroded cables / connectors at the battery posts, ground, solenoid or starter. Remove cable connectors that have corrosion / white flakey powder one at a time and clean with 25% baking soda / 75% water to neutralize the acid causing the corrosion - by scrubbing it with an old tooth brush dipped in the mixture. Then clean posts and connectors with a wire brush. Check to be sure any battery caps are on tight and then wet the entire top of the battery with the mixture to neutralize the acid on the battery, too. Do not allow the mixture to enter the battery. Hose off everything when done. Check all the other connections and clean / tighten as needed. Either charge the battery or jump it to start the engine. If the battery is good, the alternator should charge the battery and keep it charged for you.

It sounds as if you have a loose battery connection. Check the battery cable for tightness and clean any corrosion with baking soda and water. The battery may be weak as well if the cables were not tight it would not charge properly.

battery fauly

Check your battery connections for corrosion. Take off the negative and then positive connection to the battery. Clean the posts and terminals. You can use baking soda mixed in hot water to clean them. Be careful not to get the solution near the vent caps. Once clean put the positive terminal on and tighten. Then put on the negative and tighten. Check the battery voltage with a volt meter for more than 12 volts, 12.6 is normal. Try to start the car

Make sure both battery cable ends are clean on the inside, If your car still has side posts, it takes very little corrosion. 1 tablespoon of baking soda in one cup of water and an old toothbrush work great for cleaning them. After that, check the other end of both cables to make sure they are clean and tight.

some batteries last shorter as expeceted. replace the battery. think it is still under warranty