Q: Battery drained and car key couldn't open car door.

asked by on

car problem was unable to open car told key had lost its memory, they reprogrammed it. 2 days later batter y completely flat new battery fitted by us, although Halfords did full test on it said it was good. Day later new battery was Completely drained, phoned Bell and Coleville Subaru garage, they picked up the car, they said it needed a complete new alarm system, this I couldn't understand as every time the battery drained the alarm was on until it fully drained. I paid the bill £700. Day later battery completely drained, they picked up the car once again, they said the new alarm system must have had a faulty part, they ordered another, finally told my car was ready the problem was, they didn't know it had to be wired differently as it was for the newer models. My Forester is in perfect condition it is an 03 with 53k miles always serviced regularly Bought from new. The first garage said they have disabled a perfectly good car. Does this sound right?

My car has 5300 miles.
My car has an automatic transmission.

Hi there. The battery is draining for a parasitic load applied to the battery over night. This will drain the battery to needing a charge or needing a replacement. If the alarm was installed and it was for a newer vehicle, as long as the wiring is correctly installed into the vehicle, the year of the alarm should not matter. The alarm was probably installed on the wrong circuit causing the other circuit to have a load applied to it when the key is turned off. I recommend disabling the alarm and see if the battery does not discharge. If so, then hook up the alarm to a different circuit isolating it from any other circuits. If you need further assistance with your battery draining, then seek out a professional, such as one from Your Mechanic, to help you.

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
  1. Home
  2. Questions
  3. Battery drained and car key couldn't open car door.

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: Dashboard draining battery

First, let's determine if the engine is cranking. If the engine is not cranking it could be any one of these issues: weak or defective battery, bad battery cables, ignition switch, starter motor, seized or hydrolocked engine, or other wiring....

Q: Q: White smoke comes out of Tailpipe.

The combustion process gives off a small amount of water, so the white smoke could be from condensation in hot exhaust gases, particularly in cold weather. In extreme cases, a head gasket rupture causes coolant to leak into the engine...

Q: Neither my electronic key or car will start.

Hello, thank you for writing in. The vehicle is not getting power from the battery for one reason or another. There are several things that you can check. One being the battery cables. Make sure they are clean, dry, and...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...
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.