: Use a JLR-approved diagnostic tool to clear the DTCs. If the code does not return immediately after a test drive, it was likely a transient voltage issue.

The Land Rover fault code specifically indicates an "Engine Speed Input - Circuit Short to Ground" within the Audio Amplifier Module (AAM) . While seeing an engine-related code in an audio module might seem alarming, this DTC is generally regarded as a "ghost code" that does not typically affect the vehicle's drivability or even the primary functions of the infotainment system. What Does B1D9F-11 Mean?

: This code rarely triggers a Check Engine Light (CEL) or a "restricted performance" warning.

: Less commonly, the audio amplifier itself may have an internal fault that prevents it from correctly processing the engine speed signal.

If you encounter this code, specialized technicians from Land Rover service centers generally recommend the following:

: A mismatch in the "Power Mode" configuration sent from the infotainment master controller can sometimes lead to this fault. Recommended Diagnostic Steps

: It is often only discovered during a routine diagnostic scan using tools like an IID tool or JLR-approved SDD/Pathfinder software.

: If the code persists, refer to electrical circuit diagrams to test the crank signal input circuit for high resistance or a physical short to the chassis.

: A sub-type identifier indicating a short to ground . (Alternatively, a -13 suffix would indicate an open circuit). Common Symptoms