Possible Causes
WARNING: This page is about a different car, the 2017 Jaguar XJ, 2016 Jaguar XJ, 2015 Jaguar XJ, 2014 Jaguar XJ, and 2013 Jaguar XJ. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Monitor description
. The powertrain control module checks there is brake vacuum greater than 60 kPa gauge pressure after 45 seconds. After engine is running, the atmospheric pressure is greater than 75 kPa, the coolant is greater than 20°C, and the brake pedal is released.
- Brake vacuum sensor open circuit, high resistance
- Connector is disconnected, connector pin is backed out, connector pin corrosion
- Brake vacuum pump air leakage
- Brake vacuum pump failure