Battery flat , immobilizer wont switch off.

Hello, today i discovered that my battery was flat in my 2012 puma (left an interior light on). I had a jump start and the engine eventually started with the alarm sounding. The alarm stopped and i drove to charge the battery. I turned the engine off after 30 mins to find that the key fob was inactive and the alarm started to sound. The immobilizer cut the engine off after 1 second when i started the engine. Ive followed steps to re sync the fob, disconnecting the battery and pressing the lock button on the fob 4 times. Sadly this hasnt made a difference. Can anyone shed some light on the problem.?

Many thanks
Simon

are you or your passengers in danger?
Is the car safe and secure?

Aware.

Unless youre in need of urgent physical assistance Ill move this to the Defender section where you'll hopefully get accurate advice quicker

blue beasty said:

Unless youre in need of urgent physical assistance Ill move this to the Defender section where you'll hopefully get accurate advice quicker

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saves having to red button it

Black Stone said:

disconnecting the battery

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Are you following the correct battery disconnect procedure? Also if you are on the original car battery it might be worn out - mine died at approx 5 years old (2012 puma same as yours). A battery voltage check will tell you. If car battery is good, try changing the battery in the fob (again follow the correct procedure). Procedures can be found in the owners handbook.

sorry , yes this is in the wrong section.

Black Stone said:

pressing the lock button on the fob 4 times.

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Needs to be pressed at least 4 times, sometimes takes a couple more to re-synch. You will know it has re-synched if the car doors lock on the last press.

Wimblowdriver said:

Are you following the correct battery disconnect procedure? Also if you are on the original car battery it might be worn out - mine died at approx 5 years old (2012 puma same as yours). A battery voltage check will tell you. If car battery is good, try changing the battery in the fob (again follow the correct procedure). Procedures can be found in the owners handbook.

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cheers mate.. I accidentally drained the battery , it was alive with a jump.

Black Stone said:

cheers mate.. I accidentally drained the battery , it was alive with a jump.

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I dont know much of modern electrics but do know some ECGs dont perform well if at all at low voltage. I doubt half an hours run would charge up the battery enough. Try an overnight charge and try again.

Bobsticle said:

I dont know much of modern electrics but do know some ECGs dont perform well if at all at low voltage. I doubt half an hours run would charge up the battery enough. Try an overnight charge and try again.

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Thats correct. With the puma, if the battery is under 12.5 volts it needs to be removed from the vehicle and recharging. But the disconnect procedure must be followed. It can / will start at slightly lower voltages but strange things can happen, like the alarm sounding on start-up. After recharging and refitting the battery, the fob has to be resynchronised (and have a good battery) and then the vehicle needs a few miles of driving to reset some functions. During this time the fault light will be on, but after the initial few miles it will go out on the next start-up. If any of these stages is omitted, or the battery voltage is low, you will have problems. It is all about following the full procedure.