My 2013 XF 3.0 AWD flashes every error code (Park Brake Fault, Gearbox Fault, Tire Pressure System Fault, ABS Fault, Disc Not Available, Engine Temp Indicator Fault, EBD Fault, etc.) and the car will not start when the engine is hot. After letting the vehicle sit for 30 minutes or so, it typically starts fine and with no faults. This also only seems to occur in hot weather (high air temperature). The car is located in Wisconsin, and had no issues over the winter. A new battery did not solve the problem. Any ideas as to what might be causing the problem and potential fixes?

 

The attached is a video of the faults.

 

No attachment let alone video that I can see, but I would check the battery connections (both terminals) and the earth wire connection (floor of the trunk) as it sounds like one of those may be a bit loose.

 

Thanks for the idea. I'm having issues with the video, perhaps too large. I will double check the connections, but would you expect a loose connection to only be an issue when the engine is hot and the ambient temperature is high? I have never experienced the problem with a cold engine or an air temperature under 70 F. As further context, my dealer's attempt to solve the issue was to install a new battery. Now that the outside temperatures are warming up (a bit), the problem has resurfaced.

 

I had this issue with my Porsche. Started fine when cold but not when hot.

Turned out to be the crank shaft position Sensor, however a faulty engine temperature sensor (On Porsche) can cause the same starting issues when hot

I was also advised that faulty or failing coil packs can have the same effect and may or may not show a fault during diagnostics, unsure if your car is Diesel or Petrol?

 

Thank you, Cessna! The vehicle is petrol (gasoline). I read on a different thread about a different vehicle with similar symptoms and the coolant temperature sensor ended up being the issue. I think I will start with the temperature sensors and see if that solves the problem. Thanks again!