My car alarm is preventing my car from starting w/ a dead battery

It is possible that the car's alarm/immobilizer system is preventing the vehicle from starting. Manufacturers, in an effort to prevent car theft, have the immobilizer activate if the battery circuit is interrupted for more than a certain number of minutes. This keeps car thieves from cutting battery cables to prevent alarm activation. If the battery goes flat-line dead, the same thing can occur. You need a special tool available at a dealer or repair facility to reset the immobilizer.

In most cars & truck with this problem, the most common reason is a defective alternator.
In the meantime, unhook that battery each time you stop the truck to prevent dead batteries.

check for a bad connection like a bad ground at the battery, make sure both terminals are tight at the battery, the starter and the ground at the engine. the shop that installed the EGR should have erased the codes, after 50 to 100 miles you would be able to go through emissions.

Did you check the alternator? if it is faulty the car will drain all the power from the battery until it goes flat

your alarm system has been tripped when the battery went dead, to get the information on how to reset the alarm is to call the car manufacture to get the procedure, and should not cost you anything.

The alarm system, which is activated by hitting the auto-lock button, causes the battery to drain if set off. A pretty good deterrent for theft, but definitely not a owner-friendly feature.

You'll know that the alarm was triggered if, upon (your sad attempts at) starting the 1989 Dodge Dynasty, the "Alarm" signal to the left of the steering column flashes. It normally would flash a certain number of times, to denote "Alarm Set Off! I have drained the battery power in the name of Security!" But usually you battery will die first.

The only way TO FIX THIS PROBLEM: exit the vehicle. Place the key in the driver's side door. Turn the key once to the left (counterclockwise) to lock it. Then turn it to the right to unlock it and open the door. Enter the vehicle. Start the car.

You may have to try this a few times in order to be successful. If your battery has been toasted by these attempts (sometimes the horn will honk and headlamps light up and flash for added battery-drain quickness!) you may need a jump.

To PREVENT THIS STUPID STARTER/ALARM PROBLEM: Simply use your hand to lock the door. Do not push the electronic auto-lock button.

You need to check for any lighting left on overnight if not try to fully recharge your battery and perform a load test on it to see if it will hold the charge if so possible drainage off of interior lighting switches or alarm possible

both,the battery has been run down too many times and your radio have a heavy power draw,if you have an aftermarket alarm it may have something to do with the problem.

have you not left any load on overnight?..like park light or left the door partially open and the dome light would be left on?

have the battery recharge and the next night, make sure that no light would be left on the car.

if it would drain out again, have it recharged again, use it and on the night, make sure no light is left on the car, then remove the positive pole on the battery overnight.

the next morning, put the positive cable back and start the car.

if the car would start, then no problem with the battery, if the car would not start, then return the battery because it is defective.

tnx 4 using fixya,

drcool

1999 CONCORDE: check the battery terminals probably they are not tight enough...something like that happened to me just the lights turned on and the car seemed to be dead, the battery is still ok since then. I just needed to buy new terminals.