Subaru Problems? Ask a Mechanic for Answers ASAP
Is the engine cranking and not starting or no cranking at all?
Here is what is the likely issue. The alternator has probably stopped charging. So, this would turn on your brake light and usually the battery light at the same time. Either it's stopped charging or the battery will not hold the charge. I would go with the jump start again. Let the donor car sit on it for about 15 minutes, then try to start it. Even if it doesn't start, if the engine cranks it's improvement and you know you have to start with the battery. Then, if you can drive it, take it to a parts store and have the charging system and battery tested. At this point I do not believe the immobilizer is the issue at all, but you are dealing with a weak or dead battery and possibly an issue with the alternator.
Please let me know what more I can do to assist you today. Also, please remember to rate my answer, Just Answer does not compensate me for my time and resources. Follow up questions are included in the price of your question. If you are using the free trial, a rating is still required.Thank you so much!
Low voltage will do that. The systems need at least 12 volts, if the battery only has 10 volts in it, your electronics will act strangely. This could also be why the brake and traction control lights were on as you were driving the car. You may have an alternator that is under charging and simply not putting enough out, so the car is using the battery up at the same time.
The immobilizer and security isn't going to make the gauges to this.
Thought I would check in and see how you made out?
So I was right about it being the battery, although it was the terminals, had you tried to jump start the car you likely would have seen it was loose.
Glad to hear it was repaired and you are back to up and running.
Please be kind enough to rate my answer, thanks so much.