Posting for posterity.

2007 XK, 30K miles

This week I experienced very slow crank on start, followed by the following faults at various points in the driver information console:

Cruise Not Available
Tire Pressure System Fault

When I had the "Cruise Not Available" fault displayed, the car behaved very sluggishly - slow acceleration combined with heavy steering. When I would shut off the car and start it back up, sometimes the faults went away, sometimes they didn't.

The dealer is pointing to a faulty battery (claimed it failed a battery test) and low voltage resulted in faults being tripped throughout car. The battery was then replaced under warranty (thank you CPO program!).

 

thats crazy my 07 xkr is in the shop right now, it did the exact same thing started sluggish, so they told me to change the battery, i did, and the cruise not available went away, but the faulty tire pressure light stayed on. let me know what happen and if you had gotten fixed

 

What psi trips the tire pressure light?

 

had to replace the tire pressure module

 

I am also getting the tire pressure system fault warning just about every morning. Seems to go away when the car is warmer?? When I get in the car to go to lunch I don't get the warning. Next morning, there it is again. I've had no issues with starting sluggish, but I have had two episodes where my cruise was unavailable due to my radar being blocked.

2007 XKR Coupe with 31,900 mi. I've owned it about 7 weeks and have put about 2000 mi on it.

Tim