Replacing the faulty sensor is a straightforward task that many owners can complete at home.
that the Ride Level Control Module (integrated into or connected to the valve block) has performed a self-test and detected an internal plausibility error in the solenoid driver stage. This is not a mechanical leak or external wiring short. Common causes:
The following part numbers are confirmed to be correct for the B13C2-49 sensor: land rover jaguar b13c2-49
Because the sensor regulates humidity by cycling the air conditioning, a failed unit can cause the A/C compressor to either run continuously or fail to engage when needed.
Use a Jaguar Land Rover (JLR) diagnostic tool (like SDD or Pathfinder) to clear the code. If it returns immediately, the fault is active. Check Power and Ground: Replacing the faulty sensor is a straightforward task
Temporarily – but the self-test will run again within 10 minutes of driving, and the code will return if the fault is hardware-related.
If diagnostics point to the sensor, replacement is your best bet. The process is straightforward for a DIYer with moderate skills. Based on owner experiences, here's how to do it: Common causes: The following part numbers are confirmed
Disclaimer: This article is for informational purposes. Always refer to your vehicle’s official service manual and consult a qualified technician for repairs. Part numbers and TSB references may change. Last updated: March 2025.
If the sensor fails internally (that’s the “-49” suffix, meaning “internal electronic failure”), the car gets confused. As a result: