Spent the day stranded with my first ever issue with my 2015 F-Type V8S. Installed a new battery roadhouse to no avail (old battery tester good) courtesy of an expensive Uber ride. Brake pedal is hard as a rock so working theory now is brake pedal sensor. Towed to shop. Any guesses from the group?

 

It is normal for vacuum-assisted power brakes to feel immobile/immovable when the engine is off, after the first pedal 'pump'. My first impulse is to direct your investigation of the No-Start elsewhere.

Does the starter operate at all? Or does the engine turn over, but not 'fire'?

 

On my car, if I press the start button without depressing the brake pedal, the ignition comes on in accessory mode, and there's a message in the message center 'Depress Brake Pedal to Start' (something like that). If you get that message, then it doesn't think you're pressing the brake pedal.

 

Actually, that's a good first question. @David Meier Can you get into accessory mode?

 

Yes, radio, windows and everything looks normal. The Key FOB works properly as well.

 

It would appear you were on to something... Just got a call. Two issues - One, the secondary battery is dead and the car is throwing dozens of codes (I thought you could live without that battery -Yes/No?). And, Two, the starter is bad. Shop works on a lot of Jaguars and claims it's the first time they can ever remember seeing a bad starter on this model. I called the dealer and asked the parts guy how often they sell F-Type starters and he said "almost never".

 

Correct, you can disconnect or even remove the secondary battery without issue (at least on earlier models). It's very likely throwing all those codes because you asked the ECU to start the engine, and it tried, but the engine isn't responding as the ECU is expecting.

 

Yep, I am one of those who have removed the secondary battery (one or two years ago) and zero problems.