Unlike a -87 sub-code (which indicates a missing communication message or an open LIN bus circuit), the -49 fault indicates that the HVAC module is still communicating with the sensor, but the internal micro-circuitry of the sensor itself has broken down or burned out. In extreme failure scenarios, diagnostic live data streams on tools like JLR SDD or PATHFINDER may read impossible parameters, such as a windscreen temperature locked at a default value of . Core Causes of Fault Code B13C2-49
is the sub-type failure matrix indicator, explicitly meaning Internal Electronic Failure . land rover jaguar b13c2-49
This means the diagnostic system has detected that the sensor's internal circuitry is faulty. The other most common subtype you might encounter is or B13C2-86 , which usually points to a "Missing Message" or a "LIN circuit" fault, indicating a potential wiring or communication issue between the sensor and the main computer. Unlike a -87 sub-code (which indicates a missing
Technicians at JLR dealerships see this code frequently. After thousands of repair orders, three primary root causes have emerged. Note that replacing the battery will almost never fix this code, despite what some forum posts claim. This means the diagnostic system has detected that
If the mounting is fine, the sensor is likely dead. You can find this part using these common part numbers: Land Rover: LR058011 or LR025888
The auto-defrost system does not turn on automatically.